Materiales de Construcción, Vol 61, No 302 (2011)

Textural and mechanical characterization of C-S-H gels from hydration of synthetic T1-C3S, β-C2S and their blends


https://doi.org/10.3989/mc.2011.00511

S. Goñi
Instituto de Ciencias de la Construcción Eduardo Torroja (IETcc-CSIC) - Materiales de Construcción Nanoestructurados y Ecoeficientes. Unidad Asociada LABEIN-Tecnalia/CSIC.IETcc, Spain

A. Guerrero
Instituto de Ciencias de la Construcción Eduardo Torroja (IETcc-CSIC) - Materiales de Construcción Nanoestructurados y Ecoeficientes. Unidad Asociada LABEIN-Tecnalia/CSIC.IETcc, Spain

F. Puertas
Instituto de Ciencias de la Construcción Eduardo Torroja (IETcc-CSIC) - Materiales de Construcción Nanoestructurados y Ecoeficientes. Unidad Asociada LABEIN-Tecnalia/CSIC.IETcc, Spain

M. S. Hernández
Instituto de Ciencias de la Construcción Eduardo Torroja (IETcc-CSIC), Spain

M. Palacios
Institute for Building Materials, ETH Zurich, Switzerland

J. S. Dolado
Materiales de Construcción Nanoestructurados y Ecoeficientes. Unidad Asociada LABEIN-Tecnalia/CSIC.IETcc - LABEIN-Tecnalia, Spain

W. Zhu
University of the West of Scotland, United Kingdom

T. Howind
University of the West of Scotland, United Kingdom

Abstract


The textural and mechanical characterization of C-S-H gels formed from the hydration of pure T1-C3S, β-C2S and their blends are studied by Nitrogen sorption and nanoindentation experiments. The surface area and nanoporosity of C-S-H gels formed from the hydration of β-C2S and the 30-70 (T1-C3S and β-C2S mixture) are higher than those from hydration of T1-C3S, and 70-30, with the difference decreasing with hydration age. Such changes are well supported by findings of nanoindentation study, which shows the greater relative volume of C-S-H phases with lower densities in the β-C2S and the 30-70 pastes. With the increase in hydration age, the relative volume of C-S-H phases with higher densities increased at the expenses of those with lower density. Important quantitative correlations were found among these textural characteristics and the mean chain length, determined from 29Si magic-angle-spinning (MAS) NMR, of the C-S-H gels.

Keywords


C3S; C2S; C-S-H gel; textural characterization and nanoindentation

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References


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