Potential pozzolanicity of Algerian calcined bentonite used as cement replacement: optimisation of calcination temperature and effect on strength of self-compacting mortars

El-Abidine Laidani, Zine and Benabed, Benchaa and Abousnina, Rajab and Gueddouda, M. Kamal and Khatib, M. Jamal (2020) Potential pozzolanicity of Algerian calcined bentonite used as cement replacement: optimisation of calcination temperature and effect on strength of self-compacting mortars. European Journal of Environmental and Civil Engineering (1964-8189). 2116 -7214. ISSN 1964-8189


Abstract

The effect of using calcined bentonite (CB) as a partial replacement for Ordinary Portland cement (OPC) in self-compacting mortar (SCM) is investigated. The pozzolanicity of this calcined clay is evaluated using the strength activity index and TG/ATD analysis. The cement in SCM has been replaced with CB at 0, 5, 10, 15, 20, 25 and 30% by mass of cement. The effect of CB on fresh SCM properties is examined using mini-slump flow and V-funnel flow time. The compressive strength is determined at the age of 3, 7 and 28days, and the ultrasonic pulse velocity (UPV), hardened density and water absorption are determined at the age of 28days. The behaviour of SCM exposed to high temperature is also studied. The results indicate that CB significantly decreased the flowability of SCM, but these results are good enough for SCM and SCC production. Incorporating 10 and 15% of CB improves the compressive strength and UPV. Water absorption tends to increase slightly with an increase in CB content and there is a decrease in density as the amount of CB increases. SCM containing CB is stronger when exposed to high temperature than those exposed to normal temperature (23C).


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Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Additional Information: Files associated with this item cannot be displayed due to copyright restrictions.
Faculty/School / Institute/Centre: Current - Faculty of Health, Engineering and Sciences - School of Civil Engineering and Surveying (1 July 2013 -)
Faculty/School / Institute/Centre: Current - Institute for Advanced Engineering and Space Sciences - Centre for Future Materials (1 Jan 2017 -)
Date Deposited: 16 Jun 2020 02:38
Last Modified: 27 Jul 2020 00:06
Uncontrolled Keywords: Calcined bentonite; fresh properties; pozzolanicity; SCM; strength; water absorption; high temperature
Fields of Research (2008): 09 Engineering > 0905 Civil Engineering > 090503 Construction Materials
Socio-Economic Objectives (2008): D Environment > 96 Environment > 9606 Environmental and Natural Resource Evaluation > 960602 Eco-Verification (excl. Environmental Lifecycle Assessment)
Identification Number or DOI: https://doi.org/10.1080/19648189.2020.1713898
URI: http://eprints.usq.edu.au/id/eprint/37883

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