"325 cement" is just a popular saying in the market, and does not refer to a specific cement variety. R in cement label indicates early strength type, for example, P.O32.5R indicates early strength type ordinary portland cement with strength grade of 32.5. The strength grades of ordinary cement are cancelled from 32.5 and 32.5 R, so the only 325 cements on the market now are slag portland cement, pozzolanic portland cement, fly ash portland cement and composite portland cement. Portland cement No.325 and ordinary Portland cement are gone. trait

325 cement

According to the main hydraulic substance of cement: Portland cement (mainly hydraulic)

The sexual substance is calcium silicate), aluminate cement (the main hydraulic substance is calcium aluminate) and sulfur.

Aluminate cement (the main hydraulic substance is calcium sulphoaluminate), etc. Because of their different hydraulic substances, their properties are also different, such as aluminate cement with fast setting speed. High early strength, good heat resistance and sulfate corrosion resistance; Volume of harden sulphoaluminate cement

Will expand and so on. use

According to the use of cement, it is divided into: general cement (used in general construction projects, mainly

Five kinds of portland cement), special cement (refers to water suitable for special purposes

Mud, including dam cement, oil well cement and masonry cement. Special cement (cement with some outstanding properties, such as expansive cement, low-heat cement, colored cement, white cement, etc.). ).