there are many kinds of retarder, including sugar, lignosulfonate, hydroxy acid, inorganic salt and so on.
set retarder is an additive that reduces the hydration rate and heat of hydration of cement or gypsum and prolongs the setting time.
retarders are classified according to structure:
1. sugars: calcium sugar, glucose acid salts, etc.
2. citric acid, tartaric acid and their salts
3. zinc salts , phosphate
4. lignosulfonate
added buffer into commercial concrete the purpose of the coagulant is to prolong the hydration and hardening time of cement so that fresh concrete can maintain its plasticity for a longer period of time, thereby adjusting the setting time of fresh concrete.
there are many kinds of retarder, including sugar, lignosulfonate, hydroxy acid, inorganic salt and so on. the specific ingredient ratio process is the technology of admixture companies.
</p
