Properties of Concrete and Steel - Applications
Q. What is the effect of using fly ash as a partial replacement for cement in concrete?
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A.
Increases setting time
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B.
Reduces workability
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C.
Enhances long-term strength
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D.
Decreases durability
Solution
Using fly ash as a partial replacement for cement can enhance the long-term strength and durability of concrete.
Correct Answer: C — Enhances long-term strength
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Q. What is the primary advantage of using lightweight aggregates in concrete?
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A.
Increased thermal conductivity
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B.
Reduced weight of concrete
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C.
Higher compressive strength
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D.
Lower cost
Solution
Lightweight aggregates reduce the weight of concrete, making it suitable for applications where weight is a concern.
Correct Answer: B — Reduced weight of concrete
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Q. What is the primary purpose of curing concrete after placement?
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A.
To increase the temperature
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B.
To prevent moisture loss
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C.
To enhance color
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D.
To reduce weight
Solution
Curing concrete is essential to prevent moisture loss, which is critical for achieving the desired strength and durability.
Correct Answer: B — To prevent moisture loss
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Q. What is the primary purpose of using steel reinforcement in concrete structures?
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A.
To reduce the weight of the structure
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B.
To improve tensile strength
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C.
To enhance thermal insulation
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D.
To increase workability
Solution
Steel reinforcement is used in concrete to improve its tensile strength, as concrete is strong in compression but weak in tension.
Correct Answer: B — To improve tensile strength
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Q. Which property of concrete is primarily affected by the water-cement ratio?
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A.
Compressive strength
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B.
Thermal conductivity
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C.
Color
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D.
Density
Solution
The water-cement ratio significantly influences the compressive strength of concrete; lower ratios generally lead to higher strength.
Correct Answer: A — Compressive strength
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Q. Which property of steel is crucial for its use in construction?
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A.
High thermal expansion
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B.
Low tensile strength
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C.
High ductility
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D.
Low corrosion resistance
Solution
High ductility is a crucial property of steel, allowing it to deform under stress without breaking, which is essential in construction.
Correct Answer: C — High ductility
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Q. Which type of aggregate is typically used to improve the durability of concrete?
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A.
Fine aggregates
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B.
Coarse aggregates
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C.
Recycled aggregates
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D.
Lightweight aggregates
Solution
Coarse aggregates are typically used to improve the durability of concrete by providing better structural integrity.
Correct Answer: B — Coarse aggregates
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