Civil Engineering - Concrete Technology

21. 

An excess of flaky particles in concrete aggregates

A. decreases the workability
B. increases the quantity of water and sand
C. affects the durability of concrete
D. more than 15% are not desirable
E. all the above.

Answer: Option E

Explanation:

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22. 

1.S.I. has specified the full strength of concrete after

A. 7 days
B. 14 days
C. 21 days
D. 28 days
E. 35 days

Answer: Option D

Explanation:

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23. 

For given workability the grading requiring the least amount of water is one that gives

A. greatest surface area for the given cement and aggregates
B. least surface area for the given cement and aggregates
C. least weight for the given cement and aggregates
D. greatest weight for the given cement and aggregates
E. none of these.

Answer: Option A

Explanation:

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24. 

The minimum percentage of chemical ingredient of cement is that of

A. magnesium oxide
B. iron oxide
C. alumina
D. lime
E. silica.

Answer: Option A

Explanation:

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25. 

The specifications of a cement bag for storage, are

A. weight 50 kg
B. height 18 cm
C. plan area 3000 sq. cm
D. volume 35 litres
E. all the above.

Answer: Option E

Explanation:

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