Calcium formate early strength agent can improve concrete performance and increase construction efficiency

In the historical construction and construction engineering systems, the production and application of early strength agents are relatively extensive. At present, my country's use of early strength agents and early strength water reducing agents is also hundreds of thousands of tons. However, with the deepening of people's understanding of the potential harm of chloride ions, sulfate ions and alkali metal ions on the performance and long-term stability of concrete, calcium formate early strength agent can not only play a good early strength effect, but also avoid The advantages of some early strength components causing corrosion of steel reinforcement in concrete have been recognized.

Calcium formate as an organic early strength agent, its unique properties can accelerate the hydration of cement and improve the early strength of mortar. Choosing the right calcium formate variety and dosage is crucial to whether it can play its due role in concrete mortar.

Experiments can draw the following conclusions:
(1) Calcium formate can increase the early strength and has the effect of reducing water.
(2) The solubility of calcium formate and its dispersion in the mortar have a significant effect on the early strength of the dry powder mortar.
(3) In masonry mortar, the amount of calcium formate is generally 2% to 3%, and the amount of calcium formate in plastering mortar: summer consumption is generally about 0.3% to 0.5%, winter dosage is generally about 0.5% to 1.0% .
(4) When the content of calcium formate is 0% to 1.5%, the bonding strength of the plaster mortar gradually increases with the increase of its content. However, when the admixture is too high, it will set too fast or even set quickly, which will cause cracking in the later stage of the plaster and reduce its strength. So pay attention to the actual amount.

The development of concrete strength and its comprehensive performance is inseparable from the use of additives. Like other building materials, the green production of concrete additives has been paid more and more attention. Calcium formate is a new type of low-temperature early strength agent. Formic acid is a weak acid and there is a process of hydrolysis in aqueous solution. So the aqueous solution of calcium formate should be weakly alkaline and can also be used in reinforced concrete. It will not corrode the building materials and will not harm the environment.

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