Cement refers to a powdered hydraulic inorganic cementitious material. After adding water to the cement and stirring it into a slurry, it can be hardened in air or water to cement the sand, stone and other loose materials into mortar or concrete.
Compared with traditional Portland cement, the amount of limestone added in the production process of sulphoaluminate cement is greatly reduced, the heat consumption for decomposing CaCO3 is greatly reduced, and the CO2 emission is greatly reduced. In addition, the clinker firing temperature is low, the theoretical heat consumption is low, the firing range is wide, and energy is saved. The sulphoaluminate cement such as CSA cement is currently mainly used in: winter construction projects, emergency repair and emergency construction projects, preparation of shotcrete, production of cement products and concrete prefabricated components, preparation of shrinkage-compensating concrete and impermeability projects, production of fiber-reinforced cement products, etc.
1. The main mineral components of sulphoaluminate cement and Portland cement are different. The clinker mineral of sulphoaluminate cement is mainly anhydrous calcium sulfoaluminate. Anhydrous calcium sulfoaluminate has high hydration activity, which can rapidly hydrate and produce a certain volume expansion.
2. In terms of performance, compared with Portland cement, sulphoaluminate cement is about 20% lower in limestone dosage and about 150°C lower in firing temperature. Emission reduction is of great significance.
3. The raw materials of the modified sulphoaluminate cement can be replaced by natural raw materials such as fly ash, coal gangue, red mud, industrial gypsum, etc., which can effectively absorb and recycle industrial waste residues. This is of great significance for solving the problems of a large number of industrial wastes occupying land resources, polluting the environment, and causing potential safety hazards, and it is very consistent with the policy of vigorously developing a circular economy.