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What is retender?

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What is retender?

(a) Which speed up the initial set of concrete

(b) Which delays the initial set of concrete

(c) Which speed up the final set of concrete

(d) Which delays the final set of concrete

I have been asked this question in homework.

My doubt stems from Accelerators and Retarders topic in division Admixtures and Construction Chemicals of Concrete Technology

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The correct choice is (b) Which delays the initial set of concrete

Easy explanation: An admixture used to delay the initial set of concrete is called retender.

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