Question

The grade of concrete M 15 means that compressive strength of a 15 cm cube after 28 days is :

• A. $100kg/c{m}^2$
• B. $150kg/c{m}^2$
• C. $200kg/c{m}^2$
• D. $250kg/c{m}^2$

Answer 1

The correct option is B $150kg/c{m}^2$

The compressive strength of M15 grade concrete prepared in 15 cm cube after 28 days is 15 MPa.

$15MPa=15\frac{N}{m{m}^2}=150\frac{kg}{c{m}^2}$