# Grade Of Concrete and Water Cement Ratio

In this Article with video today I will teach you that how to Find Grade of concrete with water cement ratio in detail so after reading this article and watching video you will be able to to now about Grade of concrete and water cement ratio in detail.

We have Given Grade of Concrete:

M5

M7.5

M15

M20

M25

So Here “M” Stands for Mix and Number is the characteristic compressive strengt of concrete after 28 days. and its based on the direct compressive test.

So, There for if I take M5 Grade Concrete so it means that concrete will gain the strength 5N/mm2 ater 28 days and M7.5 means that this is the strength of concrete 7.5N/mm2 after 28 days.

So , For all grade of concrete we used the same formulas.

Now the below Chart is for Grade of concrete and their Mix Ratio
 Grade Mix Ratio (Cement : Sand : Aggregate) M5 1 : 5 : 10 M7.5 1: 4 : 8 M10 1 : 3 : 6 M15 1 : 2 : 4 M20 1 : 1.5 : 3

If you want to find the quantity of water for concrete mix so use the given formula:

 Grade of cement Water per bag (50 kg) cement M5 60 litre M7.5 45 litre M10 34 litre M15 32 litre M20 30 litre

For more detail watch the following video of my channel

By : Engr Sami Ullah Stanikzai