Properties of Concrete and Steel - Case Studies
Q. What is the purpose of using fly ash as a supplementary cementitious material?
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A.
To increase the weight of concrete
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B.
To improve workability and reduce permeability
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C.
To decrease the setting time
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D.
To enhance the color of concrete
Solution
Fly ash improves workability and reduces permeability, contributing to the overall durability of concrete.
Correct Answer: B — To improve workability and reduce permeability
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Q. Which property of steel is crucial for its performance in seismic design?
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A.
Ductility
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B.
Corrosion resistance
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C.
Thermal conductivity
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D.
Density
Solution
Ductility is crucial for steel performance in seismic design, allowing it to deform without breaking during an earthquake.
Correct Answer: A — Ductility
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Q. Which type of aggregate is typically used to improve the strength of concrete?
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A.
Fine aggregate
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B.
Coarse aggregate
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C.
Recycled aggregate
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D.
Lightweight aggregate
Solution
Coarse aggregate is typically used to improve the strength of concrete due to its larger size and higher load-bearing capacity.
Correct Answer: B — Coarse aggregate
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Q. Which type of cement is commonly used for underwater construction?
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A.
Ordinary Portland Cement
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B.
Rapid Hardening Cement
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C.
Sulphate Resisting Cement
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D.
Hydraulic Cement
Solution
Hydraulic Cement is commonly used for underwater construction as it sets and hardens in the presence of water.
Correct Answer: D — Hydraulic Cement
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