Civil Engineering - Concrete Technology

26. 

Cement used for normal concrete construction, is obtained by burning a mixture of

A. silicious and argillaceous materials
B. argilaceous and calcareous materials
C. silicious and catcareous materials
D. silicious, argillaceous and calcareous materials
E. none of these.

Answer: Option D

Explanation:

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27. 

Pick up the correct statement from the following:

A. The concrete gains strength due to hydration of cement
B. The concrete cured at a temperature below 23°C, gains strength up to 28 days
C. The concrete does not set at freezing point
D. The strength of concrete increases with its age
E. All the above.

Answer: Option E

Explanation:

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28. 

Pick up the incorrect statement from the following:

A. Admixtures accelerate hydration
B. Admixtures make concrete water proof
C. Admixtures make concrete acid proof
D. Admixtures give high strength
E. None of these.

Answer: Option A

Explanation:

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29. 

Higher workability of concrete is required if the structure is

A. made with cement concrete
B. thick and reinfored
C. thin and heavily reinforced
D. thick and heavily reinfored.

Answer: Option D

Explanation:

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30. 

Setting time of cement increases by adding

A. gypsum
B. hydrogen peroxide
C. calcium chloride
D. sodium oxide
E. none of these.

Answer: Option A

Explanation:

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