关键词: 高贝利特硫铝酸盐水泥;无水硫铝酸钙;水化性能;水化产物;微观结构

Abstract: The hydration performance of a new type rapid setting and hardening high belite sulfoaluminate (HB-CSA) cement had been studied, with the methods of Isothermal Calorimetry, XRD, TGA and SEM, to determine the compositions of hydration products and microstructure features.The experimental results show that the new type high belite calcium sulfoaluminate cement clinker''s early hydration heat evolution is exothermic and concentrated, with higher and quicker early strength development.AFt and aluminum hydroxide gel make up the dominating compositions of cement early hydration products, while no CH phase can be detectable.Another finding is that the generated AFt phase transformation to produce the AFm phase would happen in late hydration ages, with no CH phase be noticed yet.Along with the ongoing hydration, an increasingly number of hydration products are generated and needle-like AFt phase could cross, interlock between amorphous gel to form a relatively dense structure, thus leading to the mechanical strength development of cement.

Key words: high belite calcium sulfoaluminate cement;anhydrous calcium sulphoaluminate;hydration property;hydration product;microstructure