- Jun 8, 2014
M20 is a concrete having charecteristic compressive strength of 20N/sq.mm or more on 28th day. All of us agree to it.
But difference in opinion is on how to obtain it. There are two ways as approved by Indian standards. Firstly by mix design as per IS 10262 Second way is to use the nominal mix proposed by IS456:2000
Nominal mix for shall be proportioned as per table 9 of IS 456. As per table 9 of Is 456, Total quantity of aggregate is 250kg per 50kg of cement (1 bag ) Total aggregate can be proportioned in a ratio 1:1.5 to 1:2.5 (taken normally as 1:2) with maximum water content of 30l.
The minimum cement content and maximum free water cement ratio can be obtained from table 5 for the required exposure conditions and grade of concrete.
Assistant Professor in Civil Engineering
College of Engineering Pathanapuram.
Phone. +91 9656840794