Question

What will be the compressive strength of concrete if the flexural strength of concrete is 3.5 MPa?

• A. 25 MPa
• B. 12.5 MPa
• C. 25 MPa
• D. 25 MPa

Answer 1

The correct option is B 12.5 MPa

$f_{cr}=0.7{\sqrt{f}}_{ck}$
$3.5=0.7{\sqrt{f}}_{ck}$
$f_{ck}=25MPa$