Dubina, E, Plank, J, Korat, L et al. (2 more authors) (2013) Influence of water vapour and carbon dioxide on free lime during storage at 80 °C, studied by Raman spectroscopy. Spectrochimica Acta - Part A Molecular and Biomolecular Spectroscopy, 111. 299 - 303. ISSN 1386-1425
Abstract
Micro-Raman spectroscopy has been used to follow the reaction of free lime (CaO) exposed for 24 h to moist air at 80 °C under conditions of different relative humidities (10-80% RH). X-ray diffraction and SEM imaging were applied as complementary techniques. The conversion of lime to calcium hydroxide and its subsequent carbonation to various calcium carbonate polymorphs was found to strongly depend on the relative humidity. At low RH (10-20%), only Raman spectroscopy revealed the formation of early amorphous CaCO which in the XRD patterns was detected only at ≥40% RH. However, XRD analysis could identify the crystalline polymorphs formed at higher relative humidities. Thus, between 20 and 60% RH, all three CaCO polymorphs (calcite, aragonite and vaterite) were observed via XRD whereas at high relative humidity (80%), calcite was the predominant reaction product. The results demonstrate the usefulness of Raman spectroscopy in the study of minor cement constituents and their reaction products on air, especially of amorphous character.
Metadata
Item Type: | Article |
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Authors/Creators: |
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Copyright, Publisher and Additional Information: | (c) 2013, Elsevier. NOTICE: this is the author’s version of a work that was accepted for publication in Spectrochimica Acta - Part A Molecular and Biomolecular Spectroscopy. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Spectrochimica Acta - Part A Molecular and Biomolecular Spectroscopy, 111, 2013, 10.1016/j.saa.2013.04.033. |
Keywords: | Calcium carbonate polymorphs; Calcium oxide; Carbonation; Micro-Raman; Moisture; SEM/EDX |
Dates: |
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Institution: | The University of Leeds |
Academic Units: | The University of Leeds > Faculty of Engineering & Physical Sciences (Leeds) > School of Civil Engineering (Leeds) > Institute for Resilient Infrastructure (Leeds) |
Depositing User: | Symplectic Publications |
Date Deposited: | 24 Apr 2014 11:33 |
Last Modified: | 23 Jun 2023 21:39 |
Published Version: | http://dx.doi.org/10.1016/j.saa.2013.04.033 |
Status: | Published |
Publisher: | Elsevier |
Identification Number: | 10.1016/j.saa.2013.04.033 |
Related URLs: | |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:78597 |