Investigation of the CaO-Al2O3-SiO2-CaSO4-CaCO3-H2O system at 25 degrees C by thermodynamic calculation

D  Damidot; S J  Barnett; F P  Glasser; D E  Macphee

doi:10.1680/adcr.2004.16.2.69

Investigation of the CaO-Al2O3-SiO2-CaSO4-CaCO3-H2O system at 25 degrees C by thermodynamic calculation

D Damidot, S J Barnett, F P Glasser, D E Macphee

Chemistry

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35 Citations (Scopus)

Abstract

The phase diagram of the CaO-Al2O3-SiO2-CaSO4-CaCO3-H2O system relevant to cement has been calculated at 25degreesC and 1 bar pressure. It is composed of 331 stable phase assemblages in equilibrium with the aqueous phase and contains 30 invariant points with 15 solids. Thaumasite appears to be a stable phase with a wide stability domain. Compared to ettringite, thaumasite is stable to lower pH and generally demands higher sulphate concentrations to be stable.

Original language	English
Pages (from-to)	69-76
Number of pages	8
Journal	Advances in Cement Research
Volume	16
Issue number	2
DOIs	https://doi.org/10.1680/adcr.2004.16.2.69
Publication status	Published - Apr 2004

Keywords

thaumasite
NA2O
cement

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10.1680/adcr.2004.16.2.69Licence: Unspecified

International Standards for Portland-Limestone Cements
Fredrik Paul Glasser (Coordinator) & Donald MacPhee (Coordinator)
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abstract = "The phase diagram of the CaO-Al2O3-SiO2-CaSO4-CaCO3-H2O system relevant to cement has been calculated at 25degreesC and 1 bar pressure. It is composed of 331 stable phase assemblages in equilibrium with the aqueous phase and contains 30 invariant points with 15 solids. Thaumasite appears to be a stable phase with a wide stability domain. Compared to ettringite, thaumasite is stable to lower pH and generally demands higher sulphate concentrations to be stable.",

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author = "D Damidot and Barnett, {S J} and Glasser, {F P} and Macphee, {D E}",

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AU - Damidot, D

AU - Barnett, S J

AU - Glasser, F P

AU - Macphee, D E

PY - 2004/4

Y1 - 2004/4

N2 - The phase diagram of the CaO-Al2O3-SiO2-CaSO4-CaCO3-H2O system relevant to cement has been calculated at 25degreesC and 1 bar pressure. It is composed of 331 stable phase assemblages in equilibrium with the aqueous phase and contains 30 invariant points with 15 solids. Thaumasite appears to be a stable phase with a wide stability domain. Compared to ettringite, thaumasite is stable to lower pH and generally demands higher sulphate concentrations to be stable.

AB - The phase diagram of the CaO-Al2O3-SiO2-CaSO4-CaCO3-H2O system relevant to cement has been calculated at 25degreesC and 1 bar pressure. It is composed of 331 stable phase assemblages in equilibrium with the aqueous phase and contains 30 invariant points with 15 solids. Thaumasite appears to be a stable phase with a wide stability domain. Compared to ettringite, thaumasite is stable to lower pH and generally demands higher sulphate concentrations to be stable.

KW - thaumasite

KW - NA2O

KW - cement

U2 - 10.1680/adcr.2004.16.2.69

DO - 10.1680/adcr.2004.16.2.69

M3 - Article

SN - 0951-7197

VL - 16

SP - 69

EP - 76

JO - Advances in Cement Research

JF - Advances in Cement Research

IS - 2

ER -

Investigation of the CaO-Al2O3-SiO2-CaSO4-CaCO3-H2O system at 25 degrees C by thermodynamic calculation

Abstract

Keywords

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International Standards for Portland-Limestone Cements

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