Basic Practical Knowledge for civil Engineer

In this blog i am going to tell you the basic practical knowledge to calculate material on construction site . This blog is very important for freshers

Calculation of Materials:-

a) For 1 m3 of concrete Mix 1:2:4 (M15)

Add 50% for wet concrete = 1.50 m3

= 1.50/(1+2+4) = 0.214 m3

For 1 m3 = 30 bags of cement required (1440/50) say 30 bags
Cement = 0.214 x 30 = 6.42 bags

Sand = 0.214 x 2 = 0.428 m3

Aggregate = 0.214 x 4 = 0.856 m3

b) 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

c) 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