Question

Modulus of elasticity of M 25 concrete as determined by formula of IS:456 is

• A. 1,24,500 MPa
• B. 90,125 MPa
• C. 28,500 MPa
• D. 16,667 MPa

Answer 1

The correct option is C 28,500 MPa

The modulus of elasticity as per IS:456-1978
$E_c=5700\sqrt{f_{ck}}N/m{m}^2$
The modulus of elasticity as per IS:456-2000
$E_c=5000\sqrt{f_{ck}}N/m{m}^2$
For M25
$E_c=5700\sqrt{f_{ck}}=28,500MPa$
$E_c=5000\sqrt{f_{ck}}=25,000MPa$