Discussion
Assertion (A): Concrete remains workable for a period after mixing before stiffening fairly suddenly.
Reason (R): A dormant period of low reaction rate follows the initial burst on wetting.
Answer: C
Both are true and the reason gives the cause: the dormant period is what makes transport and placing possible at all, and its length is one of the things admixtures are used to adjust. Retarders lengthen it and accelerators shorten it as the job requires.
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