Mix Design Principles - Applications
Q. In the context of concrete mix design, what does the term 'workability' refer to?
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A.
The ability to resist cracking
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B.
The ease of mixing and placing concrete
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C.
The strength of the cured concrete
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D.
The thermal properties of concrete
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 fly ash as a partial replacement for cement in concrete?
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A.
Increases the weight of concrete
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B.
Improves workability and reduces permeability
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C.
Decreases the setting time
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D.
Enhances the color of concrete
Solution
Fly ash improves workability and reduces permeability, contributing to the overall durability of concrete.
Correct Answer: B — Improves workability and reduces permeability
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Q. What is the primary purpose of mix design in concrete production?
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A.
To reduce the cost of materials
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B.
To achieve desired strength and durability
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C.
To increase the workability of concrete
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D.
To minimize the environmental impact
Solution
The primary purpose of mix design is to achieve the desired strength and durability of concrete for specific applications.
Correct Answer: B — To achieve desired strength and durability
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Q. What is the purpose of using steel reinforcement in concrete structures?
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A.
To reduce the weight of concrete
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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 to improve the tensile strength of concrete, which is weak in tension.
Correct Answer: B — To improve tensile strength
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Q. What is the significance of the water-cement ratio in concrete mix design?
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A.
It affects the color of the concrete
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B.
It determines the workability and strength
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C.
It influences the curing time
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D.
It has no significant impact
Solution
The water-cement ratio is crucial as it directly affects the workability, strength, and durability of the concrete.
Correct Answer: B — It determines the workability and strength
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Q. Which factor is NOT typically considered in concrete mix design?
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A.
Water-cement ratio
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B.
Aggregate size and grading
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C.
Type of cement used
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D.
Color of the concrete
Solution
The color of the concrete is not a primary factor in mix design; the focus is on strength, durability, and workability.
Correct Answer: D — Color of the concrete
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Q. Which type of cement is commonly used for general construction purposes?
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A.
Portland cement
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B.
High alumina cement
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C.
Sulfate-resisting cement
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D.
Rapid hardening cement
Solution
Portland cement is the most commonly used type of cement for general construction due to its versatility.
Correct Answer: A — Portland cement
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