Civil Engineering - Concrete Technology

11. 

Pick up the correct statement from the following:

A. Sand obtained from pits, is washed to remove clay and silt
B. Sand obtained from flooded pits, need not be washed before use
C. Sea shore sand contains chlorides which cause effloresance
D. The chloride in sea shore sand and shingle may cause corrosion of reinforcement if the concrete is porous
E. All the above.

Answer: Option E

Explanation:

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12. 

The strength and quality of concrete, depend upon:

A. grading of aggregates
B. surface area of aggregates
C. shape of aggregates
D. surface texture of aggregates
E. all the above.

Answer: Option E

Explanation:

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13. 

The process of mixing, transporting, placing and compacting concrete using Ordinary Port land Cement should not take more than

A. 30 minutes
B. 40 minutes
C. 60 minutes
D. 75 minutes
E. 90 minutes.

Answer: Option A

Explanation:

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14. 

Pick up the incorrect statement from the following. While performing preliminary test on concrete

A. proportions of the material and water should be the same as to be used at the work site
B. cement should be mixed by hand in order to maintain uniformity
C. concrete mix should be stored in air-tight containers
D. concrete ingredients should be kept at a temperature of 37° ± 2°C
E. none of these.

Answer: Option D

Explanation:

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15. 

Sand requiring a high water cement ratio, belongs to

A. Zone I
B. Zone II
C. Zone III
D. Zone IV.

Answer: Option A

Explanation:

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