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Question

Identify the correct statement which corresponds to accelarator retarder.

A
CaCl2:CaSO4
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B
NaOH:KOH
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C
NaCl:CaCl2
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D
KOH:NaOH
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Solution

The correct option is A CaCl2:CaSO4
Retarder is used to slow down the setting rate of concrete which is used to counteract the accelerating effect of hot weather on concrete setting. Ex. CaSO4.
Accelerators make concrete set faster rapidly after mixing with concrete. As high temperature after cause an increased rate of hardening which makes placing and finishing difficult. Ex. -CaCl2

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