Study on Properties and Hydration Process of Solid Waste Based Cementitious Materials Modified by Calcium Sulfoaluminate Cement
REN Caifu1, WANG Dongmin1,*, FANG Kuizhen2, WANG Jixiang1, LI Xiaohui3, ZHANG Xinlong4
1 School of Chemical and Environmental Engineering, China University of Mining and Technology-Beijing, Beijing 100083, China 2 School of Civil Engineering, Tsinghua University, Beijing 100084, China 3 College of Environmental and Safety Engineering, Liaoning University of Petrochemical Technology, Fushun 113005, Liaoning, China 4 China Architecture Northeast Design and Research Institute Co., Ltd., Shenyang 110000, China
Abstract: The solid waste based cementitious materials was mainly prepared from steel slag, slag and desulphurized gypsum, it has a long setting time and insufficient mechanical properties. In view of these problems, proposed a method that using calcium sulfoaluminate cement (CSA) to improve the properties of solid waste based cementitious materials. By means of heat of hydration, XRD, FTIR, TG-DSC, SEM and MIP, the influence mechanism of CSA on the hydration process, hardened paste composition and microstructure evolution of solid waste based cementitious materials was investigated, and the modification mechanism was further revealed. The results show that when the content of CSA is 5% (mass fraction), the 3-day and 28-day compressive strength of the cementitious materials reaches 17.7 MPa and 31.1 MPa, respectively, it increased by 21.2% and 23.4% respectively compared with the blank group. CSA in highly active mineral form AFt C4A3 rapid hydration, significantly shortens the setting time of solid waste based cementitious materials. CSA accelerates the hydration reaction process of the system, greatly advances the hydration induction period and the hydration heat release peak, and increases the total heat release. However, the addition of CSA reduces the initial pH value of the paste and delays the dissociation process of the slag to a certain extent. As the degree of hydration deepens, more AFt, C-S-H gels and other hydration products will be generated in the system, especially the formation of a large number of C-S-H gels in the late stage of the reaction, improving the bound water content and reaction depth of the system. In the system, needle-rod AFt and C-S-H gels interpenetrate and lap with each other, fill the pores, refine the pore size, and form a more dense microstructure, thus greatly improving the mechanical properties of solid waste based cementitious materials.
任才富, 王栋民, 房奎圳, 王吉祥, 李晓慧, 张信龙. 硫铝水泥改性固废基胶凝材料性能与水化进程研究[J]. 材料导报, 2025, 39(18): 24090006-8.
REN Caifu, WANG Dongmin, FANG Kuizhen, WANG Jixiang, LI Xiaohui, ZHANG Xinlong. Study on Properties and Hydration Process of Solid Waste Based Cementitious Materials Modified by Calcium Sulfoaluminate Cement. Materials Reports, 2025, 39(18): 24090006-8.
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2025, Vol. 39 
