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Influence of slag content on mechanical, durability and microstructural performance and their correlations in fly ash geopolymers exposed to marine environment

Influence of slag content on mechanical, durability and microstructural performance and their... This paper attempts to examine the influence of slag content on the fly ash geopolymer concrete exposed to the marine environment and to analyse their interrelationship between the mechanical and durability properties towards the microstructural parameters. The dosage of the slag content is varied with a 10% increment up to 40% based on the literature and preliminary trial mixes. Sodium-based alkaline activator with hydroxide to silicate ratio of 2 is considered and the molarity is fixed as 8M. Several experimental tests to access the mechanical, durability and microstructural parameters are performed. 28-day ambient cured specimens were subjected to a marine environment for various exposure durations and their corresponding mechanical and durability results are obtained which are then interrelated upon microstructural parameters. Irrespective of the dosage of slag, all the specimens show 40–50% deterioration in mechanical properties after 150 days of exposure to the marine environment. 30% dosage of slag which showed higher mechanical performance in unexposed conditions showed a high rate of deterioration after marine exposure, around 50% in mechanical and durability properties, whereas 40% slag mix which showed lesser efficiency before exposure, showed good resistance to strength loss and external agent ingress. SEM images revealed that the weathering action of NaCl salts deteriorates the surface and the size of pores and flaws largely influence the mechanical and durability performances of the exposed specimens. EDAX test confirms the unexpected chemical reactions with respect to intensity and reactions between specimens and marine exposure. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Asian Journal of Civil Engineering Springer Journals

Influence of slag content on mechanical, durability and microstructural performance and their correlations in fly ash geopolymers exposed to marine environment

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References (37)

Publisher
Springer Journals
Copyright
Copyright © The Author(s), under exclusive licence to Springer Nature Switzerland AG 2023. Springer Nature or its licensor (e.g. a society or other partner) holds exclusive rights to this article under a publishing agreement with the author(s) or other rightsholder(s); author self-archiving of the accepted manuscript version of this article is solely governed by the terms of such publishing agreement and applicable law.
ISSN
1563-0854
eISSN
2522-011X
DOI
10.1007/s42107-023-00896-8
Publisher site
See Article on Publisher Site

Abstract

This paper attempts to examine the influence of slag content on the fly ash geopolymer concrete exposed to the marine environment and to analyse their interrelationship between the mechanical and durability properties towards the microstructural parameters. The dosage of the slag content is varied with a 10% increment up to 40% based on the literature and preliminary trial mixes. Sodium-based alkaline activator with hydroxide to silicate ratio of 2 is considered and the molarity is fixed as 8M. Several experimental tests to access the mechanical, durability and microstructural parameters are performed. 28-day ambient cured specimens were subjected to a marine environment for various exposure durations and their corresponding mechanical and durability results are obtained which are then interrelated upon microstructural parameters. Irrespective of the dosage of slag, all the specimens show 40–50% deterioration in mechanical properties after 150 days of exposure to the marine environment. 30% dosage of slag which showed higher mechanical performance in unexposed conditions showed a high rate of deterioration after marine exposure, around 50% in mechanical and durability properties, whereas 40% slag mix which showed lesser efficiency before exposure, showed good resistance to strength loss and external agent ingress. SEM images revealed that the weathering action of NaCl salts deteriorates the surface and the size of pores and flaws largely influence the mechanical and durability performances of the exposed specimens. EDAX test confirms the unexpected chemical reactions with respect to intensity and reactions between specimens and marine exposure.

Journal

Asian Journal of Civil EngineeringSpringer Journals

Published: Feb 1, 2024

Keywords: Fly ash; Geopolymer concrete; GGBS; Marine exposure; Microstructural studies

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