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Civil Engineering - Concrete Technology

Exercise : Concrete Technology - Section 4
11.
Pick up the correct statement from the following:
Sand obtained from pits, is washed to remove clay and silt
Sand obtained from flooded pits, need not be washed before use
Sea shore sand contains chlorides which cause effloresance
The chloride in sea shore sand and shingle may cause corrosion of reinforcement if the concrete is porous
All the above.
Answer: Option
Explanation:
No answer description is available. Let's discuss.
12.
The strength and quality of concrete, depend upon:
grading of aggregates
surface area of aggregates
shape of aggregates
surface texture of aggregates
all the above.
Answer: Option
Explanation:
No answer description is available. Let's discuss.
13.
The process of mixing, transporting, placing and compacting concrete using Ordinary Port land Cement should not take more than
30 minutes
40 minutes
60 minutes
75 minutes
90 minutes.
Answer: Option
Explanation:
No answer description is available. Let's discuss.
14.
Pick up the incorrect statement from the following. While performing preliminary test on concrete
proportions of the material and water should be the same as to be used at the work site
cement should be mixed by hand in order to maintain uniformity
concrete mix should be stored in air-tight containers
concrete ingredients should be kept at a temperature of 37° ± 2°C
none of these.
Answer: Option
Explanation:
No answer description is available. Let's discuss.
15.
Sand requiring a high water cement ratio, belongs to
Zone I
Zone II
Zone III
Zone IV.
Answer: Option
Explanation:
No answer description is available. Let's discuss.
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