Setting-Accelerator—Calcium FormateIn drying mixed building materials, such as thermal mortar, ceramic tile adhesive, cement base plaster, repair mortar, waterproof mortar and etc, in order to increase their early strength, usually high alumina cement and gypsum are used as coagulants. Antifreeze should be added under low temperature environment, calcium formate as a new type of setting-Accelerator has dual effects, it can expedite the setting-Accelerator rate of cement as well as to avoid to slow down the speed of condensation in winter construction or under low temperature and humidity, to increase the intensity of the use of cement products as early as possible, especially make great contribution for the early strength.
Calcium chloride has been used as setting-Accelerator in construction for a long time, while it has the effect of corroding steel reinforcement, chlorine-free coagulants have been developed at home and abroad. Calcium formate is an additive that has no corrosive effect on reinforcement, it mainly accelerates the hydration of tricalcium silicate in cement and increase the early strength of cement mortar. The effect of calcium formate for the strength of cement mortar mainly depends on the content of tricalcium silicate in cement. The less of tricalcium silicate, the better of the effect of early strength, it will not attenuate the later strength of cement mortar, and it can anti-freeze under low temperature.