Mix Design Principles - Case Studies
Q. What is the main advantage of using fly ash as a partial replacement for cement?
A.
Increases the weight of concrete
B.
Improves workability and reduces permeability
C.
Decreases the setting time
D.
Increases the cost of concrete
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Solution
Fly ash improves workability, reduces permeability, and can enhance the long-term strength of concrete when used as a partial replacement for cement.
Correct Answer: B — Improves workability and reduces permeability
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Q. What is the role of water in cement hydration?
A.
To cool the mixture
B.
To activate the chemical reaction
C.
To increase the volume of concrete
D.
To reduce the setting time
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Solution
Water is essential for activating the chemical reaction in cement hydration, which leads to the hardening of concrete.
Correct Answer: B — To activate the chemical reaction
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Q. Which factor is NOT considered in the mix design of concrete?
A.
Environmental conditions
B.
Type of structure
C.
Color of the concrete
D.
Load requirements
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Solution
The color of the concrete is not a factor considered in the structural mix design; rather, environmental conditions, type of structure, and load requirements are critical.
Correct Answer: C — Color of the concrete
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Q. Which type of cement is commonly used for construction in aggressive environments?
A.
Ordinary Portland Cement
B.
Sulphate Resisting Cement
C.
Rapid Hardening Cement
D.
White Cement
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Solution
Sulphate Resisting Cement is specifically designed to withstand aggressive environments, particularly those with high sulphate content.
Correct Answer: B — Sulphate Resisting Cement
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