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Title: A comparative structural study of wet and dried ettringite

Abstract

Two different techniques were used to compare structural characteristics of 'wet' ettringite (stored in the synthesis mother liquid) and 'dried' ettringite (dried to 35% relative humidity over saturated CaCl{sub 2} solution). Lattice parameters and the water content in the channel region of the structure (site occupancy factor of the water molecule not bonded to cations) as well as microstructure parameters (size and strain) were determined from a Rietveld refinement on synchrotron powder diffraction data. Local environment of sulphate anions and of the hydrogen bonding network was characterized by Raman spectroscopy. Both techniques led to the same conclusion: the 'wet' ettringite sample immersed in the mother solution from the synthesis presents similar structural features as ettringite dried to 35% relative humidity. An increase of the a lattice parameter combined with a decrease of the c lattice parameter occurs on drying. The amount of structural water, the point symmetry of sulphate and the hydrogen bond network are unchanged when passing from the wet to the dried ettringite powder. Ettringite does not form a high-hydrate polymorph in equilibrium with alkaline solution, in contrast to the AFm phases that lose water molecules on drying. According to these results we conclude that ettringite precipitated inmore » aqueous solution at the early hydration stages is of the same chemical composition as ettringite present in the hardening concrete.« less

Authors:
 [1];  [2];  [3];  [3]
  1. Clermont Universite, ENSCCF, Laboratoire des Materiaux Inorganiques, BP 10448, F-63000 Clermont-Ferrand (France)
  2. Swiss-Norwegian Beam Lines at ESRF, 6 rue Jules Horowitz, BP 220, 38043 Grenoble (France)
  3. University of Erlangen, GeoZentrum Nordbayern, Mineralogy, Schlossgarten 5 a, 91054 Erlangen (Germany)
Publication Date:
OSTI Identifier:
21344747
Resource Type:
Journal Article
Journal Name:
Cement and Concrete Research
Additional Journal Information:
Journal Volume: 40; Journal Issue: 3; Other Information: DOI: 10.1016/j.cemconres.2009.11.002; PII: S0008-8846(09)00317-2; Copyright (c) 2009 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Journal ID: ISSN 0008-8846
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; AQUEOUS SOLUTIONS; CALCIUM CHLORIDES; CHEMICAL COMPOSITION; CONCRETES; CRYSTAL STRUCTURE; DRYING; HARDENING; HUMIDITY; HYDRATES; HYDRATION; LATTICE PARAMETERS; LIQUIDS; MICROSTRUCTURE; RAMAN SPECTROSCOPY; STRAINS; SULFATES; SYNTHESIS; WATER; X-RAY DIFFRACTION; ALKALINE EARTH METAL COMPOUNDS; BUILDING MATERIALS; CALCIUM COMPOUNDS; CALCIUM HALIDES; CHLORIDES; CHLORINE COMPOUNDS; COHERENT SCATTERING; DIFFRACTION; DISPERSIONS; FLUIDS; HALIDES; HALOGEN COMPOUNDS; HOMOGENEOUS MIXTURES; HYDROGEN COMPOUNDS; LASER SPECTROSCOPY; MATERIALS; MIXTURES; MOISTURE; OXYGEN COMPOUNDS; SCATTERING; SOLUTIONS; SOLVATION; SPECTROSCOPY; SULFUR COMPOUNDS

Citation Formats

Renaudin, G, CNRS, UMR 6002, LMI, F-63177 Aubiere, Filinchuk, Y, Neubauer, J, and Goetz-Neunhoeffer, F. A comparative structural study of wet and dried ettringite. United States: N. p., 2010. Web. doi:10.1016/j.cemconres.2009.11.002.
Renaudin, G, CNRS, UMR 6002, LMI, F-63177 Aubiere, Filinchuk, Y, Neubauer, J, & Goetz-Neunhoeffer, F. A comparative structural study of wet and dried ettringite. United States. https://doi.org/10.1016/j.cemconres.2009.11.002
Renaudin, G, CNRS, UMR 6002, LMI, F-63177 Aubiere, Filinchuk, Y, Neubauer, J, and Goetz-Neunhoeffer, F. Mon . "A comparative structural study of wet and dried ettringite". United States. https://doi.org/10.1016/j.cemconres.2009.11.002.
@article{osti_21344747,
title = {A comparative structural study of wet and dried ettringite},
author = {Renaudin, G and CNRS, UMR 6002, LMI, F-63177 Aubiere and Filinchuk, Y and Neubauer, J and Goetz-Neunhoeffer, F},
abstractNote = {Two different techniques were used to compare structural characteristics of 'wet' ettringite (stored in the synthesis mother liquid) and 'dried' ettringite (dried to 35% relative humidity over saturated CaCl{sub 2} solution). Lattice parameters and the water content in the channel region of the structure (site occupancy factor of the water molecule not bonded to cations) as well as microstructure parameters (size and strain) were determined from a Rietveld refinement on synchrotron powder diffraction data. Local environment of sulphate anions and of the hydrogen bonding network was characterized by Raman spectroscopy. Both techniques led to the same conclusion: the 'wet' ettringite sample immersed in the mother solution from the synthesis presents similar structural features as ettringite dried to 35% relative humidity. An increase of the a lattice parameter combined with a decrease of the c lattice parameter occurs on drying. The amount of structural water, the point symmetry of sulphate and the hydrogen bond network are unchanged when passing from the wet to the dried ettringite powder. Ettringite does not form a high-hydrate polymorph in equilibrium with alkaline solution, in contrast to the AFm phases that lose water molecules on drying. According to these results we conclude that ettringite precipitated in aqueous solution at the early hydration stages is of the same chemical composition as ettringite present in the hardening concrete.},
doi = {10.1016/j.cemconres.2009.11.002},
url = {https://www.osti.gov/biblio/21344747}, journal = {Cement and Concrete Research},
issn = {0008-8846},
number = 3,
volume = 40,
place = {United States},
year = {2010},
month = {3}
}