Civil Engineering - Concrete Technology

26. 

Proper batching ensures

A. economy
B. durability
C. workability
D. strength
E. all the above.

Answer: Option E

Explanation:

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27. 

Workability of concrete for a given water content is good if the aggregates, are

A. rounded aggregate
B. irregular aggregate
C. angular aggregate
D. flaky aggregates.

Answer: Option A

Explanation:

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28. 

Pick up the correct statement from the following:

A. Bulking of sand is caused due to formation of a thin film of surface moisture
B. Fine sand bulks more than coarse sand
C. With 10% moisture content by weight, the bulking of sand is increased by 50%.
D. The volume of fully saturated sand, is equal to the volume of dry and loose sand
E. All the above.

Answer: Option E

Explanation:

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29. 

For compacting plain concrete road surface of thickness less than 20 cm, we use

A. internal vibrator
B. screed vibrator
C. form vibrator
D. none of these.

Answer: Option B

Explanation:

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30. 

Pick up the correct statement from the following:

A. Construction joints are necessarily planned for their locations
B. Expansion joints are provided to accommodate thermal expansion
C. Construction joints are provided to control shrinkage cracks
D. Expansion joints need not be provided in foundation concrete
E. All the above.

Answer: Option E

Explanation:

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