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Title: Characterisation of the surface thermodynamic properties of cement components by inverse gas chromatography at infinite dilution

Abstract

The surface thermodynamic properties of three main inorganic compounds formed during hydration of Portland cement: calcium hydroxide (Ca(OH){sub 2}), ettringite (3CaO.Al{sub 2}O{sub 3}.3CaSO{sub 4}.32H{sub 2}O) and calcium-silicate-hydrates (C-S-H), respectively, and one mineral filler: calcium carbonate (CaCO{sub 3}), have been characterised by inverse gas chromatography at infinite dilution (IGC-ID) at 35 deg. C. The thermodynamic properties have been investigated using a wide range of non-polar (n-alkane series), Lewis acidic (CH{sub 2}Cl{sub 2} and CHCl{sub 3}), Lewis basic (diethyl ether) and aromatic (benzene) and n-alkene series molecular probes, respectively. The tested samples are fairly high surface energy materials as judged by the high dispersive contribution to the total surface energy (the dispersive components {gamma} {sub s} {sup d} range from 45.6 up to 236.2 mJ m{sup -2} at 35 deg. C) and exhibit amphoteric properties, with a predominant acidic character. In the case of hydrated components (i.e. ettringite and C-S-H), the surface thermodynamic properties have been determined at various temperatures (from 35 up to 120 deg. C) in order to examine the influence of the water content. The changes of both dispersive and specific components clearly demonstrate that the material surface properties are activated with temperature. The changes in the acid-base propertiesmore » are correlated with the extent of the overall water loss induced by the thermal treatment as demonstrated by thermogravimetric analysis (TGA). The elemental surface composition of these compounds has been determined by X-ray photoelectron spectroscopy (XPS)« less

Authors:
 [1];  [1];  [1];  [2]
  1. Interfaces, Traitements, Organisation et Dynamique des Systemes (ITODYS) Universite Paris 7- Denis. Diderot, 1 Rue Guy de la Brosse, 75005 Paris (France)
  2. Laboratoire Central des Ponts et Chaussees (LCPC), 58 Boulevard Lefevre, 75732 Paris Cedex 15 (France). E-mail: benzarti@lcpc.fr
Publication Date:
OSTI Identifier:
20793271
Resource Type:
Journal Article
Resource Relation:
Journal Name: Cement and Concrete Research; Journal Volume: 36; Journal Issue: 2; Other Information: DOI: 10.1016/j.cemconres.2005.02.005; PII: S0008-8846(05)00080-3; Copyright (c) 2005 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; CALCIUM CARBONATES; CALCIUM HYDROXIDES; CALCIUM SILICATES; GAS CHROMATOGRAPHY; HYDRATES; HYDRATION; PORTLAND CEMENT; SURFACE ENERGY; THERMAL GRAVIMETRIC ANALYSIS; X-RAY PHOTOELECTRON SPECTROSCOPY

Citation Formats

Perruchot, Christian, Chehimi, Mohamed M., Vaulay, Marie-Josephe, and Benzarti, Karim. Characterisation of the surface thermodynamic properties of cement components by inverse gas chromatography at infinite dilution. United States: N. p., 2006. Web. doi:10.1016/J.CEMCONRES.2005.0.
Perruchot, Christian, Chehimi, Mohamed M., Vaulay, Marie-Josephe, & Benzarti, Karim. Characterisation of the surface thermodynamic properties of cement components by inverse gas chromatography at infinite dilution. United States. doi:10.1016/J.CEMCONRES.2005.0.
Perruchot, Christian, Chehimi, Mohamed M., Vaulay, Marie-Josephe, and Benzarti, Karim. Wed . "Characterisation of the surface thermodynamic properties of cement components by inverse gas chromatography at infinite dilution". United States. doi:10.1016/J.CEMCONRES.2005.0.
@article{osti_20793271,
title = {Characterisation of the surface thermodynamic properties of cement components by inverse gas chromatography at infinite dilution},
author = {Perruchot, Christian and Chehimi, Mohamed M. and Vaulay, Marie-Josephe and Benzarti, Karim},
abstractNote = {The surface thermodynamic properties of three main inorganic compounds formed during hydration of Portland cement: calcium hydroxide (Ca(OH){sub 2}), ettringite (3CaO.Al{sub 2}O{sub 3}.3CaSO{sub 4}.32H{sub 2}O) and calcium-silicate-hydrates (C-S-H), respectively, and one mineral filler: calcium carbonate (CaCO{sub 3}), have been characterised by inverse gas chromatography at infinite dilution (IGC-ID) at 35 deg. C. The thermodynamic properties have been investigated using a wide range of non-polar (n-alkane series), Lewis acidic (CH{sub 2}Cl{sub 2} and CHCl{sub 3}), Lewis basic (diethyl ether) and aromatic (benzene) and n-alkene series molecular probes, respectively. The tested samples are fairly high surface energy materials as judged by the high dispersive contribution to the total surface energy (the dispersive components {gamma} {sub s} {sup d} range from 45.6 up to 236.2 mJ m{sup -2} at 35 deg. C) and exhibit amphoteric properties, with a predominant acidic character. In the case of hydrated components (i.e. ettringite and C-S-H), the surface thermodynamic properties have been determined at various temperatures (from 35 up to 120 deg. C) in order to examine the influence of the water content. The changes of both dispersive and specific components clearly demonstrate that the material surface properties are activated with temperature. The changes in the acid-base properties are correlated with the extent of the overall water loss induced by the thermal treatment as demonstrated by thermogravimetric analysis (TGA). The elemental surface composition of these compounds has been determined by X-ray photoelectron spectroscopy (XPS)},
doi = {10.1016/J.CEMCONRES.2005.0},
journal = {Cement and Concrete Research},
number = 2,
volume = 36,
place = {United States},
year = {Wed Feb 15 00:00:00 EST 2006},
month = {Wed Feb 15 00:00:00 EST 2006}
}