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

Colin S. Walker; David Savage; Mark Tyrer; K. Vala Ragnarsdottir

doi:10.1016/j.cemconres.2006.12.002

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

Colin S. Walker, David Savage, Mark Tyrer, K. Vala Ragnarsdottir

Research output: Contribution to journal › Article › peer-review

54 Citations (Scopus)

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 ≈ 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 CaH₂SiO₄ (CSH) and Ca(OH)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.

Original language	English
Pages (from-to)	502-511
Number of pages	10
Journal	Cement and Concrete Research
Volume	37
Issue number	4
Early online date	26 Jan 2007
DOIs	https://doi.org/10.1016/j.cemconres.2006.12.002
Publication status	Published - Apr 2007
Externally published	Yes

Keywords

pH
calcium silicate hydrate (C-S-H)
Ca(OH)
Modeling

ASJC Scopus subject areas

Industrial and Manufacturing Engineering
Ceramics and Composites

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10.1016/j.cemconres.2006.12.002

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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 ≈ 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 CaH2SiO4 (CSH) and Ca(OH)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.",

keywords = "pH, calcium silicate hydrate (C-S-H), Ca(OH), Modeling",

author = "Walker, {Colin S.} and David Savage and Mark Tyrer and Ragnarsdottir, {K. Vala}",

year = "2007",

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language = "English",

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T1 - Non-ideal solid solution aqueous solution modeling of synthetic calcium silicate hydrate

AU - Walker, Colin S.

AU - Savage, David

AU - Tyrer, Mark

AU - Ragnarsdottir, K. Vala

PY - 2007/4

Y1 - 2007/4

N2 - 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 ≈ 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 CaH2SiO4 (CSH) and Ca(OH)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.

AB - 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 ≈ 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 CaH2SiO4 (CSH) and Ca(OH)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.

KW - pH

KW - calcium silicate hydrate (C-S-H)

KW - Ca(OH)

KW - Modeling

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U2 - 10.1016/j.cemconres.2006.12.002

DO - 10.1016/j.cemconres.2006.12.002

M3 - Article

AN - SCOPUS:33947585038

SN - 0008-8846

VL - 37

SP - 502

EP - 511

JO - Cement and Concrete Research

JF - Cement and Concrete Research

IS - 4

ER -

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

Abstract

Keywords

ASJC Scopus subject areas

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