Properties of Concrete and Steel - Higher Difficulty Problems
Q. What is the effect of adding silica fume to concrete?
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A.
Increases permeability
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B.
Reduces strength
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C.
Improves durability and strength
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D.
Decreases workability
Solution
Silica fume improves the durability and strength of concrete by filling voids and enhancing the bond between particles.
Correct Answer: C — Improves durability and strength
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Q. What is the typical yield strength of structural steel used in construction?
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A.
100 MPa
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B.
250 MPa
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C.
400 MPa
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D.
600 MPa
Solution
The typical yield strength of structural steel used in construction is around 400 MPa, depending on the grade.
Correct Answer: C — 400 MPa
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Q. Which aggregate size is generally preferred for high-strength concrete?
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A.
Fine aggregates only
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B.
Coarse aggregates only
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C.
A mix of fine and coarse aggregates
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D.
No aggregates are needed
Solution
A mix of fine and coarse aggregates is preferred to optimize the packing density and strength of high-strength concrete.
Correct Answer: C — A mix of fine and coarse aggregates
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Q. Which type of cement is best suited for high-temperature environments?
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A.
Ordinary Portland Cement
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B.
Sulphate Resisting Cement
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C.
High Alumina Cement
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D.
Rapid Hardening Cement
Solution
High Alumina Cement is designed to withstand high temperatures and is suitable for refractory applications.
Correct Answer: C — High Alumina Cement
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