Civil Engineering - Concrete Technology

1. 

Concrete gains strength due to

A. chemical reaction of cement with sand and coarse aggregates
B. evaporation of water from concrete
C. hydration of cement
D. All the above.

Answer: Option C

Explanation:

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2. 

If aggregates completely pass through a sieve of size 75 mm and are retained on a sieve of size 60 mm, the particular aggregate will be flaky if its minimum dimension is less than

A. 20.5 mm
B. 30.5 mm
C. 40.5 mm
D. 50.5 mm
E. none of these.

Answer: Option C

Explanation:

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3. 

Non-uniform compaction may cause the concrete

A. porous
B. non-homogeneous
C. reduced strength
D. all the above.

Answer: Option D

Explanation:

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4. 

Log Angles machine is used to test the aggregate for

A. crushing strength
B. impact value
C. abrasion resistance
D. water absorption
E. none of these.

Answer: Option C

Explanation:

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5. 

If fineness modulus of sand is 2.5, it is graded as

A. very fine sand
B. fine sand
C. medium sand
D. coarse sand
E. very coarse sand.

Answer: Option B

Explanation:

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