Question

The modulus of elasticity of concrete is approximately:

• A. 10,000 MPa
• B. 20,000 MPa
• C. 30,000 MPa
• D. 40,000 MPa

Hint:

The modulus of elasticity for normal concrete is typically around 20,000 MPa. It can vary depending on concrete strength and material composition.

Answer 1

The Correct Option is B

The modulus of elasticity, also known as Young's Modulus, is a material property that describes the relationship between stress and strain. In concrete, the modulus of elasticity is influenced by factors such as the type of cement, aggregates, and the mix ratio. 
Step 1: Concrete's Modulus of Elasticity Range. 
Concrete generally has a modulus of elasticity in the range of 20,000 MPa to 40,000 MPa. The exact value depends on the material composition, but the typical value used for general purposes is approximately 20,000 MPa. 
Step 2: Consideration of Option Values. 
(a) \( 10,000 \) MPa: Too low for typical concrete.
(b) \( 20,000 \) MPa: This is a common value used for concrete's modulus of elasticity.
(c) \( 30,000 \) MPa: This is also a reasonable value but higher than the typical value.
(d) \( 40,000 \) MPa: This is on the higher side but still within the possible range for concrete with high strength. 
Step 3: Conclusion. 
Considering the average and typical values used in the construction industry, the most appropriate answer is \( 20,000 \) MPa. Thus, the correct answer is (b) 20,000 MPa.