Civil Engineering - Concrete Technology

16. 

The maximum amount of dust which may be permitted in aggregates is

A. 5% of the total aggregates for low workability with a coarse grading
B. 10% of the total aggregates for low workability with a fine grading
C. 20% of the total aggregates for a mix having high workability with fine grading
D. all the above.

Answer: Option D

Explanation:

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17. 

Proper proportioning of concrete, ensures

A. desired strength and workability
B. desired durability
C. water tightness of the structure
D. resistance to water
E. all the above.

Answer: Option E

Explanation:

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18. 

The bulk density of aggregates does not depend upon :

A. size and shape of aggregates
B. specific gravity of aggregates
C. grading of aggregates
D. size and shape of the container
E. none of these.

Answer: Option D

Explanation:

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19. 

Curing

A. reduces the shrinkage of concrete
B. preserves the properties of concrete
C. prevents the loss of water by evaporation
D. all of the above.

Answer: Option D

Explanation:

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20. 

While compacting the concrete by a mechanical vibrator, the slump should not exceed

A. 2.5 cm
B. 5.0 cm
C. 7.5 cm
D. 10 cm
E. 15 cm

Answer: Option B

Explanation:

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