Civil Engineering - Concrete Technology

21. 

Percentage of pozzolanic material containing clay upto 80% used for the manufacture of pozzolana cement, is

A. 30%
B. 40%
C. 50%
D. 60%
E. 70%

Answer: Option A

Explanation:

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22. 

For batching 1:3:6 concrete mix by volume, the ingredients required per bag of 50 kg cement, are:

A. 70 litres of sand and 120 litres of aggregates
B. 70 kg of sand and 140 litres of aggregates
C. 105 litres of sand and 140 litres of aggregates
D. 105 litres of sand and 210 litres of aggregates
E. none of these.

Answer: Option D

Explanation:

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23. 

The process of hardening the concrete by keeping its surface moist is known

A. placing
B. wetting
C. curing
D. compacting
E. none of these.

Answer: Option C

Explanation:

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24. 

The grade of concrete not recommended by I.S. : 456, is

A. M 100
B. M 200
C. M 300
D. M 400
E. M 500

Answer: Option E

Explanation:

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25. 

C.R.R.I. charts are used to obtain a relatioship between strength of concrete and

A. water cement ratio
B. workability
C. grading of aggregate
D. fineness modulus
E. none of these.

Answer: Option A

Explanation:

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