Civil Engineering - Concrete Technology - Discussion

@All.

I only remember M20 which is 1: 1. 5:3 which is a different value from the rest.

So I will remember this then we will add more cement to go to m25, which is 1:1:2 ratio of cement and sand is the same. So here we have more cement. Then we will go to M15, which has less cement than M20.

And it should have more than 1. 5 sand, which is a 2:1:4 proportion. We will add more sand and aggregate to M10, which is a 1:3:6 proportion. Therefore, the quality of concrete is better in M25 and M20 than in M15 and M10.

1 : 2 : 4 is for M15.

M15 1:2:4 .
Not for M150 mix.

So, I think the answer is wrong.

M150 grade is not a nominal mix, it's a design mix which is batched by weight so the answer would be E.

M10 - 1:3:6.
M15 - 1:2:4.
M20 - 1:1.5:3.
M25 - 1:1:2.
1:4:8
M30 - 1:5:10
1:6:12.
M35 - post-tensioned prestressed concrete.
M40 - pre-tensioned prestressed concrete.

1:2:4 is the correct option.

1:2:4 is the correct option.

Option C is Correct, Mix 15 fck is 1:2:4.

The correct answer is M15=1:2:4.
This is not correct M15=1:1:2.

The correct answer is 1:2:4.