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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