Quantitative study of hydration of C3S and C2S by thermal analysis. Evolution and composition of C-S-H gels formed

Goñi Elizalde, Sara and Puertas, Francisca and Hernandez, Maria Soledad and Palacios, Marta and Guerrero Bustos, Ana and Dolado, Jorge S. and Bruno, Zanga and Baroni, Fulvio (2010). Quantitative study of hydration of C3S and C2S by thermal analysis. Evolution and composition of C-S-H gels formed. "Journal of Thermal Analysis and Calorimetry", v. 102 (n. 3); pp. 965-973. ISSN 1388-6150. https://doi.org/10.1007/s10973-010-0816-7.

Description

Title: Quantitative study of hydration of C3S and C2S by thermal analysis. Evolution and composition of C-S-H gels formed
Author/s:
  • Goñi Elizalde, Sara
  • Puertas, Francisca
  • Hernandez, Maria Soledad
  • Palacios, Marta
  • Guerrero Bustos, Ana
  • Dolado, Jorge S.
  • Bruno, Zanga
  • Baroni, Fulvio
Item Type: Article
Título de Revista/Publicación: Journal of Thermal Analysis and Calorimetry
Date: December 2010
ISSN: 1388-6150
Volume: 102
Subjects:
Faculty: E.T.S.I. Caminos, Canales y Puertos (UPM)
Department: Ingeniería Civil: Construcción
Creative Commons Licenses: Recognition - No derivative works - Non commercial

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Abstract

This research is part of a European project (namely, CODICE project), main objective of which is modelling, at a multi-scale, the evolution of the mechanical performance of non-degraded and degraded cementitious matrices. For that, a series of experiments were planned with pure synthetic tri-calcium silicate (C3S) and bi-calcium silicate (C2S) (main components of the Portland cement clinker) to obtain different calcium–silicate–hydrate (C–S–H) gel structures during their hydration. The characterization of those C–S–H gels and matrices will provide experimental parameters for the validation of the multi-scale modelling scheme proposed. In this article, a quantitative method, based on thermal analyses, has been used for the determination of the chemical composition of the C–S–H gel together with the degree of hydration and quantitative evolution of all the components of the pastes. Besides, the microstructure and type of silicate tetrahedron and mean chain length (MCL) were studied by scanning electron microscopy (SEM) and 29Si magic-angle-spinning (MAS) NMR, respectively. The main results showed that the chemical compositions for the C–S–H gels have a CaO/SiO2 M ratio almost constant of 1.7 for both C3S and C2S compounds. Small differences were found in the gel water content: the H2O/SiO2 M ratio ranged from 2.9 ± 0.2 to 2.6 ± 0.2 for the C3S (decrease) and from 2.4 ± 0.2 to 3.2 ± 0.2 for the C2S (increase). The MCL values of the C–S–H gels, determined from 29Si MAS NMR, were 3.5 and 4 silicate tetrahedron, for the hydrated C3S and C2S, respectively, remaining almost constant at all hydration periods.

More information

Item ID: 8237
DC Identifier: http://oa.upm.es/8237/
OAI Identifier: oai:oa.upm.es:8237
DOI: 10.1007/s10973-010-0816-7
Official URL: http://www.springerlink.com/content/t071nql68m765155/
Deposited by: Memoria Investigacion
Deposited on: 31 Aug 2011 11:39
Last Modified: 20 Apr 2016 17:06
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