Civil Engineering - Concrete Technology

11. 

Hardening of cement occurs at

A. rapid rate during the first few days and afterwards it continues to increase at a decreased rate
B. slow rate during the first few days and afterwards it continues to increase at a rapid rate
C. uniform rate throughout its age
D. none of these.

Answer: Option D

Explanation:

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12. 

Pick up the correct statement from the following:

A. Lime in excess, causes the cement to expand and disintegrate
B. Silica in excess, causes the cement to set slowly
C. Alumina in excess, reduces the strength of the cement
D. Magnesium oxide in excess, remains in free state and makes the cement unsound
E. All the above.

Answer: Option E

Explanation:

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13. 

Batching error means inaccuracy in the quantity of

A. aggregates
B. cement
C. water
D. all the above.

Answer: Option D

Explanation:

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14. 

Pick up the correct statement from the following i.

A. Higher workability indicates unexpected increase in the moisture content
B. Higher workability indicates deficiency of sand
C. If the concrete mix is dry, the slump is zero
D. Concrete mix having zero slump, is unsuitable for high strength.
E. All the above.

Answer: Option E

Explanation:

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15. 

You are asked to construct a massive dam, the type of cement you will use, is

A. ordinary Portland cement
B. rapid hardening cement
C. low heat cement
D. blast furnace slag cement
E. white cement.

Answer: Option C

Explanation:

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