Building Materials
The basic purpose of a retarder in concrete is

To increase the initial setting time of cement paste in concrete
To improve the workability of concrete mix
To render the concrete more water tight
To decrease the initial setting time of cement paste in concrete

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Building Materials
Assertion A : Pure lime takes a long time to develop adequate strength.Reason R : Pure lime has slow hardening characteristics.Select your answer according to the coding system given below:

A is true but R is false
Both A and R is true and R is correct explanation of A
A is false but R is true
Both A and R is true and R is not a correct explanation of A

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