Mix Design Principles - Real World Applications
Q. In mix design, what does the term 'workability' refer to?
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A.
The strength of the concrete
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B.
The ease of mixing and placing concrete
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C.
The durability of the concrete
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D.
The cost of materials
Solution
Workability refers to the ease with which concrete can be mixed, placed, and finished without segregation.
Correct Answer: B — The ease of mixing and placing concrete
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Q. What is the main advantage of using lightweight aggregates in concrete?
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A.
Increased compressive strength
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B.
Reduced thermal conductivity
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C.
Lower cost
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D.
Higher water absorption
Solution
Lightweight aggregates reduce thermal conductivity, making concrete more energy-efficient.
Correct Answer: B — Reduced thermal conductivity
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Q. What is the primary function of a concrete curing compound?
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A.
To accelerate the setting time
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B.
To prevent moisture loss
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C.
To enhance color
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D.
To increase strength
Solution
The primary function of a curing compound is to prevent moisture loss from the concrete surface, ensuring proper hydration.
Correct Answer: B — To prevent moisture loss
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Q. What is the typical water-cement ratio for standard concrete mix design?
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A.
0.1 to 0.2
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B.
0.3 to 0.4
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C.
0.5 to 0.6
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D.
0.7 to 0.8
Solution
A water-cement ratio of 0.5 to 0.6 is commonly used for standard concrete mix design to achieve a good balance of strength and workability.
Correct Answer: C — 0.5 to 0.6
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Q. Which property of steel reinforcement is crucial for ensuring ductility in concrete structures?
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A.
High tensile strength
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B.
Low yield strength
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C.
High elongation
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D.
Low modulus of elasticity
Solution
High elongation in steel reinforcement is crucial for ensuring ductility, allowing structures to deform without sudden failure.
Correct Answer: C — High elongation
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Q. Which type of cement is commonly used for construction in marine environments?
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A.
Ordinary Portland Cement
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B.
Sulphate Resisting Cement
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C.
Rapid Hardening Cement
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D.
White Cement
Solution
Sulphate Resisting Cement is used in marine environments due to its resistance to sulphate attack.
Correct Answer: B — Sulphate Resisting Cement
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