According to IS 456:2000, what is the modulus of elasticity of M25 concrete?
Correct Answer: B. 25000 N/mm²
📈 Modulus of Elasticity of M25 Concrete (IS 456:2000)
Apply the IS 456:2000 formula: Ec = 5000 √fck, where fck = 25 N/mm² for M25 concrete.
Step 1 — Identify fck. For M25, fck = 25 N/mm².
Step 2 — Take the square root.√25 = 5
Step 3 — Calculate Ec.Ec = 5000 × 5 = 25000 N/mm²
The modulus of elasticity of M25 concrete is 25000 N/mm² — option B.
Key takeaway
M25 is convenient because √25 = 5 exactly. Always use Ec = 5000 √fck (IS 456:2000).