When a specimen of M25 concrete is loaded to a stress level of 12.5 MPa, a strain of 500×10-6 is recorded. If this load is allowed to stand for a long time

Q. When a specimen of M25 concrete is loaded to a stress level of 12.5 MPa, a strain of 500×10^-6 is recorded. If this load is allowed to stand for a long time, the strain increases to 1000×10-6. In accordance with the provisions of IS:456-2000, considering the long-term effects, the effective modulus of elasticity of the concrete (in MPa) is   

 Solution:
Short term strain =500×10⁻⁶
Long term strain =1000×10⁻⁶                                  

So, creep coefficient,