Preparation and Composition Optimization of Low-CO₂-Emission Cement Containing Belite, Calcium Sulfoaluminate and Ferrite

Abstract:

Cement clinker with low CO₂ emission was prepared in laboratory, which mainly consist of belite (C₂S), calcium sulfoaluminate (C₄A₃S), and ferrite (C₄AF). The mineral composition of clinker was optimized for better compressive strength development. The chemical and physical properties of this prepared cement were characterized through X-ray diffraction (XRD), back scattered electron-scanning electron microscopy (BSE-SEM) and differential thermal analysis (DTA). The results reveal that C₄A₃S governs most of the compressive strength at early ages, while C₂S contributes to the later strength development. C₄AF is in liquid when fired to 1300°C, beneficial to the mass transfer but causing high crystallinity of C₂S when excessive. Finally the results of experiments suggest that the optimal composition of clinker is 50wt. % C₂S, 40wt. % C₄A₃S and 10wt. % C₄AF.

• Periodical: Key Engineering Materials (Volume 727)
• Pages: 1067-1073
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.727.1067
• Online since: January 2017
• Authors: Wu Yao*, Qiao Ling, Meng Xue Wu
• Keywords: Belite, Calcium Sulfoaluminate, Cement, Ferrite

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