Thermodynamic Calculation and Stability of Calcium Silicate Hydrate System
来源期刊：Journal Of Wuhan University Of Technology Materials Science Edition2015年第1期
论文作者：段平 严春杰 ZHOU Wei SHUI Zhonghe
文章页码：147 - 151
摘 要：Dissolution of cement clinker minerals involves a number of physical and chemical processes, and the simulation of dissolution processes helps to understand cement hydration conveniently. Dissolution model of cement clinker minerals was set up based on simulation theory of geochemical reaction equilibrium, PHREEQC simulation software provided by United States Geological Survey（USGS） was employed for thermodynamic calculation of C-S-H system. Stability of C-S-H system with low Ca/Si ratio at normal temperature was also explored. The results show that many phase assemblages coexist with the aqueous phase depending on its composition. The most stable product varies with different Ca/Si ratio of C-S-H system. Active Si O2 will consume excessive CH, so the Ca/Si ratios of C-S-H system decrease, C-S-H with low Ca/Si ratio becomes the most stable product, and this is the thermodynamic driving force of secondary pozzolanic reaction.
段平1,2,3，严春杰1,2,3，ZHOU Wei1,2，SHUI Zhonghe4
1. Faculty of Materials Science and Chemistry, China University of Geosciences2. Engineering Research Center of Nano-Geomaterials of Ministry of Education, China University of Geosciences3. Zhejiang Research Institute, China University of Geosciences4. School of Materials Science and Engineering, Wuhan University of Technology
摘 要：Dissolution of cement clinker minerals involves a number of physical and chemical processes, and the simulation of dissolution processes helps to understand cement hydration conveniently. Dissolution model of cement clinker minerals was set up based on simulation theory of geochemical reaction equilibrium, PHREEQC simulation software provided by United States Geological Survey（USGS） was employed for thermodynamic calculation of C-S-H system. Stability of C-S-H system with low Ca/Si ratio at normal temperature was also explored. The results show that many phase assemblages coexist with the aqueous phase depending on its composition. The most stable product varies with different Ca/Si ratio of C-S-H system. Active Si O2 will consume excessive CH, so the Ca/Si ratios of C-S-H system decrease, C-S-H with low Ca/Si ratio becomes the most stable product, and this is the thermodynamic driving force of secondary pozzolanic reaction.
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