Calculation of cement, sand and aggregate in R.C.C Slab of 100sqft

 100sqft = 9.29sqm.

Suppose thickness of slab = 10cm

Volume of concrete = 9.29x.10 =.93m3

Cement  = 316.8/m3

Sand      = 660k.g/m3

Coarse aggregate = 1320 k.g/m3 of concrete.

Then materials required  for .93m3 is

• concrete  = 316.8x.93 = 294.62 k.g = 5.89 bags
• sand       = 660x.93 =613.8kg  = 14.45 cubic feet

• coarse aggregate = 1320x.93 =1227.6 kg =29 cubic feet

Thumb rule for steel in R.C.C . for normal residential building

1.     For roof slab  80 kg per cubic metre.

1.     For beam it is 120 kg  per cubic metre.

1.     For column it is 160-180 kg per cubic metre.

These all values are for the  normal residential building actual value may differ in case of special design.

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