The role of high-efficiency retarder is to maintain good slump and fluidity of concrete. Set Retarder is an additive that reduces the hydration rate and heat of hydration of cement or gypsum and prolongs the setting time. Refer to the regulations in the national standard "Classification, Naming and Definition of Concrete Admixtures" (GB8075-2005).
For example, a certain construction site requires concrete. It takes 2 hours to deliver it from the mixing station to the construction site. If there is no retardant, the concrete will have initially set by the time it is delivered to the construction site and cannot be used. .
Using a retarder can delay the initial setting process. The purpose of adding retarder to commercial concrete is to extend 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. Concrete maintains good slump and fluidity. For example, if concrete is needed at a construction site, it will take 2 hours to deliver it from the mixing station to the construction site. If there is no retarder, the concrete will have initially set when it is delivered to the construction site. , can no longer be used
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