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How to calculate the quantity for masonry(block and plaster)?
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Answer Posted / mohammed tausif
a) Wall plastering in CM 1:4 of 12 mm thick for 100 m2:-
Volume = 100 x (12/1000) = 1.20 m3
Add 30 to 35% as bulking of sand = 0.36 m3
Add 20 as wastage of sand = 0.312 m3
Total = 1.872 m3
= (1.872/1+4) = 0.374 m3
Cement = 0.374 x 30 = 10.77 bags
Sand = 0.374 x 4 = 1.496 m3
b) For 100 m3 of solid Block masonry in CM 1:6 mix 8” thick:-
Volume = 100 x 0.2 (Thickness of wall)
= 20 m3
No. of blocks required = 20/(0.4 x 0.2 x 0.2)
= 12502 No’s
Volume of mortar = 20-{0.39 x 0.19 x 0.19 x 1250}
= 20 – 17.598 = 2.40 m3
Note: 200mm – 10 mm for mortar thickness = 190 mm
Blocks =17.598/(0.4 x 0.2 x 0.2) =1100 No’s
Add 2% wastage = 22
Total = 1122 No’s
Increase by 25% for dry mortar = 3 M3
= 3/ (1+6) = 0.429 M3
Cement = 0.429 x 30 = 12.50 bags
Sand = 0.429 x 6 = 2.57 M3
Blocks =1122 No’s
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