TUTORIALS

How to calculate quantity of Concrete Blocks in Cubic Feet

This construction article shows the detailed guidelines for in what way to compute concrete blocks’ quantity in cubic feet.

There are two types of blocks. One is hollow block and second is solid block. In solid block, total concrete is utilized. Gap is there in hollow block. Solid block is made of complete concrete and there is no gap.

There is a solid concrete block with length L = 12” and height H = 8” and thickness T = 6”. There is a wall with length L = 20’ and height H = 11’.

As there is block size 12” x 8” x 6” with mortar 1:4 [1 is cement and 4 is sand]

Calculate number of blocks

= Length x Thickness x Height x Number of wall(s) = Volume (Cft)

Calculate quantity of wall / volume of wall = 20’ x 0.5’ x 11 x 2 = 220 Cft

Add five percent wastage = 5/100 x 220 = 11 Cft

Overall quantity = 220 + 11 = 231 Cft

Volume of 1 block with mortar 3/8” = 12.375 x 6.375 x 8.375 = 660.70 Cubic Inch

= 660.70/1728 = 0.38

Number of blocks = Wall Volume / Block Volume = 231/0.38 = 608 blocks

Calculate cement mortar 1:4

18% Dry Mortar is utilized in Block Masonry

Therefore, dry volume = 18/100 x 231 = 41.58 Cft

Cement = Dry Mod/Ratio Sum = 41.58/5 = 8.31 Cft

Covert in bag,

8.31/1.25 = 6.64 = 7 bags required

Sand = 4 x 41.58/5 = 33.26 Cft sand required for block masonry.

For additional info view the video:

Lecturer: Civil Study