Abstract
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 SiO2 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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References
Merkel B J, Laner-Friedrich B P. Hydrogeochemical Simulation Program[M]. Wuhan: China University of Geosciences Press, 2005
Merkel B J. Migration Simulation in the Reaction of the Uranium in Groundwater[J]. J. China University of Geosciences, 2000, 5: 451–455
Song Y, Hahn H H, Hoffmann E. Effects of Solution Conditions on the Precipitation of Phosphate for Recovery-a Thermodynamic Evaluation[J]. Chemosphere, 2002, 10: 1 029–1 034
Ma Y. Geochemical Model PHREEQC in the Application of Mantle[J]. Uranium Mining and Metallurgy Process, 2007, 2: 67–71
Hegeson H C. Evaluation of the Irreversible Reactions in Geochemical Processes Involving Minerals in Aqueous Solutions[J]. Geochim. Cosmochim. Acta, 1968, 3: 853–877
Richardson I G, Groves G W. Models for the Composition and Structure of Calcium Silicate Hydrate (C-S-H) Gel in Hardened Rricalcium Silicate Pastes[J]. Cem. Concr. Res., 1992, 22: 1 001–1 010
Richardson I G. The Nature of C-S-H in Hardened Cements[J]. Cem. Concr. Res., 1999, 8: 1 131–1 147
Taylor H F W. Nanostructure of C-S-H: Current Status[J]. Adv. Cem. Based Mater., 1993, 1: 38–46
Parkhurst D L, Thorstenson D C, Plummer L N. PHREEQE-A Computer Program for Geochemical Calculations[M]. Denver: U.S. Geological Survey, 1980
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Funded by the Fundamental Research Funds for the Central Universities (No.CUGL150807), China University of Geosciences(Wuhan) and Public Service Project of the Chinese Ministry of Land and Resources(No.201311024)
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Duan, P., Yan, C., Zhou, W. et al. Thermodynamic calculation and stability of calcium silicate hydrate system. J. Wuhan Univ. Technol.-Mat. Sci. Edit. 30, 147–151 (2015). https://doi.org/10.1007/s11595-015-1116-7
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DOI: https://doi.org/10.1007/s11595-015-1116-7