A concrete masonry unit is a standard size rectangular block used in building construction.
Concrete masonry unit cmu wall.
Values in this tek are based on concrete masonry units with three webs with each web being the full height of the unit and having a minimum thickness as provided in historical versions of astm c90 see table 1.
Concrete blocks are manufactured in required shape and sizes and these may be solid or hollow blocks.
Revisions in 2011 to astm c90 standard specification for loadbearing concrete masonry units ref.
In addition because of its modular nature different concrete masonry units can be combined within the same wall to achieve variations in texture pattern and color.
Cmus are some of the most versatile building products available because of the wide variety of appearances that can be achieved using them.
Concrete blocks are concrete masonry units or cmus but we often refer to them as concrete blocks or cinder blocks.
Finding how many concrete blocks you need for your project can seem like a confusing and challenging task but it can be simplified using the calculator above.
Function concrete masonry units act as bearing wall supports for residential homes and buildings supporting vertical loads such as floor joists arches vaults and.
Knowing how a cmu wall operates and what materials tie the structure together will help you determine whether this bearing wall support is appropriate for your building project.
Area affective in axial compression and in in plane shear.
The main reason people choose a concrete masonry retaining wall over other retaining walls is the limitless options from which one may choose.
Aci 531 a rational design code for concrete masonry first published in 1979 doesn t allow reinforced walls higher than 36 times their thickness and nonreinforced walls higher than 20 times their thickness.
Table 5 6 gives the average weights gross and net areas of concrete masonry units.
The common size of concrete blocks is 39cm x 19cm x 30cm or 20 cm or 10cm or 2 inch 4 inch 6 inch 8 inch 10 inch and 12 inch unit configurations.
Weight of concrete being used.
Working stress design equations.
Concrete masonry units cmus are manufactured in a variety of sizes.
Weight of cmu walls pounds per square foot.
Table 5 5 gives the weight of concrete masonry unit walls.
The thickness of the wall they create.
11 have significantly reduced the minimum amount of web material required for cmu.
Concrete masonry retaining walls.
For instance a 6 cmu is nominally 6 deep while a 10 cmu is nominally 10 deep.
In new zealand and canada they are known as concrete blocks.
In new zealand they are also called.
Ansi a41 1 an empirical code first published in 1944 doesn t allow a masonry wall to be higher than 20 times its thickness.
Concrete block cmu sizes.
They are identified by their depth i e.
Concrete masonry retaining walls are easily the most attractive and longest lasting solution for both new and replacement retaining wall projects.
Certain concrete masonry sizes and shapes.
A wall typically requires 1 1 8 blocks per square foot.