Civil Engineering MCQJE Level Civil Engineering
The modulus of elasticity (Ec) of concrete as per IS 456 is given by:
Building MaterialsBuilding MaterialsMEDIUM
Choose the correct answer
A
Ec = 200,000 MPa (same as steel)
B
Ec = 5000√fck MPa
C
Ec = fck/0.5
D
Ec = 10,000 MPa always
Correct Answer
B. Ec = 5000√fck MPa
Why is this the answer?
IS 456 Cl. 6.2.3.1: Ec = 5000√fck (MPa) where fck = characteristic cube strength. For M25: Ec = 5000√25 = 25,000 MPa = 25 GPa. This is approximate; actual Ec depends on aggregate type and moisture. For M30: Ec = 5000√30 ≈ 27,386 MPa.
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