Calcium formate is an additive without any corrosive effect on steel bars. Its molecular formula is C2H2CaO4 . It mainly accelerates the hydration of tricalcium silicate in cement and increases the early strength of cement mortar. The influence of calcium formate on the strength of cement mortar mainly depends on the content of tricalcium silicate in the cement. There is little tricalcium silicate, it will not attenuate the later strength of cement mortar, and it has a certain degree of antifreeze at low temperatures.