Consider the following statements:
I.Modulus of elasticity of concrete increases with increase in compressive strength of concrete.
II.Brittleness of concrete increases with decrease in compressive strength of concrete.
III.Shear strength of concrete increases with increase in compressive strength of concrete.
Which of the following statements are TRUE?
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A.
I and II
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B.
I, II and III
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C.
II and III
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D.
I and III
Correct Answer:
A. I and II
Explanation:
Statement I is correct because the modulus of elasticity is directly related to the density and quality of the concrete matrix, which improves as compressive strength increases. Statement III is also correct as the internal cohesion and tensile resistance of concrete, which determine shear capacity, typically improve in higher-strength mixes. Statement II is incorrect because higher-strength concrete is actually more brittle; lower-strength concrete exhibits more ductile behavior before failure. Therefore, statements I and III are the only true options.
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