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Masonry

Masonry is the craft and technique of constructing buildings, walls, and other structures from individual units such as bricks, stones, concrete blocks, or clay products, which are typically laid in and bound together by mortar or other adhesives to form a composite material capable of withstanding compressive loads.^[1]^[2] This method has been a cornerstone of architecture for millennia, valued for its durability, fire resistance, and aesthetic versatility in creating load-bearing walls, veneers, and decorative elements.^[3]^[4] The history of masonry dates back to ancient civilizations, where it was used to erect monumental structures like the pyramids of Egypt and the stone temples of Mesopotamia around 3000 BCE, relying on massive blocks fitted without mortar in early dry-stone techniques.^[5] By the Roman era, advancements in mortar—particularly the invention of lime-based and later pozzolanic concretes—enabled more sophisticated constructions, including arches, vaults, and domes that exemplified masonry's structural ingenuity.^[6] In medieval Europe, brick and stone masonry proliferated for cathedrals and castles, while the Industrial Revolution in the 19th century introduced mass-produced clay bricks and concrete blocks, expanding its application to urban housing and infrastructure.^[7] Today, masonry remains integral to sustainable building practices due to its thermal mass properties, which help regulate indoor temperatures, and its longevity, often exceeding centuries with proper maintenance.^[8]^[9] Masonry construction encompasses several distinct types, each suited to specific structural and environmental needs. Brick masonry, one of the most common forms, involves fired clay units laid in running bond patterns for walls and facades, offering high compressive strength and resistance to weathering.^[10] Stone masonry includes rubble (undressed stones) for rustic retaining walls or ashlar (precisely cut stones) for refined architectural features, prized for its natural beauty and load-bearing capacity in historic and modern designs.^[11] Concrete masonry units (CMUs), such as hollow blocks, provide versatility for non-load-bearing partitions and insulated walls, often reinforced with steel for seismic resilience.^[12] Other variants include glass block for translucent panels and refractory brick for high-heat applications like fireplaces.^[2] The choice of type depends on factors like climate, budget, and aesthetics, with masons employing tools such as trowels, levels, and plumb lines to ensure alignment and stability during assembly.^[3] In contemporary building, masonry's importance lies in its contribution to energy-efficient, resilient structures that minimize environmental impact through recyclable materials and low embodied energy compared to steel frames.^[13] It provides sound insulation and protection against pests and fire, while innovations like thin brick veneers and autoclaved aerated concrete expand its role in green architecture.^[4] However, challenges such as moisture infiltration and the need for skilled labor underscore the importance of adherence to building codes and preservation standards to maintain its integrity over time.^[14]

History

Ancient Origins

The earliest evidence of masonry appears in prehistoric Europe during the Neolithic period, where communities constructed dry-stone walls without mortar, relying on carefully selected and stacked stones for stability. In Scotland's Orkney Islands, the site of Skara Brae exemplifies this technique, featuring sophisticated dry-stone structures dating to approximately 3100–2500 BCE that formed the walls of clustered stone houses, demonstrating early load-bearing principles through interlocking rubble and shaped slabs. These constructions evolved from simpler rubble piles, showcasing an initial shift toward more precise stone placement to support roofs and enclosures in communal settlements.^[5]^[15] In ancient Egypt, masonry advanced significantly around 2700 BCE with the construction of the pyramids during the Old Kingdom, utilizing massive limestone blocks quarried from nearby sites like the Giza plateau and transported via sledges lubricated with water. Workers employed copper chisels and wooden mallets to extract and shape the blocks, which were then bonded using mud mortar or gypsum in basic coursing patterns to create stable, load-bearing superstructures such as the Step Pyramid of Djoser. Mudbricks, formed from Nile silt and sun-dried, supplemented stone in ramps, internal cores, and subsidiary structures, highlighting an evolution from irregular rubble fills in predynastic tombs to precisely cut ashlar facings that distributed weight vertically without reinforcement. This approach not only supported immense compressive loads but also reflected cultural priorities of permanence and divine symbolism in funerary architecture.^[16]^[17]^[18] Mesopotamian civilizations further refined masonry by 2100 BCE, as seen in the ziggurats of Sumer, where fired bricks—kiln-baked for durability—were laid with bitumen as a waterproof mortar to form towering, stepped platforms like the Ziggurat of Ur built under King Ur-Nammu. These structures transitioned from earlier mudbrick rubble cores to organized courses of standardized bricks, emphasizing horizontal bonding and inclined planes to manage seismic loads and heavy superstructures in the alluvial plains. The use of bitumen, a natural asphalt, enhanced adhesion and weather resistance, marking a conceptual leap in load-bearing design that prioritized vertical stability through mass and geometric form over tensile strength.^[19]^[20] Overall, ancient masonry's development from loose rubble aggregates to dressed cut stones across these regions established foundational load-bearing principles, where compressive strength of materials like limestone and fired clay sustained monumental architecture without metal reinforcements, laying the groundwork for subsequent mortar innovations.^[5]

Medieval and Renaissance Developments

In the medieval period, masonry techniques advanced across Europe and the Middle East, building on ancient stone-cutting methods to support larger and more ambitious structures. Romanesque architecture, prevalent from the 10th to 12th centuries, relied heavily on ashlar masonry—precisely cut square stones laid in regular courses with lime-based mortar for bonding and stability.^[21]^[22] This approach was evident in early cathedrals, where thick walls of ashlar stone distributed loads effectively, though limited by rounded arches and barrel vaults that constrained height and interior light. The shift to Gothic architecture in the 12th century marked a pivotal refinement, introducing pointed arches, ribbed vaults, and flying buttresses to enable soaring interiors and expansive windows. Construction of Notre-Dame Cathedral in Paris began in 1163 under Bishop Maurice de Sully, incorporating pointed arches that directed weight more vertically, reducing outward thrust on walls built from ashlar limestone joined with lime mortar.^[23]^[24] Ribbed vaults, which used diagonal stone ribs to support vaulted ceilings while filling panels with lighter materials, first appeared fully in England at Durham Cathedral around 1133, allowing for higher naves and complex geometric designs.^[25] Flying buttresses, external arched supports that transferred lateral forces from vaults to the ground, further stabilized these innovations, as seen in later Gothic examples like Notre-Dame, where they permitted thinner walls and larger stained-glass areas.^[26] Parallel developments in Islamic architecture emphasized decorative and structural intricacy, particularly in brick masonry. The Alhambra palace complex in Granada, constructed under the Nasrid dynasty in the 14th century, showcased muqarnas—honeycomb-like vaulting elements often formed in stucco over brick cores—and tall minarets built with finely laid brickwork for both load-bearing and ornamental purposes.^[27] These techniques highlighted regional expertise in bonding bricks with lime mortar to create intricate patterns and transitional zones between walls and domes, influencing stylistic exchanges with European builders. Regional variations in mortar composition reflected local resources and climates, with northern European masons often using high-lime-content mixes for flexibility in cold weather, while southern regions incorporated pozzolanic additives for hydraulic properties.^[28]^[29] In Sweden, medieval mortars typically featured elevated binder ratios to enhance durability against moisture.^[29] The Renaissance in 15th-century Italy revived classical principles, integrating them with medieval masonry to emphasize proportion and symmetry. Filippo Brunelleschi's dome for Florence Cathedral, completed in 1436, represented this synthesis: a massive unreinforced masonry structure of brick and stone, self-supporting through interlocking herringbone patterns and octagonal ribs, while drawing on Roman orders like Corinthian columns for its base and lantern.^[30]^[31] This engineering feat not only resolved the challenge of spanning a 138-foot-wide octagon without scaffolding but also reintroduced classical elements, such as pilasters and entablatures, into masonry design to evoke antiquity's grandeur.^[32]

Industrial and Modern Advances

The Industrial Revolution catalyzed the mechanization of masonry production in the 19th century, with the establishment of large-scale brick factories equipped with steam-powered kilns that enabled unprecedented mass production. Prior to this, brickmaking relied on labor-intensive hand-molding and clamp kilns, but innovations like steam-driven pug mills and continuous Hoffman kilns, introduced around 1858, automated mixing and firing processes, dramatically increasing output and uniformity.^[33]^[34] By the mid-1800s, these factories in regions like the Hudson Valley and Philadelphia produced millions of standardized bricks annually, supporting rapid urbanization and infrastructure projects across Europe and North America.^[35] The development of Portland cement in 1824 by British bricklayer Joseph Aspdin further transformed masonry by creating a hydraulic binder that set underwater and achieved greater strength than lime-based mortars, fundamentally enhancing mortar durability and structural integrity.^[36] This advancement paved the way for reinforced masonry systems, where steel bars embedded in cement grout improved tensile strength, allowing masonry to compete with emerging steel-frame construction in high-rise buildings. A prime example is Chicago's Monadnock Building, completed in 1891, which reached 16 stories as the tallest load-bearing masonry structure ever built, its massive brick walls—up to 6 feet thick at the base—demonstrating the limits of cement-enhanced unreinforced masonry before full reinforcement became standard.^[37]^[38] Post-World War II reconstruction demands propelled concrete blocks to widespread popularity, with production surging to over 1.6 billion units annually in the United States by the 1950s due to their low cost, fire resistance, and versatility for housing and commercial projects.^[39] Seismic events, including the 1971 San Fernando earthquake that exposed vulnerabilities in unreinforced masonry, prompted the integration of retrofitting techniques into building codes during the 1970s, such as adding steel ties, shear walls, and foundation bolting to improve ductility and prevent collapse.^[40] These Uniform Building Code updates mandated evaluations for pre-1970s structures, significantly reducing risks in earthquake-prone areas like California.^[41] In the late 20th and early 21st centuries, masonry evolved through prefabrication, where factory-assembled panels and veneers minimized on-site labor and accelerated assembly, a practice originating in post-war efficiency drives and now standard for modular construction.^[42] Automation in concrete block molding advanced with programmable logic controller (PLC)-driven machines that integrate batching, vibration, and stacking, boosting production rates to thousands of units per day while ensuring precision.^[43] In the 2020s, advancements in 3D printing and robotics have begun to automate masonry assembly, enhancing precision, productivity, and addressing labor shortages.^[44] Sustainability initiatives, particularly from 2020 onward, have emphasized recycled aggregates, such as crushed concrete from demolition waste, in masonry units to lower virgin material use and carbon emissions, with market projections estimating the global recycled concrete aggregates sector to reach approximately USD 17.4 billion by 2028 (as of 2024 estimates) amid regulatory pushes for green building.^[45]^[46]

Materials

Natural Stone

Natural stone serves as one of the oldest and most enduring materials in masonry, prized for its inherent strength, thermal mass, and visual diversity derived from geological processes. Formed through natural forces over millions of years, it is broadly classified into three categories: igneous, sedimentary, and metamorphic rocks, each contributing distinct characteristics to construction applications. These stones are selected based on factors such as load-bearing capacity, aesthetic qualities, and environmental suitability, ensuring their integration into walls, facades, and structural elements. Igneous rocks, originating from cooled and solidified magma or lava, include granite and basalt, which are renowned for their exceptional durability and resistance to compression. Granite, for instance, typically exhibits a compressive strength ranging from 100 to 250 MPa, enabling its use in high-stress structural components like foundations and columns. Basalt shares similar toughness but is denser and often employed in paving or heavy-duty applications due to its fine-grained texture.^[47]^[48] Sedimentary rocks, such as limestone and sandstone, form from the accumulation and compaction of mineral particles or organic remains, resulting in layered structures that can vary widely in hardness. Limestone, primarily composed of calcium carbonate, offers compressive strengths between 30 and 250 MPa depending on its density, with softer varieties used for ornamental work and denser ones for robust masonry. Sandstone, cemented from sand grains, provides strengths of 20 to 170 MPa and is valued for its workability and natural bedding planes that influence cutting and laying.^[49] Metamorphic rocks arise from the alteration of pre-existing stones under intense heat and pressure, yielding materials like marble and slate with enhanced uniformity. Marble, recrystallized limestone, achieves compressive strengths of 70 to 140 MPa and is favored for its ability to take a high polish, making it suitable for fine veneers and decorative elements. Slate, formed from shale, delivers 100 to 200 MPa in compression and excels in thin, weather-resistant cladding due to its cleavage properties. Sourcing natural stone begins with quarrying, where large blocks are extracted from open-pit or underground sites using specialized techniques tailored to the rock type. For hard igneous stones like granite, controlled blasting with explosives loosens the material, followed by mechanical wedging or hydraulic splitting to produce initial blocks. Softer sedimentary stones such as limestone are often quarried via channeling with diamond wire saws or broaching machines to achieve clean cuts with minimal fracturing. Metamorphic marbles require precise methods like overhead gantry saws to preserve surface quality during extraction. These processes ensure blocks of sufficient size—typically 2 to 3 meters in length—for subsequent processing, while minimizing waste and environmental impact.^[50]^[51] Preparation, or dressing, transforms raw quarry blocks into usable masonry units through cutting, shaping, and finishing to meet project specifications. Ashlar masonry demands high-precision dressing, where stones are sawn into rectangular prisms using gang saws or waterjets, then hand-tooled or machine-planed for smooth faces and edges, achieving uniform thicknesses often between 5 and 15 cm. In contrast, rubble masonry involves coarser dressing, with stones split by plugging and feathering—inserting metal wedges into drilled holes—or lightly hammer-dressed to remove sharp edges while retaining irregular forms for cost-effective, rustic walls. These techniques balance structural integrity with aesthetic intent, with ashlar providing sleek, modular appearances and rubble offering a textured, organic look.^[52]^[53] Historical and regional examples highlight the evolution of stone preparation techniques. In ancient Egypt, limestone from Tura quarries was extracted using copper chisels and dolerite pounders, then roughly dressed into massive blocks for pyramid cores, with finer surface dressing applied using abrasive sands for casing stones. Greek masons prepared Pentelic marble through careful quarrying with iron tools and anathyrosis—a fitting technique involving recessed and projecting surfaces—to ensure precise, mortarless joints in structures like the Parthenon, emphasizing the stone's translucency and fine grain. These methods underscore a focus on material-specific handling to enhance longevity and precision.^[54]^[55] Key concepts in natural stone masonry include dimensional tolerances, which for ashlar work typically limit variations to ±3 mm per linear meter to facilitate even bedding and alignment. Weathering resistance varies by stone type; granite's low porosity (under 1%) confers excellent durability against freeze-thaw cycles and acid rain, while limestone's higher absorption (up to 15%) may necessitate sealants in harsh climates to prevent dissolution. Stone-specific bonding challenges arise from surface characteristics—smooth marble or dense granite can resist mortar adhesion, requiring mechanical keying through roughening or the use of polymer-modified mortars to achieve shear strengths exceeding 1 MPa. Natural stone can also be adapted for dry-stack methods, where interlocked units rely on precise dressing for stability without adhesives.^[50]^[56]

Clay Bricks

Clay bricks are modular masonry units produced by shaping and firing clay or shale, offering durability, fire resistance, and aesthetic versatility in construction. These bricks are formed from natural clays that undergo plastic deformation, drying, and high-temperature firing to achieve vitrification, resulting in a hard, impermeable material suitable for both structural and decorative applications. Unlike natural stone, clay bricks provide consistent dimensions, typically around 8 x 4 x 2.25 inches (nominal), enabling precise modular assembly.^[57]^[58] The manufacturing process begins with mining and preparing clay, which is crushed, screened, and mixed with water to achieve plasticity. Bricks are then formed through three primary methods: extrusion, where stiff mud is forced through a die to create a continuous column that is cut into units; soft-mud molding, involving pressing semi-plastic clay into sand-lubricated molds either by hand or machine; and dry-pressing, which compacts low-plasticity clay at high pressure for denser products. Following forming, bricks are dried to remove moisture, preventing cracking during firing, and then fired in kilns at temperatures between 900°C and 1200°C to induce vitrification, where the clay partially melts and fuses into a glassy matrix for strength and weather resistance.^[57]^[58]^[59] Clay bricks are classified into types based on intended use and performance standards. Common bricks, also known as building bricks, are solid units used in concealed or non-facing applications, meeting ASTM C62 specifications that limit 5-hour boiling water absorption to under 17% for severe weathering exposure (Grade SW) to ensure durability against freeze-thaw cycles. Facing bricks, governed by ASTM C216, prioritize appearance with textured or colored surfaces for visible exteriors, while maintaining absorption limits similar to common bricks. Firebricks, made from refractory clays high in alumina and silica, withstand temperatures up to 1600°C and are specified under standards like ASTM C27 for applications in fireplaces and kilns.^[60] Variations in clay bricks range from uniform machine-produced units to rustic handmade ones, influencing both aesthetics and construction possibilities. Machine-pressed or extruded bricks exhibit high uniformity in size, shape, and color due to automated processes, ideal for modern, straight-line layouts. In contrast, handmade bricks, formed in molds with subtle irregularities, provide a rustic texture and varied coloration, evoking traditional craftsmanship. These irregular bricks enable serpentine masonry patterns, where curved brick layouts form arches or undulating walls, adding architectural interest without additional cutting.^[57]^[61] Key properties of clay bricks include controlled thermal expansion and measures to prevent efflorescence. The coefficient of linear thermal expansion for most clay bricks falls between $5 \times 10^{-6} and $7 \times 10^{-6} per °C, allowing compatibility with other building materials while minimizing cracking from temperature changes. Efflorescence, the white salt deposits from soluble salts leaching to the surface via moisture, is prevented in clay bricks by selecting low-soluble salt clays during manufacturing, applying insoluble chemical additives to bind potential salts, and ensuring proper drying and storage to avoid initial water absorption.^[62]^[63]

Concrete Blocks and Units

Concrete masonry units (CMUs), commonly known as concrete blocks, are precast building components made primarily from Portland cement, aggregates such as sand or gravel, and water, offering a versatile alternative to traditional stone or clay masonry in modern construction. These units are produced through a controlled manufacturing process that ensures uniformity, strength, and dimensional accuracy, making them suitable for load-bearing walls, partitions, and foundations. Unlike natural stone, CMUs are factory-made for cost-efficiency and scalability, while differing from clay bricks by their cement-based composition that allows for hollow designs and customization.^[64] The production of concrete blocks begins with mixing Portland cement, fine and coarse aggregates, and water in precise proportions to form a workable concrete batch, often with admixtures for enhanced workability or durability. This mixture is then compacted into molds using vibration or hydraulic pressure to remove air voids and achieve dense packing, forming either solid or hollow units. Curing follows, typically in controlled environments like steam chambers or autoclaves for accelerated hydration; for instance, autoclaved aerated concrete (AAC) involves adding aluminum powder to generate gas bubbles, creating a lightweight, porous structure cured under high-pressure steam at temperatures exceeding 180°C (356°F) to achieve densities as low as 300-800 kg/m³. This process results in units ready for use within hours to days, contrasting with the longer firing times for clay products.^[65]^[66] Concrete blocks are classified by weight and configuration, including solid units with no voids, hollow-core types where cores occupy 25-75% of the face area for weight reduction, and lightweight variants using expanded aggregates or AAC to achieve densities between 500-2000 kg/m³. Standards such as ASTM C90 govern loadbearing CMUs, requiring a minimum compressive strength of 13.1 MPa (1900 psi) based on net area for both hollow and solid units, ensuring they meet structural demands in residential and commercial applications. These specifications also categorize units by density: lightweight (≤1680 kg/m³), medium weight (1680-2240 kg/m³), and normal weight (>2240 kg/m³), with hollow designs facilitating easier handling and installation.^[67]^[68] A key advantage of concrete blocks lies in their thermal insulation properties, enhanced by integrated voids that trap air or accommodate insulating materials like foam or fiberglass, providing a basic R-value of approximately 0.2 to 0.25 per inch for unfilled units, which can be significantly improved by filling the voids with insulation. Precast hollow units allow for on-site filling with insulation during construction, improving energy efficiency in walls while maintaining structural integrity. For seismic performance, the ductility of concrete masonry can be enhanced by placing reinforcement bars in the hollow cores, which dissipates energy during earthquakes and reduces brittle failure risks.^[69]^[70]^[71] Critical performance metrics include limits on water absorption to prevent moisture-related degradation, with ASTM C90 specifying maximums of 288 kg/m³ (18 lb/ft³) for lightweight units, 240 kg/m³ (15 lb/ft³) for medium-weight, and 208 kg/m³ (13 lb/ft³) for normal-weight, tested via submersion methods to ensure freeze-thaw resistance in exterior applications. These controls, combined with low absorption rates under 13% by weight in some formulations, contribute to long-term durability in varied climates.^[68]^[72]

Construction Techniques

Mortared Assembly

Mortared assembly is the primary technique in masonry construction for bonding individual units, such as bricks or blocks, using mortar to create a composite structure with enhanced load-bearing capacity and weather resistance. This method relies on the mortar's ability to fill joints, providing adhesion between units while distributing loads evenly. The process ensures structural integrity by forming a monolithic wall or assembly that can withstand compressive forces, shear, and environmental exposure.^[73] Mortar types are classified under ASTM C270, which specifies property requirements for masonry mortars based on compressive strength and composition. Common types include cement-lime mortars, which combine Portland cement, hydrated lime, and sand for balanced workability and strength; lime-only mortars, using hydraulic or non-hydraulic lime with sand for historic or restoration work where flexibility is prioritized; and polymer-modified mortars, which incorporate acrylic or latex polymers to improve adhesion and flexibility in demanding applications. For cement-lime mortars, mix ratios vary by type: Type N uses a 1:1:6 ratio of cement, lime, and sand, achieving a minimum average compressive strength of 750 psi (5.2 MPa), suitable for general above-grade use. Type S employs a 1:0.5:4.5 ratio, providing 1,800 psi (12.4 MPa) for load-bearing or below-grade applications. These proportions ensure adequate bonding while controlling workability.^[74]^[73]^[75] Application of mortar involves spreading it as a bedding layer, typically 3/8 to 1/2 inch thick, on the unit below to support the next layer, followed by filling vertical joints for complete encasement. Joint tooling, performed after initial set, shapes the mortar surface—concave or V-shaped profiles are preferred for weather resistance, as they direct water away from the joint interface and reduce water penetration by up to 50% compared to flush joints. Bond patterns influence assembly stability: running bond, with units offset by half their length, promotes interlocking and shear resistance, while stack bond aligns units vertically for aesthetic uniformity but requires reinforcement for structural use. These techniques are often applied with clay bricks to form durable walls.^[73]^[74]^[76] Curing is essential for mortar to develop full strength through hydration, typically involving moist curing by misting or covering with wet burlap for 7 to 28 days to maintain humidity above 80% and prevent rapid drying. This process allows Portland cement in cement-lime mortars to achieve design compressive strengths, such as 1,800 psi (12.4 MPa) for Type S, with 60% strength reached in the first 24 hours and full strength by 28 days. Inadequate curing can reduce bond strength by 20-30%.^[77]^[76]^[78] Adhesion mechanics in mortared assembly depend on chemical bonding via cement hydration and mechanical interlock from mortar penetration into unit pores, with bond strength tested per ASTM C1324 exceeding 50 psi (0.34 MPa) for reliable performance. Shrinkage control is critical to prevent cracking, achieved by using lime to reduce drying shrinkage to under 0.03% and incorporating polymers in modified mortars to enhance tensile strain capacity; proper water-cement ratios (below 0.5) and gradual curing minimize autogenous and drying shrinkage, limiting crack widths to less than 1/16 inch.^[76]^[74]^[75]

Dry-Stack Methods

Dry-stack methods in masonry involve assembling stones or blocks without mortar, relying instead on precise interlocking shapes, gravity, and frictional forces for stability. These techniques create structures that are permeable, allowing drainage, and are particularly suited to environments where flexibility under load is beneficial, such as seismic zones or areas prone to soil movement. Unlike mortared systems, dry-stack assemblies derive strength from the self-weight of the units and their geometric configuration, with no reliance on adhesive bonding.^[79] Historical examples of dry-stack methods include the polygonal masonry employed by the Inca civilization in structures like the walls of Sacsayhuamán, where large stones were cut to irregular, convex polygonal shapes that interlock tightly. These stones, often weighing several tons, were fitted with such precision that joints measure less than 1 mm in width, enabling the walls to withstand earthquakes through energy dissipation via block sliding and rocking. The technique emphasized careful selection and shaping of andesite or granite blocks to ensure mutual support without gaps.^[80]^[81] In modern applications, dry-stack methods are used for retaining walls and erosion control, where stability is achieved through battering—the inward slope of the wall face. A common batter angle is 1:6 (one unit horizontal to six units vertical), which counters overturning forces by widening the base relative to the height, allowing walls up to several meters tall to resist lateral earth pressures. For erosion control, gabion baskets—wire mesh containers filled with loose stones—function as a form of dry-stack system, dissipating water energy along riverbanks or slopes while permitting sediment deposition. These baskets, typically 1-2 m in dimension, are stacked and interlocked to form permeable barriers that reduce flow velocity and prevent scour.^[82] The stability of dry-stack structures depends on frictional resistance at interfaces, with coefficients typically ranging from 0.6 to 0.8 for stone-on-stone contact, providing shear strength without tensile capacity. This friction, combined with interlocking geometries, prevents sliding, though the system has no ability to resist pulling forces, making it vulnerable to tension-induced failure. Construction requires sequential placement starting from a level foundation, building each course to be self-supporting before adding the next, often using through-stones to tie layers together. Over time, settlement or environmental shifts may cause misalignment, necessitating regular maintenance such as repacking voids or resetting displaced units to restore equilibrium.^[83]^[84]^[85]

Veneer and Facing Systems

Veneer and facing systems in masonry consist of non-structural outer layers applied to a backing wall primarily for aesthetic enhancement or weather protection, without contributing to the building's load-bearing capacity. These systems allow for the use of durable, visually appealing materials like brick or stone on substrates such as wood framing, steel studs, or concrete masonry units, while accommodating movement between the veneer and the structural backup.^[86]^[87] The two primary types are anchored and adhered veneers. Anchored veneers, such as traditional brick facades, are mechanically secured to the backup wall using corrosion-resistant metal ties embedded in the mortar joints of the veneer and fastened to the substrate. These ties are typically spaced at 16 inches vertically and 24 inches horizontally, providing one anchor per approximately 2.67 square feet of wall area, in accordance with building code requirements.^[88]^[89] Adhered veneers, including thin brick strips or manufactured stone panels, are bonded directly to the prepared substrate using mortar or adhesive, eliminating the need for ties but requiring a clean, stable surface like cement board or sheathing.^[86]^[90] Installation of anchored veneers involves constructing cavity walls with a minimum 1-inch air space—recommended at 2 inches for optimal drainage—between the veneer and the water-resistive barrier on the backup wall to allow moisture to escape and prevent water accumulation. Weepholes, open joints or vents at the base of the wall just above flashings, are installed at spacings of 24 to 32 inches to facilitate drainage, often using wicks or open head joints. Flashings, made of metal or approved membranes, are integrated at the base, window sills, and other horizontal terminations to direct water outward.^[91]^[87]^[92] For adhered systems, installation follows a similar moisture management approach but emphasizes surface preparation and bond strength, with units applied in a running bond pattern over a dashed mortar bed or adhesive.^[93]^[94] Common materials for these systems include thin clay bricks, split-face concrete units, and cultured or manufactured stone, selected for their lightweight properties and aesthetic versatility compared to full-thickness masonry. Adhered manufactured stone veneer units must meet ASTM C1670 standards, which specify physical requirements such as minimum dimensions, water absorption limits, and compressive strength to ensure durability and performance.^[95]^[96] Anchored systems often use standard facing bricks compliant with ASTM C216 for severe weather exposure.^[87] To address differential movement between the veneer and backup—arising from thermal expansion, shrinkage, or structural deflection—control joints are incorporated at intervals of 20 to 30 feet, filled with backer rod and sealant to maintain flexibility without cracking. These joints align with those in the backup wall and are detailed per guidelines from the Brick Industry Association and The Masonry Society to prevent stress buildup.^[97]^[98]^[99] Proper detailing, including soft joints at changes in backing material, ensures long-term integrity while adhering to prescriptive requirements in TMS 402/602 for anchorage and support.^[99]^[86]

Structural Applications

Load-Bearing Structures

Load-bearing masonry structures primarily rely on the compressive strength of materials such as brick, stone, or concrete blocks to support vertical loads from floors, roofs, and self-weight, transmitting these forces along aligned paths through the wall assembly. In unreinforced masonry, stability depends on maintaining continuous compressive stress distribution without significant tensile forces, achieved by ensuring loads are centered and walls are adequately proportioned to prevent buckling or overturning. Design principles emphasize axial load transfer, where vertical forces follow straight or slightly curved paths downward, often requiring bond patterns like running or stack bonds to distribute stresses evenly across the wall cross-section.^[100] Wall thickness is a critical design parameter, with minimum requirements typically starting at 8 inches (203 mm) for structures over one story in height to accommodate multi-story loads while providing sufficient stability. For taller buildings, thicknesses may increase to 12 inches (305 mm) or more at the base to handle cumulative compressive forces and eccentricities from floor spans. These dimensions ensure the wall can resist both gravity and minor lateral loads without excessive deflection, as specified in empirical design provisions for low- to mid-rise applications.^[101] Historically, load-bearing masonry enabled multi-story construction before the widespread adoption of steel framing, with notable examples including the Monadnock Building in Chicago, completed in 1893, which reached 16 stories using unreinforced brick walls up to 6 feet (1.8 m) thick at the base to support its height. Pre-1900 structures like this demonstrated the limits of compressive masonry, often capped at around 12 to 16 stories in urban settings due to material weight and foundation constraints. In modern contexts, load-bearing masonry remains prevalent in low-rise buildings, such as single-family homes, schools, and small commercial facilities up to three stories, where 8- to 12-inch concrete block walls provide economical vertical support integrated with enclosure functions.^[102]^[103] Key factors influencing performance include slenderness ratios and eccentric loading effects, where the height-to-thickness ratio (h/t) is limited to less than 20 for unreinforced walls to maintain stability under compression and avoid buckling. Exceeding this ratio increases vulnerability to second-order effects, reducing load capacity by up to 50% in slender elements. Eccentric loading, arising from offset floor connections or wind-induced moments, introduces bending stresses that diminish the effective compressive area, potentially halving the wall's axial capacity if eccentricity exceeds one-third of the wall thickness.^[104]^[105]^[106] Design codes establish allowable stresses to ensure safety, typically setting the axial compressive stress at one-third of the masonry's ultimate compressive strength (f'_m) for unreinforced elements, adjusted for slenderness and eccentricity to prevent cracking or failure. This factor of safety, often around 3 to 4, accounts for material variability and construction tolerances, with f'_m values ranging from 1,500 to 3,000 psi (10.3 to 20.7 MPa) for common brick or block assemblages. While reinforcement can enhance tensile resistance in hybrid systems, unreinforced load-bearing masonry prioritizes pure compressive action for simplicity in low-seismic zones.^[107]^[108]

Non-Load-Bearing Uses

Non-load-bearing masonry finds extensive use in interior partitions, where it divides spaces without supporting structural loads, providing durability and fire resistance in commercial and residential settings.^[109] Curtain walls made from concrete masonry enclose steel or concrete frames, offering weather protection and aesthetic appeal while transferring only their self-weight and wind loads to the structure.^[110] Additionally, masonry serves as acoustic barriers, with standard 8-inch concrete masonry unit (CMU) walls achieving Sound Transmission Class (STC) ratings of 45-50, effectively reducing airborne noise such as traffic sounds from 70-80 dB to a low indoor level.^[111]^[112] Common examples include brick infill panels within steel frames, which fill openings to enhance thermal mass and visual continuity without contributing to vertical load paths.^[113] Concrete block garden walls, often constructed as freestanding elements up to 6 feet high, provide privacy, security, and ornamental screening in landscaping applications.^[114] Design considerations for non-load-bearing masonry emphasize stability against environmental forces, requiring lateral bracing at intervals not exceeding 25 times the wall thickness to resist wind loads during and after construction.^[115] Expansion joints, typically spaced every 20-25 feet in brickwork or based on material shrinkage in concrete masonry, accommodate thermal movements and prevent cracking from differential expansion.^[97]^[116] Lightweight concrete masonry units, incorporating expanded aggregates, reduce weight by up to 30% compared to standard units, facilitating easier handling and faster installation in partition and infill applications.^[117] These units integrate seamlessly with framing systems, such as cold-formed steel studs, through anchored ties that allow independent movement while maintaining alignment.^[118] Aesthetic veneers, like thin brick facings, can enhance the appearance of such non-structural elements.^[110]

Reinforced Masonry Systems

Reinforced masonry systems incorporate steel reinforcement, such as deformed bars and wire, into masonry assemblies to improve tensile strength, ductility, and resistance to lateral forces, particularly in seismic regions.^[119] These systems address the inherent limitations of unreinforced masonry by embedding reinforcement within mortar joints or grout-filled spaces, enabling the structure to handle both compressive and tensile loads effectively.^[120] Two primary types of reinforced masonry are reinforced brick masonry (RBM) and reinforced concrete masonry (RM). RBM uses clay brick units with steel reinforcement embedded in mortar or grout, commonly applied in elements like beams, columns, pilasters, and multi-wythe walls with grouted collar joints.^[121] RM employs concrete masonry units (CMU), such as hollow blocks, to house vertical and horizontal reinforcement, providing enhanced structural capacity for walls and shear elements in low- to mid-rise buildings.^[122] Grout used in these systems fills the voids around reinforcement to ensure bond and composite action, typically proportioned according to ASTM C476 with fine grout mixes consisting of one part Portland cement, up to 0.1 parts hydrated lime, and 2.25 to 3 parts aggregate by volume to achieve a minimum compressive strength of 2,000 psi (13.8 MPa).^[123] Key methods for reinforcement include vertical deformed bars placed in grouted cells of masonry units and horizontal joint reinforcement, such as ladder-type wire embedded in bed joints. Vertical reinforcement, often #5 bars spaced at 48 inches on center, is positioned in the cores of hollow units and grouted to provide axial and flexural capacity.^[110] Horizontal reinforcement, comprising welded wire trusses or ladders with side rods of at least W1.7 (0.108-inch diameter), is installed at intervals not exceeding 16 inches to control cracking and enhance shear transfer.^[124] Basic block voids in CMU facilitate this placement, allowing grout to fully encapsulate the bars for optimal bonding.^[120] These systems provide significant benefits in ductility and seismic performance, allowing masonry to deform without brittle failure under cyclic loading. Following the 1994 Northridge earthquake, which highlighted vulnerabilities in older masonry structures, building codes were updated to mandate confinement reinforcement, such as closely spaced ties or boundary elements, in high-seismic zones to improve energy dissipation and prevent collapse.^[125] Important design concepts include bar development lengths and shear wall configurations. Per TMS 402-22, the required development length of reinforcement shall be determined by Equation 6-1, but shall not be less than 12 inches (305 mm) and need not be greater than 60 d_b.^[126] Shear walls in reinforced masonry are classified as ordinary, intermediate, or special based on seismic demands, with special reinforced masonry shear walls requiring distributed vertical reinforcement at no more than 48 inches on center and horizontal reinforcement anchored around vertical bars to resist in-plane shear and out-of-plane bending.^[127]

Properties and Limitations

Mechanical Strengths and Weaknesses

Masonry exhibits high compressive strength, typically ranging from 5 to 20 MPa for brick assemblies, making it suitable for load-bearing applications where axial forces predominate.^[128] This strength arises from the robust nature of the masonry units and mortar, with values often reaching 15 MPa or higher in well-constructed prisms under perpendicular loading to the bed joints.^[129] In contrast, its tensile strength is significantly lower, generally 0.1 to 0.5 MPa, which predisposes masonry to cracking under even modest tensile stresses perpendicular or parallel to the joints.^[130] A primary weakness of masonry lies in its anisotropy, stemming from the orthogonal arrangement of units and mortar joints, which create planes of weakness particularly in shear and tension directions.^[130] Without reinforcement, masonry behaves brittleness, exhibiting sudden failure modes such as splitting or diagonal cracking rather than ductile deformation.^[131] The modulus of elasticity for masonry, approximately E = 500 to $1000 f'_m where f'_m is the prism compressive strength in MPa, further underscores this stiffness, with typical values for clay masonry around $700 f'_m and for concrete masonry around $900 f'_m.^[132] Compressive strength is evaluated through prism tests as outlined in ASTM C1314, which involves constructing representative assemblages of units and mortar, curing them under controlled conditions, and applying uniaxial load until failure to determine the net area-based strength.^[133] Flexural bond strength, a key indicator of tensile performance at the unit-mortar interface, is assessed via ASTM C1072 methods, including laboratory, field, or in-situ specimen preparation followed by three-point bending normal to the bed joints.^[134] Bed joint shear strength, typically ranging from 0.1 to 2 MPa depending on mortar type and pre-compression, governs resistance to sliding failures and is influenced heavily by the unit-mortar interface properties such as bond adhesion and surface texture.^[131] The interface acts as the critical zone for stress transfer, where mismatches in unit absorption rates or mortar workability can reduce overall shear capacity by promoting debonding or localized cracking under combined compression and shear.^[135]

Fire and Thermal Performance

Masonry materials, including brick and concrete blocks, exhibit inherent non-combustibility, making them effective barriers against fire spread in building construction. Fire resistance ratings for masonry assemblies are determined through standardized tests such as ASTM E119, which evaluate endurance under controlled fire exposure followed by a hose stream test. For instance, an 8-inch (203 mm) thick solid brick masonry wall typically achieves a 4-hour fire resistance rating, while comparable concrete masonry walls provide 2 to 4 hours depending on unit density and configuration.^[136]^[137] The thermal mass of masonry contributes significantly to its performance in regulating indoor temperatures by absorbing and slowly releasing heat. Brick masonry has a specific heat capacity of approximately 800 J/kg·K, while concrete masonry ranges from 880 to 1000 J/kg·K, enabling walls to moderate diurnal temperature fluctuations in passive building designs. Thermal conductivity for these materials generally lies between 0.5 and 2 W/m·K; clay bricks average 0.5 to 1.0 W/m·K, whereas dense concrete blocks reach up to 1.6 W/m·K, influencing heat transfer rates through the assembly.^[138]^[139]^[140] Insulated masonry cavity walls achieve U-values of 0.25 to 0.30 W/m²·K with partial-fill insulation, providing effective thermal insulation compliant with modern energy codes. In passive fire protection applications, intumescent coatings are applied to embedded steel elements within masonry to expand and insulate against heat, delaying structural failure. Concrete masonry units may experience spalling under intense fire exposure due to moisture vapor pressure buildup, potentially exposing reinforcement, though this is mitigated in low-moisture designs. Cavity walls incorporate fire-stopping barriers to restrict smoke migration, maintaining compartmentation integrity during fire events.^[141]^[142]^[143]^[144]

Durability Factors

The durability of masonry structures is significantly influenced by their resistance to environmental degradation over time, particularly through mechanisms like moisture ingress and chemical reactions that can compromise the integrity of units and mortar joints. Key factors include the material's low permeability to water, which helps prevent internal damage from cyclic wetting and drying, and the selection of appropriate mortar types to match exposure conditions. For instance, in regions prone to harsh weather, using bricks or blocks with controlled absorption rates is essential to mitigate long-term deterioration.^[145]^[63] Freeze-thaw cycles pose a major threat to masonry in cold climates, where water absorbed into porous units expands upon freezing, leading to cracking and spalling if not addressed through material selection. Resistance is achieved by limiting 24-hour cold water absorption to no more than 6% for certain high-durability classifications, such as Type R or F hollow bricks under ASTM C652, ensuring the units can withstand at least 50 cycles of freezing and thawing without excessive weight loss or cracking. This threshold is particularly critical for concrete masonry units (CMUs), where air-entrainment and low water-cement ratios further enhance performance during repeated exposure.^[146] Sulfate attack represents another chemical durability challenge, primarily affecting cement-based mortars and grouts in masonry when exposed to sulfate-rich soils or groundwater, resulting in expansive ettringite formation that causes cracking and disintegration. This degradation is more pronounced in Portland cement with high tricalcium aluminate (C3A) content, and mitigation involves using sulfate-resistant cements with low C3A (typically under 5%) or supplementary materials like pozzolans to bind sulfates. In masonry walls, this attack often manifests at the base, accelerating if moisture facilitates sulfate migration into joints.^[147]^[148] Permeability classes guide the choice of mortar for varying exposure levels, with Type M mortar—specified under ASTM C270 for its high compressive strength (over 2,500 psi)—recommended for severe weathering environments like below-grade applications or coastal areas to reduce water penetration through joints. This mortar type, composed of Portland cement, lime, and sand, offers lower permeability compared to softer types, thereby protecting embedded elements from moisture-related issues. Corrosion of embedded steel in reinforced masonry systems, such as bed joint reinforcement, arises from chloride ingress or carbonation that depassivates the protective oxide layer, leading to rust expansion and cracking of surrounding mortar or units. Preventive measures include using galvanized or stainless steel and ensuring a minimum concrete cover of 2 inches in moderate exposures, as per building codes.^[76] Ongoing maintenance is vital to extend masonry durability, with repointing of deteriorated mortar joints recommended every 25-50 years to restore weather resistance and prevent water infiltration that exacerbates freeze-thaw or sulfate damage. Efflorescence, the white salt deposits on masonry surfaces from soluble salts leaching out with evaporating moisture, should be cleaned promptly using low-pressure water washing or dilute muriatic acid solutions to avoid surface staining and underlying erosion, ideally in dry conditions to minimize reoccurrence.^[6]^[149]^[63] From a sustainability perspective, incorporating recycled content enhances masonry's environmental profile, such as using 20-30% fly ash as a cement replacement in concrete blocks, which reduces virgin material demand while improving sulfate resistance and workability. Lifecycle CO2 emissions for low-rise masonry buildings are generally lower than those for steel-framed equivalents, with brick masonry structures emitting up to 20-30% less embodied carbon due to the material's longevity and lower production energy intensity.^[150]^[151]^[152]

Analysis and Design

Modeling Techniques

Modeling techniques for masonry structures encompass a range of approaches to simulate mechanical behavior under various loading conditions, from simplified empirical methods to advanced numerical simulations. These techniques are essential for predicting failure modes, such as cracking, sliding, and crushing, in both unreinforced and reinforced systems. Empirical models provide efficient approximations for large-scale analysis, while numerical methods offer detailed insights into localized phenomena like joint interactions. Validation of these models typically involves comparison with experimental data to ensure accuracy in capturing nonlinear responses. Empirical modeling treats masonry as a homogenized orthotropic continuum, averaging the heterogeneous composition of units and mortar into an effective material with direction-dependent properties. This approach assumes the structure behaves as a continuous medium with anisotropic stiffness, suitable for global response predictions in structures like walls and arches. The orthotropic nature accounts for differing moduli in directions parallel and perpendicular to the bed joints, often derived from micromechanical homogenization techniques that upscale unit-level properties. Such models are computationally efficient for preliminary design and seismic assessment, reducing the need for detailed geometry representation. Numerical methods, particularly finite element analysis (FEA), employ micro-modeling to explicitly represent the distinct components of masonry, including units as continuum elements and mortar joints as zero-thickness interfaces. In this strategy, bricks or blocks are modeled with elastic or elastoplastic behaviors, while interfaces capture debonding, sliding, and crushing through contact formulations. Micro-modeling excels at simulating progressive damage, such as diagonal shear cracking, by allowing independent failure in units and joints, though it requires finer meshes and higher computational resources compared to homogenized approaches. For dry-stack masonry without mortar, the discrete element method (DEM) is preferred, representing units as rigid or deformable blocks interacting via frictional contacts that permit separation and rotation. DEM effectively models collapse mechanisms like rocking and sliding in unreinforced dry joints, making it ideal for historical or rubble masonry analysis.^[153]^[154]^[155] Key to these models is the incorporation of failure criteria, such as the Mohr-Coulomb criterion for shear behavior at interfaces, expressed as

\tau = c + \sigma \tan \phi

where \tau is the shear strength, c is cohesion, \sigma is normal stress, and \phi is the friction angle. This linear envelope predicts failure when shear exceeds the frictional resistance plus cohesive capacity, commonly calibrated from triplet shear tests for mortar joints. Additionally, nonlinear stress-strain curves are used to represent compressive and tensile behaviors, featuring initial linearity followed by softening due to microcracking and post-peak degradation, often idealized with multilinear or exponential functions to match experimental envelopes. These curves enable simulation of ductility and energy dissipation in cyclic loading scenarios.^[156]^[157] Commercial software facilitates implementation of these techniques, with DIANA offering specialized engineering masonry models that combine cracking, shearing, and crushing in smeared crack formulations for continuum elements. ABAQUS supports micro-modeling through cohesive zone elements for interfaces and DEM-like capabilities via explicit dynamics for discrete simulations. Model reliability is established through validation against in-situ tests, such as flatjack methods for modulus estimation or ambient vibration surveys for dynamic properties, ensuring predictions align with actual structural responses in existing buildings.^[158]^[159]^[160]

Current Standards and Innovations

In the United States, the 2024 International Building Code (IBC) governs masonry design, incorporating requirements from The Masonry Society's TMS 402-22 standard (jointly developed with ACI 530 and ASCE 5), which specifies seismic provisions based on design categories A through F, with increasing stringency for higher categories to ensure structural integrity during earthquakes.^[161] For categories A, B, and C, masonry walls must use Type M, S, or N mortar for lateral force-resisting systems, while categories D through F demand reinforced designs with enhanced detailing for shear walls and connections.^[162] In Europe, Eurocode 6 (EN 1996-1-1:2005) provides the framework for masonry structures, employing partial safety factors such as γ_M = 1.5 for material properties in ultimate limit states to account for variability in strength and loading, ensuring durability and serviceability across member states; as of 2025, the second generation of Eurocodes is under development, with EN 1996-2 updated in 2024 and full implementation expected around 2027-2028.^[163]^[164] Global trends emphasize resilience and sustainability, particularly in seismic zones. Following the 2011 Tohoku earthquake, Japan's Building Standard Law was revised to enhance seismic resilience in structures through improved design standards.^[165] Masonry's thermal mass contributes to green building certifications, earning Leadership in Energy and Environmental Design (LEED) credits under the Energy and Atmosphere category by reducing heating and cooling loads through passive solar strategies, potentially qualifying for up to 18 points in optimized energy performance as of LEED v4.1 (updated 2024).^[166] Innovations are advancing masonry toward efficiency and environmental compatibility. 3D-printed masonry units, such as robotic extrusion of bio-based bricks, enable complex geometries with reduced waste compared to traditional laying, with applications demonstrated in performative designs for curved, load-bearing walls.^[167] Smart sensors embedded in "smart bricks" facilitate real-time crack monitoring via strain gauges, detecting deformations around 0.01% in masonry walls during in-plane loading, enhancing structural health assessment without invasive inspections.^[168] Sustainable bio-based mortars, including geopolymers derived from fly ash, cut CO2 emissions by 70-80% relative to Portland cement while maintaining compressive strengths exceeding 20 MPa, promoting low-carbon alternatives in eco-friendly construction.^[169] Key concepts like performance-based design (PBD) shift from prescriptive rules to targeted outcomes, allowing masonry structures to achieve specific seismic performance levels—such as life safety under 475-year return periods—through nonlinear analysis and customized detailing.^[170] Integration with Building Information Modeling (BIM) software streamlines masonry workflows, enabling automated layout optimization and clash detection, with ongoing initiatives like the BIM-M project developing resources for incorporation of masonry elements into digital twins.^[171]

References

[1]
Concrete and Masonry Construction | NC DOL
Masonry is building and fabricating in stone, clay, brick, or concrete block. Masonry also refers to the building units (stone, brick, etc.) themselves.
[2]
[PDF] BASIC COMPONENTS OF MASONRY - Purdue Engineering
Oct 3, 2004 · Three basic kinds of movement joints are used in masonry construction: expansion joints, control joints, and construction joints. 1 ...
[3]
Masonry Workers : Occupational Outlook Handbook
Masons build structures with brick, block, and stone, some of the most common and durable materials used in construction. They also use concrete—a mixture of ...
[4]
Brick Masonry and Sustainable Construction - Scholars' Mine
Mar 1, 2012 · Bricks are known for high strength, durability, and long life span. By nature, masonry is not prone to insects' attacks and is more resistant to ...
[5]
[PDF] History of construction - Henry M. Rowan College of Engineering
The grandest buildings were constructed in stone, often from massive masonry blocks. The techniques used to move massive blocks used in pyramids and temples ...
[6]
[PDF] Preservation Brief 2: Repointing Mortar Joints in Historic Masonry ...
Thus, the mortar found in masonry structure s built between 1873 and 1930 can range from pure lime and sand mixes to a wide variety of lime, portland cement, ...
[7]
Brick, Stone, and Mortar: Their History, Uses, and Repair ...
By the middle of the nineteenth century, masonry construction was almost as common as wood construction. This workshop will introduce participants to ...
[8]
Masonry in the Context of Sustainable Buildings - NASA ADS
The most effective and significant component of any construction is masonry. The Colosseum, buildings from ancient Greece and Rome, Central American buildings, ...
[9]
The Secretary of the Interior's Standards for Rehabilitation ...
While masonry is among the most durable of historic building materials, it is also very susceptible to damage by improper maintenance or repair techniques.
[10]
Types Of Masonry Every Construction Person Should Know
Masonry is the skill of sequentially laying down various masonry units, such as brick, stone, concrete blocks, etc., with mortar to create uniform building ...Missing: definition | Show results with:definition
[11]
[PDF] 3.1 masonry small structures
There are also three basic types of stone used for arched construction: rubble, ashlar and squared (dressed). (See Figure 3.3.) The distribution of masonry ...
[12]
[PDF] Building Concrete Masonry Homes: Design and Construction Issues
1) Architectural block. Many options are now available in the appearance of concrete masonry units, including the face type, the size, and the color. Use of ...
[13]
Masonry Skills: Why Are They Important In The Construction Industry?
Masonry is essential because it is a unique construction technique that can make the structure of buildings safe and durable.
[14]
[PDF] MASONRY - Alexandria, VA
May 2, 2024 · Masonry building and garden walls are character-defining features that help define a property's architectural style and age.
[15]
[PDF] The Significance of the Ancient Standing Stones, Villages, Tombs on ...
These massive stone constructions represent great resources of manpower, advanced technical ingenuity, and social organization (12, p 7). The first Neolithic ...Missing: BCE | Show results with:BCE
[16]
Probing Question: How were the Egyptian pyramids built? - Penn State
Apr 15, 2014 · Scholars have found evidence that copper chisels were used for quarrying sandstone and limestone, for example, but harder stones such as granite ...Missing: techniques BCE
[17]
[PDF] The Stones of The Pyramids - Harvard University
The limestone used in the construction of the pyramid came from different quarries to the east and south of the building and, as demonstrated above, from the ...Missing: BCE | Show results with:BCE
[18]
Lecture 6 - Ancient Egypt c
The Egyptians were the first civilization to master the technique of stone masonry and to construct complex stone edifices. Papyrus reed generated another ...Missing: BCE | Show results with:BCE
[19]
The Museum Journal | The Ziggurat of Ur
It is solid throughout, of crude brick inside with a thick facing of baked bricks laid in pitch for mortar; to secure a bond, reed mats dipped in pitch were ...Missing: fired bitumen
[20]
[PDF] THE UNIVERSITY OF CHICAGO ORIENTAL INSTITUTE ...
The Ziggurat and Its Surroundings. UE 5. London and Philadelphia: The ... The mortar used for the baked bricks was bitumen, so that the casing formed a ...Missing: BCE | Show results with:BCE
[21]
Historic Masonry Finishes | Archipedia New England
Both clay and lime mortars were soft, vapor permeable and durable. Unlike modern masonry that seeks to exclude water, they operated as a permeable system that ...
[22]
(PDF) RUBBLE AND MEDIEVAL MASONRY - Academia.edu
This paper addresses whether full ashlar walls are in fact more structurally sound that those constructed of ashlar facings with rubble fill, a typical ...
[23]
The Master Builders of Notre-Dame
Notre-Dame Cathedral's first stone was laid in 1163 by Bishop Maurice de Sully in the presence of Pope Alexander III. Maurice de Sully initiated this ...Missing: pointed | Show results with:pointed
[24]
Cathedral Notre-Dame de Paris: Symbolism, Structure ... - ArchEyes
Dec 6, 2024 · Ribbed vaults, pointed arches, and flying buttresses are not merely aesthetic flourishes; they are integral to the cathedral's function and form ...
[25]
The Structural System | Durham Cathedral | Medieval Architecture
Durham Cathedral was the first in England with fully ribbed vaults, initially intended for the choir, and used pointed transverse arches in the nave.
[26]
The Flying Buttress: Heroes of Gothic Cathedral Construction
Along with rib vaults and pointed arches, the flying buttress is a fundamental part of Gothic architecture and a real hero of gothic cathedral construction.
[27]
Madrider Mitteilungen - Lens Viewer
15Many segments of walls that can be dated to the original construction of the 14th century courtyards are made of bricks of much larger size. In the passageway ...
[28]
mechanical mortar production in early medieval Europe and at ...
This paper combines the results of the pan-European archaeological research project RESTOMO with that of the interdisciplinary SNF-project “Mortar technology ...
[29]
[PDF] Understanding historic mortar and their varia- tions - DiVA portal
Apr 4, 2007 · This paper shows the variations in Swedish medieval lime mortars with a high rate of binder. By analysing historic mortar with a combina- tion ...
[30]
Brunelleschi Dome | Opera Duomo, Florence
The dome was built between 1420 and 1436 to a plan by Filippo Brunelleschi, and is still the largest masonry vault in the world.
[31]
Filippo Brunelleschi, Dome of the Cathedral of Florence - Smarthistory
Down and out, but still afloat. This huge, hollow dome stays put thanks to its skeletal ribs and “girdle.”
[32]
Architecture in Renaissance Italy - The Metropolitan Museum of Art
Oct 1, 2002 · Filippo Brunelleschi (1377–1446) is widely considered the first Renaissance architect. Trained as a goldsmith in his native city of Florence, ...
[33]
Bricks and the Industrial Revolution - Construction Physics
Sep 17, 2021 · Bricks (like so much else during the industrial revolution) gradually changed from hand-made, crafted items to mass-produced, factory-made objects.
[34]
https://www.magnoliabrick.com/the-evolution-of-brickmaking-from-ancient-techniques-to-modern-innovations
[35]
Brickmaking and Brickmakers - Encyclopedia of Greater Philadelphia
During the nineteenth century, the invention of new steam-powered machinery transformed brick production in many regions of the country, but Philadelphia ...
[36]
History of Cement
The precursor to modern-day cement was created in 1824 by Joseph Aspdin, a British bricklayer and builder, who experimented with heating limestone and clay.
[37]
Portland Cement: The Invention That Changed Building Forever
Joseph Aspdin was an English bricklayer who changed the world. He invented **Portland cement** in 1824. This invention helped create modern concrete, which is ...
[38]
Monadnock Building | Chicago Architecture Center
The northern half, completed in 1891 and designed by Burnham & Root, has exterior walls that layer brick on top of brick, in the load-bearing tradition. But its ...Missing: reinforced masonry Portland cement
[39]
A Chip Off the Old Block: Restoration of Concrete Masonry Units
Apr 20, 2016 · Block production surged during and after World War II, with 1.6 billion concrete masonry units (CMU,) as they are called technically, produced ...Missing: post | Show results with:post
[40]
Seismic Retrofit Ordinances Part 2—Understanding Earthquakes
Feb 28, 2025 · The Parapet Ordinance was enacted in 1969 and became the “original” seismic retrofit ordinance. Like most of the ordinances discussed herein, ...
[41]
Seismic Building Codes | FEMA.gov
Sep 25, 2025 · Some provisions within the IBC, IRC and IEBC are intended to ensure that structures can adequately resist seismic forces during earthquakes.
[42]
[PDF] Technical Notes 40 - Prefabricated Brick Masonry - Introduction
The desire of the construction industry to minimize on-site labor and reduce construction time has resulted in the prefabrication of building components.
[43]
Automatic Concrete Block Making Machine - QGM/Zenith
Automatic Concrete Block Making Machine is a professional brick making machine used to produce new wall material blocks.
[44]
Recycled Concrete Aggregates Market Size Report, 2028
The global recycled concrete aggregates market was estimated at USD 7,708.3 million in 2020 and is projected to reach USD 13,009.8 million by 2028, ...
[45]
How Sustainable Concrete is Shaping Construction in 2025
Dec 19, 2024 · Recycled concrete aggregate (RCA) is quickly gaining traction as a viable, sustainable alternative to traditional raw materials. RCA is produced ...
[46]
An In-depth Analysis of Granite Compressive Strength - East Carbon
Sep 25, 2024 · Granite often demonstrates superior compressive strength (90-210 N/mm2) and this explains why it has become a close ally of many machinists.
[47]
10 Types of Stones that can be Used for Masonry - GharPedia
Jan 8, 2019 · Basalt and Trap ... They are example of igneous rock. They are hard, tough and difficult to work. Its specific gravity is around 3 and compressive ...
[48]
Travertine, Limestone, and Dolomitic ... - Natural Stone Institute
Dolomites generally have higher densities, lower absorptions, greater compressive and bending strengths, and higher abrasion resistance than the calcium ...
[49]
ASTM Standards Test Laboratory for Natural Stone
The Natural Stone Institute's test laboratory is the industry's trusted source for astm testing on granite, marble, and other natural stones.
[50]
[PDF] Stone, Dimension | 2018 Minerals Yearbook
Mar 25, 2022 · the average unit values for various types of dimension stone were granite, $224 per metric ton; limestone, $147 per metric ton; marble, $343 per ...
[51]
10 Types of Stone Masonry Used in Construction | UltraTech Cement
But, because cutting and dressing stones take effort, this type is more expensive than rubble masonry. Some categories are: a) Ashlar Fine Masonry. m-sand-vs- ...
[52]
A Comprehensive Guide To Stone Masonry: Rubble and Ashlar - DSS
This rubble masonry construction is a technique in which stones are laid together without the use of any mortar or adhesive. The stones are typically ...
[53]
Archaic Period - Culture - Masonry
In the processing stage of the stone blocks the Greeks used the technique of anathyrosis to reduce the necessary work, and hence the construction time and cost.
[54]
The Fascinating History of Masonry - Brick Restoration, Inc.
Jun 6, 2025 · Masonry began over 12,000 years ago with stone and mud, evolved with innovations like sun-dried bricks, and saw classical contributions from ...Missing: load- bearing
[55]
[PDF] Dimension Stone Design Manual - Republic Elite
... Natural. Stone Institute. The Natural Stone Institute is a trade association representing every aspect of the natural stone industry. The current membership ...
[56]
[PDF] 9-manufacturing-of-brick.pdf
Brick may be produced in this manner by machine or by hand. Dry-Press Process - This process is particularly suited to clays of very low plasticity. Clay is ...Missing: handmade serpentine
[57]
[PDF] The Fundamentals of Brick Manufacturing - AIUB
Brick is made of clay or shale formed, dried and fired into a durable ceramic product. There are three ways to form the shape and size of a brick: extruded ( ...
[58]
Optimizing the thermophysical qualities of innovative clay–rGO ...
Dec 7, 2023 · Clay and sand mixtures are traditionally formed, dried, and fired at temperatures between 900 and 1100 °C to produce bricks13. Whereas, the ...
[59]
Standard Specification for Building Brick (Solid Masonry Units Made ...
Jul 11, 2023 · This specification covers building bricks intended for use in structural and nonstructural masonry where external appearance is not a requirement.
[60]
Should you Use Machine-Made or Handmade Bricks?
Both handmade and machine-made bricks offer distinct advantages. There is no reason to suggest that one is preferable to the other, but we'd highly recommend ...Missing: pressed serpentine
[61]
[PDF] Thermal expansion of clay building bricks
The coefficients of thermal expansion of 139 bricks were measured over the range. -10° to +400 C (140 to 1040 F). These bricks included 1 sample of sand-lime,.Missing: sources | Show results with:sources
[62]
[PDF] 23A - Efflorescence – Causes and Prevention
General. • Design and construct brickwork to maximize water penetration resistance. • Positively identify efflorescence. • Determine if the efflorescence is ...
[63]
CMU Manufacturing Process - Nitterhouse Masonry Products
Raw materials are mixed with water, formed into a mold and left to cure for a period of time. The basic process is simple.
[64]
Block Manufacturing - Century Concrete Products
The production of concrete blocks consists of four basic processes: mixing, molding, curing, and cubing.The blocks pass through a cuber which aligns each ...
[65]
[PDF] AUTOCLAvED AERATED CONCRETE MASONRy UNITS
Feb 1, 2010 · The basic raw materials used in the manufacture of AAC are portland cement, lime, water, sand or fly ash, and aluminum. The sand is ground to a ...
[66]
C90 Standard Specification for Loadbearing Concrete Masonry Units
Dec 20, 2023 · There are three classes of concrete masonry units: Normal Weight, Medium Weight, and Lightweight. These units are suitable for both loadbearing ...
[67]
Concrete Masonry Unit Shapes, Sizes, Properties, and Specifications
These units are manufactured to simulate conventional CMU, clay masonry, concrete brick, and stone and as such exhibit a wide and sometime random array of ...<|control11|><|separator|>
[68]
Types of Insulation | Department of Energy
Insulating cores increases wall R-value. Insulating outside of concrete block wall places mass inside conditioned space, which can moderate indoor temperatures.Types Of Insulation · Sprayed-Foam And... · Structural Insulated Panels<|control11|><|separator|>
[69]
Seismic Design Forces on Concrete Masonry Buildings - CMHA
INTRODUCTION. This TEK describes procedures for determining loads to be used when designing masonry buildings to resist earthquakes.Missing: units | Show results with:units
[70]
Resources - Capitol Concrete Products
Water Absorption (Average of 3 blocks) · Lightweight: 18 lbs. per cubic ft. maximum · Medium Weight 15 lbs. per cubic ft. maximum · Normal Weight 13 lbs. per cubic ...
[71]
Masonry Mortar Types and Joints - Archtoolbox
May 16, 2021 · Description of the various types of mortar including characteristics and when to use each type. Mortar joints are also discussed.
[72]
[PDF] Mortars for Brickwork – Selection and Quality Assurance
Type N cement-lime mortar always includes 1 volume of cement, but the volume of lime is permitted to range between ½ and 1¼.
[73]
Mortar Types - Type N, S, M, O - Amerimix
Type M mortars deliver 2,500 psi compressive strength, whereas Type S mortars deliver around 1,800 psi compressive strength. While either Type S or Type M ...
[74]
Mortars for Concrete Masonry - CMHA
Types IS, IS-A, IP, IP-A, I(PM), or I(PM)-A blended cements may be used as alternatives to portland cement to produce ASTM C 270 compliant mortars. Types S or ...
[75]
How Long Does Mortar Take to Cure? Tips & Timeline
Jan 13, 2020 · Mortar typically will cure to 60% of its final compressive strength within the first 24 hours. It will then take about 28 days to reach its final cure strength.Missing: 7-28 2.4-5 MPa<|separator|>
[76]
Masonry Cement and Sand Mortar (M,S,N) - Spec Mix
Allow mortar to cure a minimum of 7 days but no more than 28 days before cleaning. Consult manufacturer of the masonry units and cleaning chemicals for further ...Missing: moist 2.4-5 MPa
[77]
[PDF] ROCKERY DESIGN AND CONSTRUCTION GUIDELINES
Rockeries are earth retaining structures of interlocking, dry-stacked rocks without mortar or steel, relying on rock weight, size, and shape for stability.
[78]
Seismic numerical analysis of an Inca stone wall in Sacsayhuaman ...
This study uses advanced numerical methods to understand how geometrically complex dry-stone walls would respond to earthquakes. The methodology involves the ...
[79]
(PDF) Fabrication Methods of the Polygonal Masonry of Large ...
May 28, 2025 · The article suggests methods that allow creating the most complicated type of polygonal masonry existing in Peru.Missing: scholarly | Show results with:scholarly
[80]
[PDF] SECTION 04600 DRY STONE WALL RETAINING SYSTEM PART 1
The typical range for batter is 1:12 to 1:6. A vertical wall face is not ... (RA) who is experienced in dry stone wall construction design and licensed ...
[81]
Mechanism and Internal Stability of Supportive Stone Constructions
Apr 27, 2022 · Friction forces are transmitted between the rocks, or between rock and mortar, and can counteract the earth pressure. In the case of a dry ...Missing: techniques | Show results with:techniques
[82]
Friction - Coefficients for Common Materials and Surfaces
Stone, Clean and Dry, 0.2 - 0.4. Wood, Concrete, Clean and Dry, 0.62. Wood, Brick ... Typically steel on steel dry static friction coefficient 0.8 drops to 0.4 ...
[83]
Design and Construction of Dry-Stack Masonry Walls - CMHA
The first course of dry-stack block should be placed on a smooth, level bearing surface of proper size and strength to ensure a plumb and stable wall. Minor ...
[84]
Concrete Masonry Veneers - CMHA
Masonry veneers are typically designed using prescriptive code requirements that have been developed based on judgement and successful performance. The ...
[85]
Best practices for masonry veneer construction
Aug 14, 2019 · Code requirements for masonry veneer walls are outlined in the Masonry Society (TMS) 402/602-16, Building Code Requirements and Specification ...
[86]
[PDF] Tech Notes 44B - Wall Ties for Brick Masonry
These ties are used to connect multiple wythes of masonry, often of different materials; anchor masonry veneer to backing systems other than masonry; and ...
[87]
Masonry Anchors and Ties and the 2016 TMS402 Building Code
Anchor Spacing: Adjustable Anchors and Corrugated Sheet-Metal Anchors require one anchor every 2.67 ft² (16” x 24”). All other anchors require one anchor ...
[88]
The Ultimate Guide on Masonry Veneer Types: Pros and Cons
Nov 22, 2022 · Most types of masonry veneer can be broken into two main categories: Adhered and Anchored. Traditionally, masonry veneer is applied to the ...
[89]
[PDF] 28D | Brick Veneer/Concrete Masonry Walls
Drainage/Air Space. • 2 in. (51 mm) minimum air space recommended; 1 in. (25.4 mm) minimum air space* required. • For brick veneer, do not exceed 6⅝ in.
[90]
Flashing brick veneer walls - Pro Masonry Guide
For flashing to drain water properly, you must have weep holes in place (16-inches (max) for wick-type and 24 inches maximum for open weep holes).Whether ...
[91]
[PDF] Installation Guidelines for Adhered Concrete Masonry Veneer
Mar 9, 2009 · This guide addresses acceptable methods and details for installation of Adhered Concrete Masonry. Veneer. The purpose is to serve as a.
[92]
[PDF] Tech Hotline: Quick Reference Guide on Adhered Masonry Veneers ...
This industry standard requires minimum 50 psi shear bond strength to supporting wall construction.
[93]
Standard Specification for Adhered Manufactured Stone Masonry ...
Jul 6, 2023 · This specification establishes the minimum product requirements for adhered manufactured stone masonry veneer (AMSMV) units.
[94]
Are There ASTM Standards for Manufactured Stone Veneer? - CMHA
ASTM C1670/C1670M covers the minimum product requirements for the units used in adhered manufactured stone masonry veneer systems. This standard covers ...
[95]
[PDF] Accommodating Expansion of Brickwork - Brick Industry Association
For brickwork with multiple openings, consider symmetrical placement of expansion joints and reduced spacing of no more than 20 ft (6.1 m) o.c.
[96]
[PDF] Design of Concrete Masonry Veneer for Crack Control
The maximum panel length (control joint spacing) recommended for concrete masonry veneer is 26 feet. Brick has different movement properties than concrete ...
[97]
https://www.gobrick.com/content/userfiles/files/tn18a-Accommodating-Expansion-of-Brickwork.pdf
[98]
[PDF] TM 5-809-3 Masonry Structural Design for Buildings
Oct 30, 1992 · Equivalent Wall Thickness for Computing Compression and Shear Stress Parallel to the Wall for Hollow Concrete Masonry Units, Inches. 5-3. Area ...
[99]
2021 International Residential Code (IRC) - R606.4.1 Minimum ...
4.1 Minimum thickness. The minimum thickness of masonry bearing walls more than one story high shall be 8 inches (203 mm).
[100]
Tallest load-bearing brick building | Guinness World Records
The tallest load-bearing brick building is the Monadnock Building ... The New York Tribune building was renovated between 1900 and 1905, doubling its height.Missing: historic pre-
[101]
[PDF] national register of historic places inventory -- nomination form
The Monadnock, built in two portions—north and south, is one of the largest masonry bearing wall structures ever constructed. It is often described as a triumph ...<|separator|>
[102]
[PDF] Compressive strength of slender concrete masonry walls
UNREINFORCED. WALLS. (NCMA.I968). FIG. 7.2. Page 98. limits the maximum h/ t ratio to 20 for unreinforced load-bearing walls. Computed allowable loadsfor the 8- ...
[103]
[PDF] THE INFLUENCE OF SLENDERNESS ON CAPACITY OF ...
Slenderness, measured by height/thickness ratio, influences masonry wall capacity. Codes allow ratios exceeding 20, but some recommend a limit of 27 or 30.
[104]
Brickwork under eccentric compression: Experimental results and ...
The load carrying capacity of masonry structures under eccentric loading is a primary issue for the assessment of several structural elements, such as walls ...
[105]
ASD of Concrete Masonry (2012 IBC & 2011 MSJC) - CMHA
The allowable axial compressive force is based on the compressive strength of masonry and the slenderness ratio of the element in accordance with the following:.
[106]
https://www.sciencedirect.com/science/article/abs/pii/S0950061808002675
[107]
[PDF] Masonry Partition Walls
The Masonry Society's TMS 402 code defines a partition wall as an interior wall without any structural function. It is a non-loadbearing wall that does not ...
[108]
[PDF] Annotated Design and Construction Details for Concrete Masonry
3B-Curtain Walls. Nonloadbearing masonry curtain walls are used to enclose concrete or steel frame structures. Curtain walls are designed to resist lateral ...
[109]
Sound Transmission Class Ratings for Concrete Masonry Walls
Sound Transmission Class (STC) estimates a wall's acoustic performance. STC ratings for concrete masonry walls vary based on wall weight and construction.DETERMINING SOUND... · CONTRIBUTION OF DRYWALL · BUILDING CODE...
[110]
Acoustic Benefits of Concrete Masonry Unit (CMU) Construction
A standard 8-inch CMU wall achieves a Sound Transmission Class (STC) rating of 45–50, reducing urban traffic noise (70–80 dB) to a faint whisper indoors.
[111]
Design of Concrete Masonry Infill - CMHA
Masonry infill refers to masonry used to fill the opening in a structural frame, known as the bounding frame. The bounding frame of steel or reinforced concrete ...Design Of Concrete Masonry... · Masonry Infill Load Response · In-Plane Shear For...
[112]
Concrete Masonry Fence Design - CMHA
Concrete masonry fences and garden walls are used to fulfill a host of functions, including privacy and screening, security and protection, ornamentation, ...Missing: non- | Show results with:non-
[113]
Bracing Concrete Masonry Walls Under Construction - CMHA
This TEK provides guidelines for masonry wall stability to resist the lateral loading effects of wind during construction.
[114]
[PDF] MOVEMENT CONTROL CONCRETE MASONRY
May 19, 2021 · Spacing of Cross Rods: Not more than. 16 inches o.c.. HORIZONTAL JOINT REINFORCEMENT. Exactly 16” – there are some manufacturers with cross ...
[115]
Lightweight Concrete Masonry - Stalite
Masonry units made with STALITE are significantly lighter and easier to install. Compared to heavyweight units of the same size, weight reductions of up to 30% ...
[116]
[PDF] 28B - Brick Veneer/Cold-Formed Steel Framed Walls
The cold-formed steel framing and exterior sheathing of a brick veneer/cold-formed steel framed wall can be constructed prior to laying the brick veneer wythe.
[117]
[PDF] Technical Notes 17 - Reinforced Brick Masonry - Introduction
Reinforced brick masonry (RBM) consists of brick masonry which incorporates steel reinforcement embedded in mortar or grout. This masonry has greatly ...Missing: mixes | Show results with:mixes
[118]
Grout for Concrete Masonry - CMHA
Grout is composed of cement, aggregate, lime (optional) and sufficient water to allow ease of placement and ensure complete filling of the grout space.Missing: RBM RM
[119]
[PDF] 17A - Reinforced Brick Masonry - Materials and Construction
Common examples of RBM elements are beams, columns, pilasters, multi-wythe brick walls with grouted collar joints and hollow brick walls. This Technical Notes ...Missing: RM | Show results with:RM
[120]
[PDF] Reinforced Masonry, An alternative to Reinforced Concrete
In RM construction, the masonry walls are designed to carry the gravity and as well as lateral load resisting mechanism. 1. Senior Lecturer, Department of Civil ...
[121]
C476 Standard Specification for Grout for Masonry - ASTM
Jan 4, 2024 · This specification covers two types of grout, fine and coarse grout, for use in the construction of masonry structures.
[122]
[PDF] Building Code Requirements for Masonry Structures (ACI 530-02 ...
5.4.2 Allowable compressive stresses. Lateral support. 5.5.1 Intervals ... Compressive strength of masonry Maximum compressive force resisted per unit ...Missing: ultimate | Show results with:ultimate
[123]
Seismic Resilience of Masonry
Aug 11, 2022 · After the 1994 Northridge earthquake, major changes were implemented in the 2000 International Building Code (IBC) cycle. New “near-fault ...
[124]
[PDF] Seismic Design of Special Reinforced Masonry Shear Walls
Building code requirements for masonry structures (TMS 402/ACI 530/ASCE 5), The Masonry. Society, Longmont, CO. TMS (2013b). Specifications for masonry ...
[125]
Challenges, opportunities, and solutions in low-cost building ...
Typical compressive strength values of masonry can range from 7 MPa to 20 MPa for commonly used concrete masonry units (CMU). Compressed earthen masonry usually ...
[126]
Strength Parameters of Clay Brick Walls with Various Directions of ...
Oct 28, 2021 · The highest compressive strength of 15.1 MPa was obtained for samples loaded in the direction perpendicular to the bed joints (θ = 0°). The ...
[127]
Modeling of masonry failure surface under biaxial compressive ...
Masonry is a brittle anisotropic material that exhibits distinct directional properties because the mortar joints act as planes of weakness.
[128]
[PDF] Mechanical Properties of Unreinforced Brick Masonry, Section1 - OSTI
Oct 7, 2009 · specified in ASTM. Table 1.2: Compressive strengths of several types of bricks. ASTM C62: Clay or Shale bricks. Type Average compressive ...
[129]
2000 International Building Code (IBC) - 2108.7.2 Modulus of ...
The design of clay and concrete masonry shall be based on the following modulus of elasticity values: E m = 700 f′ m for clay masonry E m = 900 f′ m for ...Missing: 500-1000 | Show results with:500-1000
[130]
Standard Test Method for Compressive Strength of Masonry Prisms
Aug 12, 2022 · This test method provides a means of evaluating compressive strength characteristics of in-place masonry construction through testing of prisms obtained from ...
[131]
C1072 Standard Test Methods for Measurement of Masonry Flexural ...
Dec 23, 2022 · These test methods evaluate the flexural bond strength, normal to the bed joints, of masonry built of manufactured masonry units.
[132]
Influence of brick–mortar interface on the mechanical behaviour of ...
Apr 1, 2015 · A study of the influence of the brick–mortar interface on the pre- and post-cracking behaviour of low bond strength masonry wall panels subjected to vertical ...
[133]
[PDF] Fire Resistance of Brick Masonry
For most fire resistance ratings ASTM E119 requires that walls be subjected to both a fire endurance test and a hose stream test. The hose stream test subjects ...
[134]
[PDF] NCMA-Tek-7-1B-Fire-Resistance-Ratings-of-Concrete-Masonry ...
ASTM E 119 heat transmission criteria. Using these provisions for an 8-in. (203-mm) concrete masonry wall with a maximum control joint width of 1/2 in. (13 ...
[135]
https://www.sciencedirect.com/science/article/pii/S014102961400755X
[136]
Table 6 Thermal Conductivity, Specific Heat Capacity and Density
Brick & Block Work ; Brickwork (Outer Leaf). 0.840. 800 ; Brickwork (Inner Leaf). 0.620. 800 ; Concrete Block (Heavyweight). 1.630. 1000 ; Concrete Block (Medium).
[137]
Thermal Conductivity of Clay Bricks - Thermtest
Dec 13, 2021 · Bricks possess a low thermal conductivity which averages between 0.5 – 1.0 W/(m/K). The thermal conductivity of a material directly relates to ...
[138]
Insulating masonry cavity walls with partial fill insulation
Partial fill Mannok Therm Wall / MW insulation with internal wet plaster: ; Thickness (mm) · 50 · 60 ; U-value (W/m2K) · 0.30 · 0.26 ; U-value (W/m2K) · 0.29 · 0.25 ...
[139]
Fire Protection of Building Structures with Intumescent Coatings
When exposed to fire, building materials lose integrity. Concrete can spall and crack exposing rebar, which can lead to structural failure.
[140]
ISSUES WITH MASONRY AND FIRE: SPALLING AND THERMAL ...
One common issue is concrete spalling (pieces of the concrete falling off or violently exploding). The second common issue is thermal bowing (when the wall ...
[141]
Comprehensive guide to Cavity Barriers - Tenmat
Nov 4, 2024 · Cavity barriers are fire-resistant products installed in the cavities of walls, floors, and ceilings to prevent the spread of fire and smoke.
[142]
C216 Standard Specification for Facing Brick (Solid Masonry Units ...
Aug 30, 2023 · Bricks shall be classified according to their resistance to damage by freezing when saturated at a moisture content: Grade SW and Grade MW. The ...
[143]
Brick Testing and ASTM Requirements - Masonry Magazine
Feb 7, 2024 · Building bricks (ASTM C62) are solid, with no voids, used “where external appearance is not a requirement.” It is important to note that the 25% ...
[144]
Sulfate attack in concrete and mortar - Understanding Cement
Internal sulfate attack. Occurs where a source of sulfate is incorporated into the concrete when mixed. Examples include the use of sulfate-rich aggregate, ...
[145]
Precautions against sulfate attack - American Concrete Institute
Sulfate attack is either a chemical or physical reaction, or both, between sulfates—usually in soil or ground water and concrete or mortar. The chemical ...
[146]
Control and Removal of Efflorescence - CMHA
One method of removal reported to be effective is the use of high pressure water jet, sometimes augmented with the addition of fine sand to the water.
[147]
Determining the Recycled Content of Concrete Masonry Products
For the example in Figure 1, the percent recycled content for the concrete masonry units is 17.9% + 1/2(37.1%) = 36.5%introduction · use of recycled materials in... · determining recycled content
[148]
Comprehensive Procurement Guidelines for Construction Products
Aug 16, 2025 · Fifteen percent is a more accepted rate when coal fly ash is used as a partial cement replacement as an admixture in concrete. According to ASTM ...
[149]
Life cycle carbon emissions inventory of brick masonry and light ...
The brick masonry house presented less CO2eq emissions than the light steel framing one. For both houses, the operational phase was the most significant ...Missing: rise | Show results with:rise
[150]
Simulating masonry wall behaviour using a simplified micro-model ...
Nov 15, 2017 · In the Micro-model approach, the simulation can be detailed; the units and mortar are modelled as continuum elements and unit-mortar interfaces ...<|separator|>
[151]
Discrete Element Bonded-Block Models for Detailed Analysis of ...
Feb 25, 2022 · The DEM bonded-block model is composed of discrete blocks, separated by discontinuity surfaces of two types: (i) the real masonry joints and ...
[152]
A finite-discrete element model for dry stone masonry structures ...
May 1, 2015 · This paper presents a new robust finite-discrete element numerical model for analysis and prediction of the collapse of dry stone masonry structures
[153]
Determination of Mohr–Coulomb failure envelope, mechanical ...
Apr 16, 2022 · In general, the failure behaviour of the mortar joints in masonry is defined using the Mohr–Coulomb failure criterion [13, 22,23,24,25,26,27,28] ...
[154]
[PDF] Stress-Strain Characteristics of Clay Brick Masonry under Uniaxial ...
A simple analytical model has been proposed for obtaining the nonlinear stress-strain curves of masonry, which is a function of only the compressive strengths.
[155]
Engineering masonry model - DIANA User's Manuals
May 23, 2023 · The Engineering Masonry model is a smeared failure model that can be applied in combination with regular plane stress (membrane) and curved shell elements.
[156]
[PDF] Simulating masonry wall behaviour using a simplified micro-model ...
The capability of the proposed model was demonstrated by validation studies of the response of masonry structures under monotonic in- plane, out-of-plane ...
[157]
Dynamic calibration and seismic validation of numerical models of ...
Jun 18, 2021 · In-situ tests allow for the acquisition of data on a local scale by providing details on the mechanical properties of materials, actual decay ...
[158]
CHAPTER 21 MASONRY - 2024 INTERNATIONAL BUILDING ...
Masonry structures and components shall comply with the requirements in Chapter 7 of TMS 402 depending on the structure's seismic design category.Missing: 530 | Show results with:530
[159]
Masonry in Seismic Design Categories A, B and C | UpCodes
Mortar for masonry serving as the lateral force-resisting system in Seismic Design Categories A, B and C shall be Type M, S or N mortar.
[160]
[PDF] EN 1996-1-1: Eurocode 6: Design of masonry structures
EN 1996-1-1 describes the Principles and requirements for safety, serviceability and durability of masonry structures. It is based on the limit state concept ...
[161]
How Japan spent more than a century earthquake-proofing ... - CNN
Jan 6, 2024 · Architects, engineers and urban planners have long sought to disaster-proof Japan's buildings through ancient wisdom, modern innovation and ...
[162]
Concrete Masonry & Hardscape Products in LEED® 2009 - CMHA
Energy savings attributable to thermal mass inherent in concrete masonry construction contribute to this goal when used in conjunction with passive solar ...
[163]
Performative Design for Robotic 3D-Printed Brick using Biomaterials
Workshop Registration opens September 8th, 2025! Click the link above to be notified when registration becomes available. Refund and Change Policy.<|separator|>
[164]
Strain Monitoring and Crack Detection in Masonry Walls under In ...
Feb 16, 2023 · When deployed in coarse sensor networks, smart bricks can be used to monitor permanent changes in strain, e.g., changes due to earthquake- ...
[165]
Geopolymer mortars as sustainable repair material
Geopolymer binders are preferred because they generate 70–80% less carbon dioxide with remarkably lesser greenhouse gas emissions than ordinary Portland cement.
[166]
Towards Performance-Based Design of Masonry Buildings - MDPI
Contemporary masonry buildings are primarily designed to comply with prescriptive building code regulations. In recent decades, performance-based design (PBD) ...
[167]
The Building Information Modeling for Masonry (BIM-M) Initiative ...
The initiative is identifying barriers to and strategies for the full implementation of masonry materials and systems into BIM software for the design and ...