1. Setting time
Calcium chloride is mainly used as an accelerator for concrete, which can greatly shorten the initial and final setting time of concrete. It is mainly used at high temperature to speed up concrete pouring and obtain finished concrete slabs as soon as possible. However, it is not recommended to use an accelerator in hot weather, otherwise the concrete will set quickly and it will be difficult to successfully complete the concrete pouring.
2. Water cement ratio
Calcium chloride will not significantly land to reach the water required to reduce the slump to a given degree, nor will it make the concrete strength conductive. As an accelerator, it can make concrete harden earlier and reduce pressurized water.
The use of calcium chloride in concrete will not produce air-entraining effect, but when used together with air-entraining agent, it can reduce the amount of air-entraining agent while generating a small amount of gas.
4. Freeze and Thaw
When pouring concrete in winter, it may be necessary to use deicing salt on the material, so this is important. The frost resistance of mature concrete containing calcium chloride may decrease in the later stage.
5. Dry shrinkage
Absolutely, calcium chloride will increase drying shrinkage. The amount of drying shrinkage determines the amount of calcium chloride added, the type of cement, curing time and environmental conditions.
Due to the use of calcium chloride, in some cases, white precipitates will form on the surface of the cured concrete. However, under normal conditions, this white precipitate will absorb water and will not cause efflorescence like other salts. These white precipitates do not degrade water and can be removed with dilute hydrochloric acid.