Composition and thermodynamic modeling of calcium sulfoaluminate cement and ordinary Portland cement blends
Calcium sulfoaluminate (CSA) cement and ordinary Portland cement (OPC) blends are innovative hydraulic binders which allow the control of prop erties such as dimensional stability or hardening speed.This article describes the hydration behavior of three different OPCCSA cement blends (85 %-15 %, 70%-30% and 40%-60%).Proportions of hydrates and anhydrous components were determined by thermogravimetric and X-ray diffraction analyses; the Rietveld refinement was utilized for hydrated samples at 2 hours, 1, 3 and 7 days as well as after 1 and 3 months.Dissolution kinetics of cement phases were employed for thermody namic modeling using a geochemical software based on Gibbs free energy mini mization.The predicted hydrate assemblage, depending on the hydration time, was compared to that obtained with the experimental results.Ca, Al, Si, S, K and Na concentrations in pore solutions were used for calculating saturation indices of cement hydrates.The results indicate a good correlation between the hydrates formed and pore solution composition and show the different hydration mechanisms depending on the OPC and CSA ce ment proportion.Thermodynamic modeling gives a better understanding of phase equilibria in the blends.Modeling is also used to predict the composition of unstudied blends and to discuss the impact of the sulfate amount.
Calcium sulfoaluminate cement Ordinary Portland cement Hydration products Thermodynamic modeling Pore solution
Trauchessec Romain Winnefeld Frank Mechling Jean-Michel Lecomte Andé Roux André Le Rolland Bruno
Institut Jean Lamour,UMR 7198,CP2S,Equipe Matériaux pour le Génie Civil,Université de Lorraine,IUT-N Empa,Swiss Federal Laboratories for Materials Testing and Research,Laboratory for Concrete and Const CTG,Italcementi Group,rue des Technodes,78931 Guerville,France
国际会议
武汉
英文
193-211
2013-10-23（万方平台首次上网日期，不代表论文的发表时间）