Civil Engineering - Concrete Technology

46. 

Segregation is responsible for

A. honey-combed concrete
B. porous layers in concrete
C. surface scaling in concrete
D. sand streaks in concrete
E. all the above.

Answer: Option E

Explanation:

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47. 

Addition of pozzolana to cement

A. decreases workability
B. increases strength
C. increases heat of hydration
D. decreases curing time
E. none of these.

Answer: Option E

Explanation:

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48. 

The datum temperature for maturity by Plowman, is

A. 23°C
B.
C. - 5.6°C
D. - 11.7°C

Answer: Option D

Explanation:

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49. 

Pick up the incorrect statement from the following:

A. The degree of grinding of cement, is called fineness
B. The process of changing cement paste into hard mass, is known as setting of cement
C. The phenomenon by virtue of which cement does not allow transmission of sound, is known as soundness of cement
D. The heat generated during chemical reaction of cement with water, is known as heat of hydration
E. None of these.

Answer: Option C

Explanation:

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