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12 Cards in this Set
- Front
- Back
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Mortar Composition |
Lime Cement Sand Functions (Bonding units together, serving as a seating material for units,leveling and seating the units, providing aesthetic qualities) |
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Grout |
High slump concrete consisting of portland cement, sand, fine gravel, water and lime. Used to fill cores or voids in hollow masonry units for the purpose of: - Bonding the masonry units -Bonding the steel -Increasing bearing area -Increasing fire resistance -improving overturning resistance by increase the weight. |
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Masonry Block |
Formed of low slump concrete consisting of Portland cement, aggregates, water and admixtures. Air-en-trained concrete is sometimes used to avoid freeze thaw deterioration. Units are molded under pressure then cured using a low pressure steam curing. The units are stored in controlled condition in order to continue curing. |
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M Block Prism Specifications |
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Failure Mechanisms |
Fire 90degree failure Curtain Wall collapse |
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Kerns and Kern Distance |
If load is applied in Kern distance then there is no net tensile stress.
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NZS4230 Standards |
17.5 MPa grout
12 MPa unit |
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Clay Brick Units |
Clays are comprised of maily silica, alumina, lime, iron, magnesium, sulfur and phosphates. Bricks are made by grinding and crushing the lay and mixing it with water to make a plastic. Molded, textured, dried and fired. Firing Temp ranges between 900C to 1200C. Building Bricks Facing Bricks Floor Bricks Durable and fire resistant, and require very little maintenance. |
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Structural Limitations |
Effective when loaded compressivley but not transversely. Does not act well under tension unless reinforced. Clay bricks have higher strength then masonry bricks. Poissons ratio. |
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Mechanics of Masonry |
Vmortar > Vunit, poissons ratio. Mortar tends to push out the brick when the compressive axial load is applied. Process of expansion is partially restrained by the brick, hence, there is a tension force in the brick and compressive on the mortar, leading to tensile failure. |
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Characteristic Masonry Strength |
fm = fm - 1.65xm |
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Structural walls |
Have 3 functions -Resist vertical compression -Resist bending from eccentric vetrical loads or transver wind etc. -Resist in-plane shear and bending from the lateral laods applied in the building system in the direction parallel to the wall. |
