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Title: Non-ideal solid solution aqueous solution modeling of synthetic calcium silicate hydrate

Abstract

New data relevant to calcium silicate hydrate (C-S-H) gels prepared at room temperature have been obtained over a time period of up to 112 weeks. X-ray diffraction (XRD) indicates equilibrium was attained after 64 weeks. Coupled with fourier transform infrared (FT-IR) spectroscopy, a phase change in C-S-H gel at Ca/Si {approx} 1.0 was identified and the occurrence of portlandite as a distinct phase for Ca/Si > 1.64. The incongruent dissolution of C-S-H gel was modeled as a non-ideal solid solution aqueous solution (SSAS) between the end-member components CaH{sub 2}SiO{sub 4} (CSH) and Ca(OH){sub 2} (CH) using equations defining the solidus and solutus curves on a Lippmann phase diagram. Despite being semi-empirical, the model provides a reasonable and consistent fit to the solubility data and can therefore be used to describe the incongruent dissolution of C-S-H gels with compositions Ca/Si {>=} 1.0.

Authors:
 [1];  [2];  [3];  [4]
  1. Department of Earth Sciences, University of Bristol, Wills Memorial Building, Queen's Road, Bristol, BS8 1RJ (United Kingdom). E-mail: c.walker@nhm.ac.uk
  2. Quintessa Limited, Dalton House, Newtown Road, Henley-on-Thames, RG9 1HG (United Kingdom)
  3. Department of Materials, Imperial College, South Kensington, London, SW7 2AZ (United Kingdom)
  4. Department of Earth Sciences, University of Bristol, Wills Memorial Building, Queen's Road, Bristol, BS8 1RJ (United Kingdom)
Publication Date:
OSTI Identifier:
20995375
Resource Type:
Journal Article
Resource Relation:
Journal Name: Cement and Concrete Research; Journal Volume: 37; Journal Issue: 4; Other Information: DOI: 10.1016/j.cemconres.2006.12.002; PII: S0008-8846(06)00314-0; Copyright (c) 2006 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; AQUEOUS SOLUTIONS; CALCIUM HYDROXIDES; CALCIUM SILICATES; DISSOLUTION; EQUILIBRIUM; FOURIER TRANSFORMATION; GELS; HYDRATES; INFRARED SPECTRA; PHASE DIAGRAMS; SIMULATION; SOLID SOLUTIONS; SOLUBILITY; TEMPERATURE RANGE 0273-0400 K; X-RAY DIFFRACTION

Citation Formats

Walker, Colin S., Savage, David, Tyrer, Mark, and Ragnarsdottir, K. Vala. Non-ideal solid solution aqueous solution modeling of synthetic calcium silicate hydrate. United States: N. p., 2007. Web. doi:10.1016/j.cemconres.2006.12.002.
Walker, Colin S., Savage, David, Tyrer, Mark, & Ragnarsdottir, K. Vala. Non-ideal solid solution aqueous solution modeling of synthetic calcium silicate hydrate. United States. doi:10.1016/j.cemconres.2006.12.002.
Walker, Colin S., Savage, David, Tyrer, Mark, and Ragnarsdottir, K. Vala. Sun . "Non-ideal solid solution aqueous solution modeling of synthetic calcium silicate hydrate". United States. doi:10.1016/j.cemconres.2006.12.002.
@article{osti_20995375,
title = {Non-ideal solid solution aqueous solution modeling of synthetic calcium silicate hydrate},
author = {Walker, Colin S. and Savage, David and Tyrer, Mark and Ragnarsdottir, K. Vala},
abstractNote = {New data relevant to calcium silicate hydrate (C-S-H) gels prepared at room temperature have been obtained over a time period of up to 112 weeks. X-ray diffraction (XRD) indicates equilibrium was attained after 64 weeks. Coupled with fourier transform infrared (FT-IR) spectroscopy, a phase change in C-S-H gel at Ca/Si {approx} 1.0 was identified and the occurrence of portlandite as a distinct phase for Ca/Si > 1.64. The incongruent dissolution of C-S-H gel was modeled as a non-ideal solid solution aqueous solution (SSAS) between the end-member components CaH{sub 2}SiO{sub 4} (CSH) and Ca(OH){sub 2} (CH) using equations defining the solidus and solutus curves on a Lippmann phase diagram. Despite being semi-empirical, the model provides a reasonable and consistent fit to the solubility data and can therefore be used to describe the incongruent dissolution of C-S-H gels with compositions Ca/Si {>=} 1.0.},
doi = {10.1016/j.cemconres.2006.12.002},
journal = {Cement and Concrete Research},
number = 4,
volume = 37,
place = {United States},
year = {Sun Apr 15 00:00:00 EDT 2007},
month = {Sun Apr 15 00:00:00 EDT 2007}
}