Cement concrete hollow blocks have been in use for several masonry constructions. Several advantages have given room for rapid development and use of the same in place of traditional construction materials like stones and bricks.
Typical concrete masonry units are shown in Fig. 16.9 (Sharma, 1988), in addition to the concrete hollow blocks referred to in Chapter 9.
Figure 16.9 Typical concrete masonry units
Based on the job requirement, the concrete blocks may be made. There is no standard size of concrete blocks. However, Concrete Association of India (CAI) recommends that the face thickness should not be less than 5 cm and the net area should be atleast 55–60% of the gross area.
The common sizes for building blocks are given in Table 16.5.
Table 16.5 Common sizes of blocks
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