# How to determine the quantity of cement, sand and aggregate in M20 grade of concrete mix

In this construction video tutorial, one can learn how to determine the quantities of cement, sand and aggregate in M20 grade of concrete mix.

The proportion of M20 grade of concrete mix is 1: 1.5 : 3. Here 1 = cement, 1.5 = sand and 3 = aggregate.

At first convert wet volume of concrete to dry volume. Here, total quantity of concrete mix is taken as 1M3

For converting to dry volume, multiply 1M3 with 1.52 i.e. 1.52 x 1M3 = 1.52 M3

To find out the volume of cement, the following formula is used :-

1.52/1+1.5+3 x1 (for cement) = 0.2763 cum

We know, the unit weight of cement bag = 1440 M3 i.e. density of cement

Weight of 1 bag of cement = 50 kg

To convert the volume of cement to bag, we should divide unit weight of cement with weight of one bag of cement.

i.e. 1440/50 = 28.8 bags cement

To find out total bag of cement = 0.2763 x 28.8 = 7.95 or 8 bags

To determine the quantity of cement, the following formula is used :-

One bag of cement = 50 kg

Cement in Kg = 50 x 7.95 = 397.5 kg

To convert it to cubic feet = Volume x 35.3147 = 0.2763 x 35.3147 = 9.75 CFT

To find out the quantities of sand and aggregate, watch the following construction video tutorial.

Video Source: Construction Technology