Civil Engineering - Concrete Technology

31. 

Pick up the correct statement from the following:

A. Segregation is necessary for a workable concrete
B. Consistency does not affect the workability of concrete
C. If the slump increases, workability decreases
D. If the concrete mix is dry, the slump is maximum
E. None of these.

Answer: Option E

Explanation:

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32. 

Specified compressive strengh of concrete is obtained from cube tests at the end of

A. 3 days
B. 7 days
C. 14 days
D. 21 days
E. 28 days.

Answer: Option E

Explanation:

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33. 

An aggregate is said to be flaky, if its least dimension is less than

A. 2/3 mean dimension
B. 3/4 mean dimension
C. 3/5 mean dimension
D. 5/8 mean dimension
E. none of these.

Answer: Option C

Explanation:

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34. 

Pick up the incorrect statement from the following:

A. A rich mix of concrete possesses higher strength than that a lean mix of desired workability with excessive equantity of water
B. The strength of concrete decreases as the water cement ratio increases
C. If the water cement ratio is less than 0.45, the concrete is not workable and causes honey-combed structure
D. Good compaction by mechanical vibrtions, increases the strength of concrete
E. None of these.

Answer: Option A

Explanation:

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35. 

The percentage of the aggregate of F.M. 2.6 to be combined with coarse aggregate of F.M. 6.8 for obtaining the aggregates of F.M. 5.4, is

A. 30%
B. 40%
C. 50%
D. 60%.

Answer: Option C

Explanation:

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