Executive Construction Interview Questions and Answers

The grade of concrete refers to its strength and is denoted by the mix ratio of cement, sand, and aggregate.

• M15 grade concrete has a mix ratio of 1:2:4 (cement:sand:aggregate) and a compressive strength of 15 MPa.

• M20 grade concrete has a mix ratio of 1:1.5:3 and a compressive strength of 20 MPa.

• M25 grade concrete has a mix ratio of 1:1:2 and a compressive strength of 25 MPa.

• The higher the grade, the stronger the concrete.

• These grades are commonly used in construction for vari...read more