Civil Engineering - Concrete Technology

16.
The maximum amount of dust which may be permitted in aggregates is
5% of the total aggregates for low workability with a coarse grading
10% of the total aggregates for low workability with a fine grading
20% of the total aggregates for a mix having high workability with fine grading
all the above.
Answer: Option
Explanation:
No answer description is available. Let's discuss.

17.
Proper proportioning of concrete, ensures
desired strength and workability
desired durability
water tightness of the structure
resistance to water
all the above.
Answer: Option
Explanation:
No answer description is available. Let's discuss.

18.
The bulk density of aggregates does not depend upon :
size and shape of aggregates
specific gravity of aggregates
grading of aggregates
size and shape of the container
none of these.
Answer: Option
Explanation:
No answer description is available. Let's discuss.

19.
Curing
reduces the shrinkage of concrete
preserves the properties of concrete
prevents the loss of water by evaporation
all of the above.
Answer: Option
Explanation:
No answer description is available. Let's discuss.

20.
While compacting the concrete by a mechanical vibrator, the slump should not exceed
2.5 cm
5.0 cm
7.5 cm
10 cm
15 cm
Answer: Option
Explanation:
No answer description is available. Let's discuss.