Discussion
Modulus of elasticity of concrete is increased with-
Answer: D
The modulus of elasticity of concrete increases with Increase in age.
The modulus of elasticity rises with the strength of concrete (IS 456 relates it to the square root of the characteristic strength), and strength grows with age as hydration continues.
The other three all lower strength and so lower the modulus: a higher water-cement ratio makes weaker, more porous concrete, a shorter curing period stops hydration early, and less vibration leaves air voids.
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