BTech Module 1: Concrete Masonry

Concrete Masonry Units

Products of Cement, Sand (fine course), & Water molded into shapes and sizes and works similar to other masonry units.

100 mm

4” block =

150 mm

6” block =

200 mm

8” block =

250 mm

10” block =

300 mm

12” block =

ASTM C90

ASTM standard for loadbearing units

ASTM C129

ASTM standard for nonloadbearing units

ASTM C55

ASTM standard for concrete bricks.

Reinforced with steel

Concrete masonry is frequently __________ ____ _____ to increase its load-bearing capacity, or resistance to seismic forces and cracking

Dry-stacked and surface-bonded masonry walls

What type of masonry walls walls are constructed by stacking concrete masonry units in a running bond directly upon one another without the application of mortar. Where leveling is required, metal or high-density plastic shims are used

Surface-bonded masonry unit

A masonry unit construction and materials are governed by ASTM C946

Decorative (or architectural) concrete masonry unit

A masonry unit that are easily and economically manufactured in an unending variety of surface patterns, textures, and colors intended for exposed use in exterior and interior walls.

Structural Glazed Facing Tiles of clay

A masonry unit that is durable, easy to clean surfaces (public corridors, toilets, institutional kitchen, lockers, shower rooms, & industrial plants.

Glass Blocks

A masonry unit that are nonabsorbent. When glass masonry walls are constructed, the mortar stiffens more slowly than it does with these other materials, so temporary spacers are inserted between units to maintain proper spacing until the mortar hardens.

Structural terracotta

A masonry unit that is glazed or unglazed molded decorative units of fired clay

Autoclaved aerated concrete (AAC)

A masonry unit that is made from sand, lime, water, and a small amount of aluminum powder. These materials are reacted with steam to produce a relatively lightweight, aerated concrete that consists primarily of calcium silicate hydrates.