Effect of Anhydrite on the Early Hydration Performance of Rapid Setting and Hardening Belite Sulfoaluminate Cement

Abstract:

In order to investigate the early hydration behavior of rapid setting and hardening belite sulfoaluminate cements, the methods of X-ray Diffraction, Scanning Electron Microscope, Compressive Strength test and Setting Times test were used to identify and quantify the hydration kinetics and microstructure of this new-found cements in China. The results showed that the main mineral compositions of high belite sulfoaluminate cement clinker included calcium sulfoaluminate (4CaO·3Al₂O₃·CaSO₄), belite (2CaO·SiO₂), ferrite phase, free gypsum and free lime. It was found that not only the setting time and compressive strength but also the composition of hydration products were influenced by anhydrite to some extent. Meanwhile, a mass of AFt and AFm generated along with the hydration process at different ages, overlapped, crossed and penetrated through calcium silicate hydrate gel and aluminum oxide to form a relatively dense structure which could contribute to the high strength of cement.

• Periodical: Materials Science Forum (Volume 898)
• Pages: 1990-1995
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.898.1990
• Online since: June 2017
• Authors: Ming Zhang Lan*, Bin Feng Xiang, Jian Feng Wang, Xu Dong Zhao, Xiao Ying Wang
• Keywords: Belite Sulfoaluminate Cement, Early Hydration, Ettringite, Microstructure

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