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Retarding Agent
Aug 21, 2018

Retarder is a kind of additive which reduces the hydration speed and hydration heat of cement or gypsum and prolongs the setting time.

Classification by structure:

(1) Carbohydrate: sugar calcium, glucose, acid salt, etc.

(2) citrate, tartaric acid and its salts

(3) zinc salt, phosphate 

(4) Wood sulfonate


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