With the progress of The Times, retarder also has a qualitative leap. Sodium hexametaphosphate is the retarder commonly used in polycarboxysalt. It is a kind of admixture that can delay cement hydration reaction, so as to prolong the setting time of concrete, so that the fresh concrete in a long time to maintain plasticity, convenient pouring, improve construction efficiency, and at the same time, the performance of concrete in the late period will not cause adverse effects.

Sodium hexametaphosphate is applied in concrete, mainly in the concrete admixture to add sodium hexametaphosphate for compounding, can make the concrete workability is good, no secreting water, so that the later working performance of concrete has been guaranteed. The admixture of sodium hexametaphosphate CONCRETE is especially suitable for machinesand concrete with high amount of mud and stone powder, which can greatly improve the mechanical properties and construction performance of machinesand concrete, complexing calcium ions and increasing its solubility, so as to obtain retarding effect.

In summer concrete construction and large volume concrete construction mixed with retarding agent can not only delay the concrete set time, but also delay cement hydration fever, reduce the temperature stress caused by hydration heat and make concrete crack construction accident.

The main bonding mechanism of sodium hexametaphosphate, sodium hexametaphosphate after absorbing water in viscose, it has close relationship with the properties of sodium hexametaphosphate itself, the formula for sodium hexametaphosphate belongs to a kind of composition of phosphate, sodium hexametaphosphate anion has a high molecular weight, generally contain PO3 gene number is as high as 20-100, and form a long chain.