Civil Engineering - Concrete Technology

6. 

1.S. Sieve Nos. 10 mm and 4.75 mm are geneally used for grading of

A. coarse aggregates
B. fine aggregates
C. neither (a) nor (b)
D. both (a) and (b)
E. none of these.

Answer: Option D

Explanation:

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7. 

Pick up the correct statement from the following:

A. The free water is the amount of water added while mixing and the amount of water held on the surface of the aggregates prior to mixing
B. The total water is the free water and the amount actually absorbed by the aggregates
C. Neither (a) nor (b)
D. Both (a) and (b).

Answer: Option D

Explanation:

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8. 

Addition of pozzolana to ordinary port land cement, causes

A. decrease in early strength
B. reduction in chemical action with sulphates
C. increase in shrinkage
D. reduction bleeding
E. all the above.

Answer: Option E

Explanation:

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9. 

Too wet concrete may cause

A. weakness of concrete
B. excessive laitance
C. segregation
D. lower density
E. all the above.

Answer: Option E

Explanation:

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10. 

Addition of pozzolana to cement causes

A. reduction in permeability
B. loss of heat of hydration
C. reduction in bleeding
D. increase in curing time
E. all the above.

Answer: Option E

Explanation:

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