Contribution of limestone to the hydration of calcium sulfoaluminate cement
作者： Lukas H.J. Martin , Frank Winnefeld , Christian J. Müller , Barbara Lothenbach
DOI: 10.1016/J.CEMCONCOMP.2015.07.005
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摘要: Abstract Calcium sulfoaluminate (CSA) cements can be blended with mineral additions such as limestone for properties and cost optimization. This study investigates the contribution of to hydration a commercial CSA clinker regarding kinetics, hydrate assemblage compressive strength. Nine formulations were defined at M-values 0, 1.1 2.1 (M = molar ratio anhydrite ye’elimite) without medium high contents. Calorimetric results indicate that accelerates reaction especially M = 1.1, probably due filler effect. The phase assemblages calculated by thermodynamic modeling using Gibbs Energy Minimization Software (GEMS). With increasing content formation ettringite calcium monocarboaluminate is predicted expense monosulfoaluminate. M-value more monocarbonate less calcite takes part in reactions. modeled compare well experimental data after 90 d hydration, except hemicarboaluminate was found instead monocarbonate, which assumed kinetics considerations. lowest strength occurs ternary formulations, whereas absence sulfate, significantly higher. presented here cements, early reactions M
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