Rodriguez, ET, Garbev, K, Merz, D et al. (2 more authors) (2017) Thermal stability of C-S-H phases and applicability of Richardson and Groves’ and Richardson C-(A)-S-H(I) models to synthetic C-S-H. Cement and Concrete Research, 93. pp. 45-56. ISSN 0008-8846
Abstract
Synthetic C-S-H samples prepared with bulk C/S ratios from 0.75 to 1.5 were analyzed by coupled TG/DSC/FTIR and in-situ XRD while heating, in order to correlate observed weight loss curves with the kinetics of evolved gases, and to investigate the transformations C-S-H→β-wollastonite→α-wollastonite. The temperature of the transformation to β-wollastonite increased with increasing C/S. The temperature for the transformation from β- to α-wollastonite meanwhile decreased with increasing C/S; indicating that excess CaO stabilized the α-polymorph. The transformation C-S-H→β-wollastonite was accompanied by the formation of α`LC2S for C/S > 1. In the case of C-S-H with C/S = 1.5, both β-C2S and rankinite were formed and then decomposed before the transformation to β-wollastonite and α`LC2S. C-S-H with low C/S was found to be more stable upon heating. The chemical structural models of Richardson and Groves’ and Richardson C-A-S-H(I) were used to obtain the structural-chemical formulae.
Metadata
Item Type: | Article |
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Authors/Creators: |
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Copyright, Publisher and Additional Information: | © 2016 Published by Elsevier Ltd. This is an author produced version of a paper published in Cement and Concrete Research. Uploaded in accordance with the publisher's self-archiving policy. |
Keywords: | Calorimetry; Calcium Silicate Hydrate (C-S-H); Spectroscopy; Thermal Analysis; X-ray diffraction |
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) |
Funding Information: | Funder Grant number EU - European Union 264448 EU - European Union 264448 EU - European Union 264448 EU - European Union 264448 EU - European Union 264448 |
Depositing User: | Symplectic Publications |
Date Deposited: | 03 Jan 2017 11:56 |
Last Modified: | 15 Jan 2018 01:38 |
Published Version: | https://doi.org/10.1016/j.cemconres.2016.12.005 |
Status: | Published |
Publisher: | Elsevier |
Identification Number: | 10.1016/j.cemconres.2016.12.005 |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:109873 |