Civil Engineering - Concrete Technology

26. 

To ensure constant moisture content in aggregates

A. area of each aggregate pile should be large
B. height of each aggregate pile should not exceed 1.50 m
C. aggregate pile should be left for 24 hours before aggregates are used
D. conical heaps of aggregates should be avoided to prevent moisture variation
E. all the above.

Answer: Option E

Explanation:

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27. 

Workability improved by adding

A. air-entraining agent
B. foaming agent
C. oily-agent
D. aluminium compound
E. all the above.

Answer: Option E

Explanation:

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28. 

The commonly used material in the manufacture of cement is

A. sand stone
B. slate
C. lime stone
D. graphite.

Answer: Option C

Explanation:

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29. 

If 20 kg of coarse aggregate is sieved through 80 mm, 40 mm, 20 mm, 10 mm, 4.75 mm, 2.36 mm, 1.18 mm, 600 micron, 300 micron and 150 micron standard sieves and the weights retained are 0 kg, 2 kg, 8 kg, 6 kg, 4 kg respectively, the fineness modulus of the aggregate, is

A. 7.30
B. 7.35
C. 7.40
D. 7.45
E. none of these.

Answer: Option C

Explanation:

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30. 

Curing a concrete for long period ensures better

A. volume stability
B. strength
C. water resistance
D. water tightness and durability
E. all the above.

Answer: Option E

Explanation:

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