Performance of magnesia-modified sodium carbonate-activated slag/fly ash concrete

Abdalqadera, A., Jin, F. and Al-Tabbaa, A. (2019) Performance of magnesia-modified sodium carbonate-activated slag/fly ash concrete. Cement and Concrete Composites, 103, pp. 160-174. (doi: 10.1016/j.cemconcomp.2019.05.007)

186181.pdf - Accepted Version



Various innovative research in the cement industry is looking into improving its environmental sustainability. Sodium carbonate-activated slag/fly ash (NC-SF) binders has recently evolved as a potentially more sustainable binding materials than both Portland cement and conventional alkali activated materials such as sodium silicate and sodium hydroxide activated materials. The reaction mechanism and some microstructural properties of NC-SF cements have been a major area of research recently. However, very few studies have scaled up the investigation of these binders into concrete specimens. This paper, therefore, provides new insight into the strength development and the durability performance of NC-SF concrete and MgO-modified NC-SF concrete. Concrete testing included measurements of compressive strength, split tensile strength, water absorption, depth of carbonation, sulphate exposure, acid exposure and elevated-temperature exposure. Microstructure studies were conducted using Powder X-Ray diffraction (PXRD), Thermogravimetric analysis (TGA) and Attenuated Total Reflectance Fourier Transform Infrared spectroscopy (ATR-FTIR). It is concluded that NC-SF concrete mixes develop acceptable mechanical strength and demonstrate high resistance to sulphate attack. They also showed higher resistance to acid attack than the control mix based on sodium silicate-activated slag concrete. Here, emphasis is placed on the potential of developing NC-SF concrete with excellent performance and less complicated production methods as well as a low carbon footprint. It is also found that the use of reactive MgO enhanced the strength development of NC-SF concrete as well as its resistance to acid and carbonation.

Item Type:Articles
Additional Information:The authors would like to thank the Yousef Jameel Foundation and the Cambridge Commonwealth, European and International Trust for their financial support of this research.
Glasgow Author(s) Enlighten ID:Jin, Dr Fei
Authors: Abdalqadera, A., Jin, F., and Al-Tabbaa, A.
College/School:College of Science and Engineering > School of Engineering > Infrastructure and Environment
Journal Name:Cement and Concrete Composites
ISSN (Online):1873-393X
Published Online:09 May 2019
Copyright Holders:Copyright © 2019 Elsevier
First Published:First published in Cement and Concrete Composites 103:160-174
Publisher Policy:Reproduced in accordance with the copyright policy of the publisher

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