How to calculate ingredients of concrete

Dear friends today we are going to learn how to calculate the amount of ingredients present in the concrete… The concrete contains three ingredients cement, sand and aggregate. To calculate quantity of every ingredient of concrete we must know their ratio (Proportion).

          Now consider:-

          Volume of concrete = 1 m^3

          Proportion of concrete = 1:2:4

To calculate quantity of ingredients first we have to calculate volume of dry concrete. Generally the volume of dry concrete is 52 % – 54 % greater than the wet volume of concrete.  

          So,

          Dry volume of concrete = 1 + [(1×52)/100]

          Dry volume of concrete = 1.52 m^3.

   

Now calculate quantity of cement required

Vol. of cement

= (dry vol. of concrete / addition of proportion) × part of cement

         

Vol. of Cement = [1.52 / (1+2+4)] × 1=0.217 m^3

The cement bag of 50 kg weight contains the 0.035 m^3 of cement.

No. of bags =(Vol. of cement in 1 m^3)/0.035 = 0.217/0.035 = 6.2 bags.

Now calculate quantity of sand,

Vol. of sand = (dry vol. of concrete / addition of proportion)  × part of sand

Vol. of sand= [1.52 / (1+2+4)] × 2=0.434 m^3

Now calculate quantity of aggregate,

Vol. of agg. = (dry vol. of concrete / addition of proportion) × part of agg.

Vol. of aggregate = [1.52 / (1+2+4)] × 4=0.868 m^3

From this it is clear that 1 m^3 of concrete with 1:2:4 proportion requires cement of 0.217 m^3, sand of 0.434 m^3 and 0.868 m^3 of aggregate. From the base of this example you can calculate amount of ingredients for any proportion of concrete or any quantity of concrete. Thank You for reading this post. If you have any queries please use comment box to inform me. Thank You.

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