Model synthetic pastes for low pH cements: Fid-Bau Portal

Model synthetic pastes for low pH cements

Kangni-Foli, E. / Poyet, S. / Le Bescop, P. / Charpentier, T. / Bernachy-Barbé, F. / Dauzères, A. / L'Hôpital, E. / Neji, M. / d'Espinose de Lacaillerie, J.-B.

Abstract

Abstract Model synthetic pastes were designed to obtain a simplified silica system that could be used in durability studies on materials with low calcium-to-silica ratios. The synthetic pastes made use of the well-known pozzolanic reaction between tricalcium silicate (C3S) and nanosilica, covering calcium-to-silica ratios (C/S) from 0.8 to 3.0. The pure C3S paste (C/S = 3.0) contained C-S-H and portlandite, while pastes with C/S < 1.4 only included C-S-H. The pore solution pH directly correlated with the C/S ratio. The synthetic pastes demonstrated a mineralogy, a C-S-H structure, a mean chain length and pore network features that were similar to ordinary Portland cement (OPC) and low-pH materials, depending on their C/S ratios. The main shortcomings were: (1) high water-to-binder ratio and high superplasticizer dosage to maintain the workability of the synthetic pastes of low C/S ratios and (2) significant cracking of the pastes of low C/S ratios.

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Model synthetic pastes for low pH cements

Kangni-Foli, E. / Poyet, S. / Le Bescop, P. / Charpentier, T. / Bernachy-Barbé, F. / Dauzères, A. / L'Hôpital, E. / Neji, M. / d'Espinose de Lacaillerie, J.-B.

Abstract

Model synthetic pastes for low pH cements

Kangni-Foli, E. / Poyet, S. / Le Bescop, P. / Charpentier, T. / Bernachy-Barbé, F. / Dauzères, A. / L'Hôpital, E. / Neji, M. / d'Espinose de Lacaillerie, J.-B.