Li, Q, Yong, Y, Yang, K orcid.org/0000-0002-4223-2710 et al. (6 more authors) (2019) The role of calcium stearate on regulating activation to form stable, uniform and flawless reaction products in alkali-activated slag cement. Cement and Concrete Composites, 103 (29). pp. 242-251. ISSN 0958-9465
Abstract
In the course of an investigation on using calcium stearate (CaSt) to improve performance of the alkali-activated slag (AAS) cement, the objective of the present work is to discovery its role in the AAS system. Special interest is devoted to understand the influence of CaSt on the reaction process, reaction products and microstructural features of the AAS cement. To achieve this, isothermal calorimetry, impedance characteristics, infrared spectroscopy, X-ray diffraction, thermogravimetry, nitrogen sorption, mercury intrusion porosimetry and scanning electron microscopy were carried out. According to results obtained, the CaSt has three important effects on the AAS cement. Firstly, it inhibited slag reaction with the activator through decreasing activity of alkalis, whereas the amount of C-(A)-S-H gels in the system depended on the usage of CaSt, because the CaSt could have chemical reactions with the alkali-solution and form similar reaction products. Secondly, there is less sodium and more calcium in reaction products of the CaSt added mix, which improve their stability and uniformity. Finally, microstructure characteristics (e.g. pore size distribution, pore connectivity) are optimised and defects are reduced significantly, when CaSt is added in the AAS mix.
Metadata
Item Type: | Article |
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Authors/Creators: |
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Copyright, Publisher and Additional Information: | Crown Copyright © 2019 Published by Elsevier Ltd. This is an author produced version of a paper published in Cement and Concrete Composites. Uploaded in accordance with the publisher's self-archiving policy. |
Keywords: | Alkali-activated slag cement; Activation kinetic; Calcium stearate; Reaction products; Microstructure |
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: | 16 May 2019 11:26 |
Last Modified: | 10 May 2020 00:38 |
Status: | Published |
Publisher: | Elsevier Ltd |
Identification Number: | 10.1016/j.cemconcomp.2019.05.009 |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:146110 |