Mix Design Principles - Competitive Exam Level
Q. What is the main function of fly ash in concrete?
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A.
To increase the density
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B.
To reduce shrinkage
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C.
To enhance workability
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D.
To improve long-term strength
Solution
Fly ash is used in concrete to improve long-term strength and durability, as well as to enhance workability.
Correct Answer: D — To improve long-term strength
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Q. What is the maximum size of coarse aggregate typically used in concrete mix design?
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A.
10 mm
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B.
20 mm
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C.
40 mm
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D.
50 mm
Solution
The maximum size of coarse aggregate used in concrete mix design is typically 20 mm, but can go up to 40 mm depending on the application.
Correct Answer: C — 40 mm
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Q. What is the primary purpose of using admixtures in concrete?
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A.
To increase the strength of concrete
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B.
To improve workability
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C.
To reduce water content
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D.
To enhance durability
Solution
Admixtures are used to improve the workability of concrete, making it easier to mix, place, and finish.
Correct Answer: B — To improve workability
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Q. What is the primary role of coarse aggregate in concrete?
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A.
To bind the mix
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B.
To provide volume and stability
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C.
To enhance color
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D.
To reduce cost
Solution
Coarse aggregate provides volume and stability to the concrete mix, contributing to its overall strength.
Correct Answer: B — To provide volume and stability
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Q. What is the water-cement ratio for achieving a good quality concrete mix?
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A.
0.2 to 0.3
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B.
0.4 to 0.5
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C.
0.6 to 0.7
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D.
0.8 to 0.9
Solution
A water-cement ratio of 0.4 to 0.5 is generally considered optimal for achieving good quality concrete.
Correct Answer: B — 0.4 to 0.5
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Q. Which material is primarily used to improve the tensile strength of concrete?
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A.
Cement
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B.
Steel reinforcement
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C.
Fine aggregate
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D.
Admixtures
Solution
Steel reinforcement is primarily used to improve the tensile strength of concrete, as concrete is weak in tension.
Correct Answer: B — Steel reinforcement
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Q. Which of the following is a common type of chemical admixture used in concrete?
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A.
Plasticizer
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B.
Sand
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C.
Gravel
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D.
Cement
Solution
Plasticizers are a common type of chemical admixture used to improve the workability of concrete.
Correct Answer: A — Plasticizer
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