Innovative Solutions for Sustainable Construction: Introducing Belite Sulfoaluminate Cement

The cement industry is a major emitter of CO2, accounting for approximately 8% of global CO2 emissions. In the long run, low-carbon cementitious materials will play an important role in reducing CO2 emissions in the cement industry.

Belite sulfoaluminate cement is a special type of cement that is different from traditional Portland cement. Belite sulfoaluminate cement is composed of specific mineral combinations, and its main components include belite (i.e. dicalcium silicate) and calcium sulfoaluminate (a mineral containing calcium, aluminum, sulfur, and oxygen). This type is known for its unique chemical composition and properties, with faster solidification speed, shorter solidification time, less water demand, and better corrosion resistance. It has significant advantages in certain special engineering applications. Compared with Portland cement clinker, sulfoaluminate cement clinker has a lower firing temperature (1250-1350) ℃, less limestone consumption, and better grindability, resulting in significantly reduced CO2 emissions.

TR Belite Sulphoaluminate Gelling Agent

At present, with the long-term and large-scale exploitation of natural resources, the raw materials for cement production are becoming increasingly scarce. The use of various solid wastes to replace materials such as limestone, bauxite, and natural gypsum has become a hot topic of concern for researchers. Relevant information indicates that solid waste and raw materials required for the production of building materials such as cement and concrete have similar composition and mineral properties, and are resources that have been misplaced. Therefore, using solid waste to prepare high belite sulfoaluminate cement can not only reduce carbon dioxide emissions during cement production, but also promote the resource utilization of solid waste, which is of great significance for achieving coordinated development of energy, resources, and environment. Similar to ordinary Portland cement and ordinary sulfoaluminate cement, the preparation of high belite sulfoaluminate cement still follows the process of “two grinding and one burning”, but the calcination system has been changed. Compared with ordinary Portland cement, the calcination temperature of high belite sulfoaluminate cement is 100-200 ℃ lower, which has a significant energy-saving effect.

In the context of the national “dual carbon” strategic goal, belite sulfoaluminate, as a new type of low-carbon waste utilization cement, has fast setting, high strength, micro expansion and low shrinkage performance. Its concrete has good crack resistance, impermeability and durability. The formation process of ettringite in hydration products is accompanied by micro expansion, which increases the density of the hardened slurry structure and reduces the internal porosity of the slurry, and has good development prospects.

Background of the National “Dual Carbon” Strategy Goal

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