Question

Which one of the following predicts the effective modulus of elasticity of concrete?

• A. $\frac{E_c}{1+\theta }$
  where $E_c$ is short-term elastic modulus and $\theta$ is the ultimate creep coefficient
• B. $\frac{E_c}{1+2\theta }$where $E_c$ is short-term elastic modulus and $\theta$ is the ultimate creep coefficient\theta}
• C. $\frac{E_c}{1+3\theta }$
  where $E_c$ is short-term elastic modulus and $\theta$ is the ultimate creep coefficient
• D. $\frac{E_c}{1+5\theta }$
  where $E_c$ is short-term elastic modulus and $\theta$ is the ultimate creep coefficient

Answer 1

The correct option is A $\frac{E_c}{1+\theta }$

where $E_c$ is short-term elastic modulus and $\theta$ is the ultimate creep coefficient
Effective modulus of concrete or long term young's modulus of elasticity
$E_{CE}=\frac{E_c}{1+\theta }$