Properties of Concrete and Steel - Advanced Concepts
Q. What is the main advantage of using steel reinforcement in concrete?
A.
Increases thermal insulation
B.
Improves tensile strength
C.
Reduces weight of the structure
D.
Enhances aesthetic appeal
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Solution
Steel reinforcement is used in concrete to improve its tensile strength, as concrete is weak in tension.
Correct Answer: B — Improves tensile strength
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Q. What is the typical water-cement ratio for achieving maximum strength in concrete?
A.
0.2
B.
0.4
C.
0.5
D.
0.7
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Solution
A water-cement ratio of around 0.5 is generally considered optimal for achieving maximum strength in concrete.
Correct Answer: C — 0.5
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Q. Which aggregate size is typically used for structural concrete?
A.
Fine aggregates only
B.
Coarse aggregates only
C.
A mix of fine and coarse aggregates
D.
No aggregates are used
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Solution
Structural concrete typically uses a mix of fine and coarse aggregates to achieve the desired strength and workability.
Correct Answer: C — A mix of fine and coarse aggregates
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Q. Which property of concrete is primarily affected by the type of aggregate used?
A.
Compressive strength
B.
Thermal conductivity
C.
Color
D.
Workability
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Solution
The type of aggregate used in concrete significantly affects its compressive strength, as different aggregates have different strength characteristics.
Correct Answer: A — Compressive strength
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Q. Which type of cement is known for its high early strength?
A.
Ordinary Portland Cement
B.
Rapid Hardening Cement
C.
Low Heat Cement
D.
Sulphate Resisting Cement
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Solution
Rapid Hardening Cement is designed to achieve high strength in a short period, making it suitable for quick construction.
Correct Answer: B — Rapid Hardening Cement
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