Building Materials
For the manufacture of Portland cement, the proportions of raw materials used, are

Silica 70% ; lime 20% ; other ingredients 10%
Lime 22% ; silica 63% ; other ingredients 15%
Lime 63% ; silica 22% ; other ingredients 15%
Silica 40% ; lime 40% ; other ingredients 20%

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

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