Generally, the temperature of commercial concrete here is about 18-24 degrees. I usually control the initial setting to 10 hours and the final setting to 12 hours under the conditions of 20 degrees in the laboratory. The condensation time should be adjusted at any time according to the temperature.
The temperature of general commercial concrete is guaranteed to be around 18-24 degrees. Final setting time is 12 hours.
Retarder: Retarder, SetRetarder, 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). The purpose of adding retarder to commercial concrete 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.
This is a retarded high-efficiency water-reducing admixture. Its initial setting time is generally about 12 hours, and its final setting time is about 16 hours. The above experimental data were collected at 20 degrees plus or minus one degree. Different types of retarded high-efficiency water-reducing admixtures have different setting times when combined with the same type of cement. Retarded and high-efficiency water-reducing admixtures from different manufacturers have different setting times when combined with the same type of cement. Therefore, the above data can only be used as a reference
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