UNDERSTANDING CONCRETE MIX RATIO. Concrete is classified into different grades like M5, M7.5, M10, M15 etc., where M stands for Mix and the following number stands for characteristic compressive strength(fck) of concrete in 28 days in the Direct Compression test.For example, If the ratio of M20 concrete is 1:1.5:3, then 1 part of cement, 1.5 parts of sand and 3 parts of aggregate (crushed ...

Concrete Mix Design:-In order to calculate amount of cement, sand and aggregate required in 1m 3 of concrete; you have to know about different grades of concrete. As per IS456:2000 based on concrete strength, Different grades of concrete is classified into M5, M7.5, M10, M15 etc., whereas M stands for Mix and the number behind M stands for Characteristic Compressive strength(fck) of the ...

Grades Of Concrete: In IS: 456-1978, the different grades of concrete are given as M10, M25, M20, M25, M30, M35, and M40. In the classification of concrete mix, the letter M denotes the Mix and the numbers 10, 15, 20, 25, 30, 35, 40 represent the predetermined works cube strength of 15 cm cubes after […]