Hydration of C3S, C2S and their Blends. Micro- and Nanoscale Characterization

Puertas, Francisca and Goñi Elizalde, Sara and Hernandez, Maria Soledad and Guerrero Bustos, Ana and Varga, C. and Palacios, Marta and Dolado, Jorge S. and Zhu, W. and Howind, T. (2011). Hydration of C3S, C2S and their Blends. Micro- and Nanoscale Characterization. In: "13th International Congress on the Chemistry of Cement", 03/07/2011 - 08/07/2011, Madrid, España. p. 282.

Description

Title: Hydration of C3S, C2S and their Blends. Micro- and Nanoscale Characterization
Author/s:
  • Puertas, Francisca
  • Goñi Elizalde, Sara
  • Hernandez, Maria Soledad
  • Guerrero Bustos, Ana
  • Varga, C.
  • Palacios, Marta
  • Dolado, Jorge S.
  • Zhu, W.
  • Howind, T.
Item Type: Presentation at Congress or Conference (Article)
Event Title: 13th International Congress on the Chemistry of Cement
Event Dates: 03/07/2011 - 08/07/2011
Event Location: Madrid, España
Title of Book: Proceedings of 13th International Congress on the Chemistry of Cement
Date: 2011
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 study forms part of wider research conducted under a EU 7 th Framework Programme (COmputationally Driven design of Innovative CEment-based materials or CODICE). The ultimate aim is the multi-scale modelling of the variations in mechanical performance in degraded and non-degraded cementitious matrices. The model is being experimentally validated by hydrating the main tri-calcium silicate (T1-C3S) and bi-calcium silicate (β-C2S), phases present in Portland cement and their blends. The present paper discusses micro- and nanoscale studies of the cementitious skeletons forming during the hydration of C3S, C2S and 70 % / 30 % blends of both C3S/C2S and C2S/C3S with a water/cement ratio of 0.4. The hydrated pastes were characterized at different curing ages with 29 Si NMR, SEM/TEM/EDS, BET, and nanoindentation. The findings served as a basis for the micro- and nanoscale characterization of the hydration products formed, especially C-S-H gels. Differences were identified in composition, structure and mechanical behaviour (nanoindentation), depending on whether the gels formed in C3S or C2S pastes. The C3S gels had more compact morphologies, smaller BET-N2 specific surface area and lesser porosity than the gels from C2S-rich pastes. The results of nanoindentation tests appear to indicate that the various C-S-H phases formed in hydrated C3S and C2S have the same mechanical properties as those formed in Portland cement paste. Compared to the C3S sample, the hydrated C2S specimen was dominated by the loose-packed (LP) and the low-density (LD) C-S-H phases, and had a much lower content of the high density (HD) C-S-H phase

More information

Item ID: 12562
DC Identifier: http://oa.upm.es/12562/
OAI Identifier: oai:oa.upm.es:12562
Deposited by: Memoria Investigacion
Deposited on: 07 Aug 2012 08:03
Last Modified: 21 Apr 2016 11:50
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