Question

According to is 456, the number of grades of concrete mixes are

Answer 1

As per IS456 following are the grades of concrete:

1.Ordinary Concrete - M10,M15,M20

2.Standard Concrete-M25,M30,M35,M40,M45,M50,M55

3.High Strength Concrete:M60,M65,M70,M75,M80

Where M stands for Mix and 10,15,20....etc is the specified characteristic compressive strength of

150mm cube at 28 days in N/mm^2