Mix Design Principles
Q. In concrete mix design, what does the term 'workability' refer to?
A.
The strength of the concrete
B.
The ease of mixing and placing concrete
C.
The durability of the concrete
D.
The cost of the concrete mix
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Solution
Workability refers to the ease of mixing, transporting, placing, and finishing concrete without segregation.
Correct Answer: B — The ease of mixing and placing concrete
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Q. What is the primary function of coarse aggregates in concrete?
A.
To provide color
B.
To reduce shrinkage
C.
To provide bulk and strength
D.
To enhance workability
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Solution
Coarse aggregates provide bulk and strength to concrete, making it more durable.
Correct Answer: C — To provide bulk and strength
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Q. What is the primary purpose of mix design in concrete?
A.
To reduce the cost of materials
B.
To achieve desired strength and durability
C.
To increase the workability of concrete
D.
To minimize the environmental impact
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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 role of admixtures in concrete mix design?
A.
To increase the weight of concrete
B.
To modify the properties of concrete
C.
To reduce the curing time
D.
To enhance the color of concrete
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Solution
Admixtures are used to modify the properties of concrete, such as workability, setting time, and durability.
Correct Answer: B — To modify the properties of concrete
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Q. What is the significance of the 'cement content' in concrete mix design?
A.
It determines the color of the concrete
B.
It affects the workability and strength of concrete
C.
It influences the curing time
D.
It has no significant impact
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Solution
Cement content significantly affects the workability, strength, and durability of concrete.
Correct Answer: B — It affects the workability and strength of concrete
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Q. Which aggregate size is typically preferred for high-strength concrete?
A.
Fine aggregates only
B.
Coarse aggregates only
C.
A mix of fine and coarse aggregates
D.
Any size of aggregates
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Solution
A mix of fine and coarse aggregates is preferred for high-strength concrete to achieve optimal packing and strength.
Correct Answer: C — A mix of fine and coarse aggregates
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Q. Which of the following factors does NOT affect the water-cement ratio in concrete mix design?
A.
Type of cement used
B.
Environmental conditions
C.
Size of aggregates
D.
Color of the concrete
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Solution
The color of the concrete does not affect the water-cement ratio; it is influenced by the type of cement, environmental conditions, and aggregate size.
Correct Answer: D — Color of the concrete
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Q. Which of the following is a common method for determining the water-cement ratio?
A.
Trial and error method
B.
Empirical formulas
C.
Laboratory testing only
D.
Visual inspection
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Solution
The trial and error method is commonly used to determine the optimal water-cement ratio for specific concrete requirements.
Correct Answer: B — Empirical formulas
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Q. Which type of cement is commonly used for high-performance concrete?
A.
Ordinary Portland Cement
B.
Rapid Hardening Cement
C.
Sulphate Resisting Cement
D.
High Alumina Cement
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Solution
Ordinary Portland Cement is commonly used for high-performance concrete due to its versatility and strength.
Correct Answer: A — Ordinary Portland Cement
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