Discussion
Assertion (A): The first few days of curing matter more than the following weeks.
Reason (R): Most of the hydration and the structure of the paste are established during that period.
Answer: C
Correct answer: Both A and R are true, and R is the correct explanation of A
Both are true and the reason gives the cause. Something like half the eventual strength develops in the first three days and around three quarters within a week, and it is in that period that the capillary network is being closed off by hydration products. Curing later cannot repair a structure that was allowed to form coarse and open, which is why the first few days are worth more than all the weeks after them.
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