Thermodynamic modeling of hydration of calcium sulfoaluminate cements blended with mineral additions
This contribution presents a thermodynamic hydration model for cal cium sulfoaluminate cements based on cement composition and calculations of thermodynamic equilibria applying a geochemical speciation code.The dissolu tion kinetics of anhydrous phases can be determined experimentally, e.g.by X ray diffraction, and implemented in the model.For the calculations the geo chemical code GEMS-PSI coupled with the cement-specific CEMDATA 07.2 da tabase is used.The results of the thermodynamic modeling are compared with experimental data obtained by X-ray diffraction, thermogravimetry, EDX ana lyses and pore solution analyses.Two different examples are considered in this contribution: (i) ternary blends of calcium sulfoaluminate clinker with calcium sulfate and calcium carbonate, and (ii) ternary blends of calcium sulfoaluminate clinker with calcium sulfate and ordinary Portland cement.The results show that the additions of limestone or Portland cement, re spectively, do not only influence hydration kinetics of calcium sulfoaluminate ce ments, but also have a strong impact on the stable hydrate assemblage and the volume of hydrates formed.
Calcium sulfoaluminate cement Portland cement Limestone Ternary binders, Thermodynamic modeling
Winnefeld Frank Lothenbach Barbara
Empa-Swiss Federal Laboratories for Materials Science and Technology ,Concrete / Construction Chemistry Laboratory,Diibendorf,8600,Switzerland
国际会议
武汉
英文
212-228
2013-10-23（万方平台首次上网日期，不代表论文的发表时间）