Model synthetic pastes for low pH cements - CEA - Commissariat à l’énergie atomique et aux énergies alternatives Access content directly
Journal Articles Cement and Concrete Research Year : 2020

Model synthetic pastes for low pH cements

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 (C$_3$S) and nanosilica, covering calcium-to-silica ratios (C/S) from 0.8 to 3.0. The pure C$_3$S 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.
Fichier principal
Vignette du fichier
Draft Pâtes Modèles_v17.pdf (1.66 Mo) Télécharger le fichier
Origin : Files produced by the author(s)

Dates and versions

cea-02894517 , version 1 (25-07-2022)

Licence

Attribution - NonCommercial - NoDerivatives

Identifiers

Cite

E. Kangni-Foli, Stéphane Poyet, P. Le Bescop, T. Charpentier, F. Bernachy-Barbe, et al.. Model synthetic pastes for low pH cements. Cement and Concrete Research, 2020, 136, pp.106168. ⟨10.1016/j.cemconres.2020.106168⟩. ⟨cea-02894517⟩
179 View
127 Download

Altmetric

Share

Gmail Facebook X LinkedIn More