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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 (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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Submitted on : Wednesday, July 21, 2021 - 8:51:28 AM
Last modification on : Thursday, August 12, 2021 - 2:56:01 PM
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E Kangni-Foli, Stéphane Poyet, P Le Bescop, T Charpentier, F Bernachy-Barbé, et al.. Model synthetic pastes for low pH cements. Cement and Concrete Research, Elsevier, 2020, 136, pp.106168. ⟨10.1016/j.cemconres.2020.106168⟩. ⟨cea-03293414⟩



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