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Sunday, 31 May 2020

how to calculate cement, sand and aggregate quantity in m15 concrete in 2021

6.23 Bag of Cement, 12.48 bag of Sand & 25 bag of Aggregate is required for 1m3 of m15 concrete, mix  with proportion of 1:2:4 cement, sand, aggregate respectively, the whole calculation with concept mention below.

Calculation for 1 m3  M15 grade concrete

In m15 concrete total proportion of materials is 7 (1 portion cement+2 portion sand +4 portion aggregate also known as stone chips).
So, in 1m3 concrete
Cement     = 1/7 = 0.142 m3 is equals 4.05 Bag of cement (1 Bag of cement = 0.035 m3 in volume).
Sand          = 2/7 = 0.285 m3 is equals 8.10 Bag of sand (measure in same Cement bag of 0.035 m3).
Aggregate = 4/7 = 0.571 m3 is equals 16.20 Bag of aggregate (measure in Cement bag of 0.035 m3).

The above calculation for dry volume of concrete for 1 m3 M15 concrete.

In practical we use wet concrete for casting, for this reason we have to consider the shrinkage of concrete because in combine with water dry concrete shrinks & reduced its volume with respect to the dry volume.
To get 1 m3 wet concrete we have to procure 1.54 m3 dry concrete.
Relation between wet & dry volume of concrete.

Now to get the exact number of bags of cement, sand, aggregate for casting we have to multiply the dry volume (volume converted to bags) with multiplying factor 1.54 which is nothing but the ratio of wet to dry volume of concrete also known as shrinkage ratio of concrete.

  • Cement     =  4.05 * 1.54 = 6.23 Bag of cement.
  • Sand          =  8.10 * 1.54 = 12.48 Bag of sand .
  • Aggregate =  16.20 * 1.54 = 25 Bag of aggregate. 

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