Cement Content = 400 kg/m3
w/c Ratio = 0.45
sp. Gravity of cement = 3.15
sp. Gravity of 10mm aggregate = 2.83
sp. Gravity of 20mm aggregate = 2.83
sp. Gravity of sand = 2.62
water content = 400 x 0.45 = 180 lit/m3
C.A. 0.98 = [ ( 400/3.15) + 180 + ( c.a./2.83) ] x 1/1000
C.A. 0.98 = ( 126.98 + 180 + 0.54 x c.a. ) x 1/1000
980 = 126.98 + 180 + 0.54 x c.a.
673.02 = 0.54 x c.a.
Therefore, C.A. = 1246.33 kg
60 % 20mm = 747.79 kg/m3
40 % 10mm = 498.53 kg/m3
673.02 = 1/1.35 (f.a./2.62)
673.02 = 1.09 F.A.
Therefore, F.A. = 617.44 kg/m3
Cement = 50 kg
C.A. 20 mm = 98.47 kg
C.A. 10 mm = 62.32 kg
Sand = 77.18 kg
Bulk density of
Sand = 1.69 kg/lit
20 mm = 1.46 kg/lit
10 mm = 1.54 kg/lit
Volumetric conversion
Sand = 45.67 lit
C.A. 20 mm = 64.02 lit
C.A. 10 mm = 40.46 lit
Water = 22.50 lit + 1.5 % for absorbtion
= 22.83 lit say 23 lit
Box Sizes
Sand = 0.36 x 0.36 x 0.36 = 0.0466 m3 = 46.656 lit
C.A. 20 mm = 0.36 x 0.36 x 0.494 = 0.06402 m3 = 64.02 lit
C.A. 10 mm = 0.36 x 0.36 x 0.312 = 0.04043 m3 = 40.44 lit
