In pre-stressed concrete, high grade concrete is used for -
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A.
Having concrete of low ductility
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B.
Having Low creep
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C.
Having concrete of high brittleness
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D.
Controlling the pre-stress loss
Correct Answer:
B. Having Low creep
Explanation:
In pre-stressed concrete, high-grade concrete is essential because it possesses a higher modulus of elasticity and a denser microstructure, which significantly reduces time-dependent deformations. Among the primary factors contributing to the loss of pre-stressing force are creep and shrinkage. High-grade concrete exhibits much lower creep under sustained compressive loads compared to lower-grade concrete. By utilizing a material with low creep characteristics, engineers can minimize the reduction of the initial pre-stress force over the structure's lifespan, ensuring the member maintains its intended load-carrying capacity and crack resistance. While high-grade concrete is also more brittle and less ductile, these are incidental properties rather than the primary reason for its selection in pre-stressing applications.
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