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Question

For a satisfactory workable concrete with a constant water cement ratio, increase in aggregate cement ratio -

A
Decrease the strength of concrete
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B
Does not change the strength of concrete
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C
Increase the strength of concrete
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D
None of these
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Solution

The correct option is A Decrease the strength of concrete
Aggregate cement ratio is the ratio of weight of aggregate to the weight of cement. If the ratio is more then it implies aggregates are more and cement is less. When cement is less, there will be less cement paste available to coat aggregate surfaces and fill the voids. This makes concrete pervious and decreases its strength.

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