Question

Compressive strength of any structural concrete sample should not be less than specified characteristic compressive strength minus.

• A. $5\text{MPa}$
• B. $3\text{MPa}$
• C. $1\text{MPa}$
• D. $10\text{MPa}$

Answer 1

The correct option is B $3\text{MPa}$

The strength of any sample is not less than the specified characteristic compressive strength minus $3\text{MPa}\left(N/m{m}^2\right)$.

The mean strength determined from any group of $4$ consecutive sample exceed the specific characteristic compressive strength of $3\text{MPa}\left(N/m{m}^2\right)$.