Understanding the effect of recycled concrete aggregate and cementitious materials on concrete's fire resistance
Journal of Structural Fire Engineering
ISSN: 2040-2317
Article publication date: 17 December 2021
Issue publication date: 22 September 2022
Abstract
Purpose
Fire can severely affect concrete structures and with knowledge of the properties of materials, the damage can be assessed. Aggregate, cement matrix and their interaction are the most important components that affect concrete behaviour at high temperatures. The effect of incorporating recycled concrete aggregate or cementitious materials, namely, cement type and pulverized fly ash, are reviewed to provide a better understanding of their involvement in fire resistance.
Design/methodology/approach
More investigation research is needed to understand the fire resistance of such sustainable concrete that was already constructed. The present study illustrates the effect of using recycled concrete aggregate and cementitious materials on the fire resistance of concrete. To do so, a literature review was conducted and relevant data were collected and presented in a simple form. The author's selected research findings, which are related to the presents study, are also presented and discussed.
Findings
Recycled concrete aggregate enhances the concrete behaviour at high temperatures when it substitutes the natural aggregate by reasonable substitution (more than 25–30%). It also almost eliminates the possibility of spalling. Moreover, utilizing both supplementary cementitious materials with recycled concrete aggregate can improve the fire resistance of concrete. The incorporation of pulverized fly ash and slag in Portland cement or blended cement can generally keep the mechanical properties of concrete at a higher level after heating to a high temperature.
Originality/value
Recycled concrete aggregate enhances the concrete behaviour at high temperatures when it substitutes the natural aggregate by reasonable substitution (more than 25–30%). It also almost eliminates the possibility of spalling. Moreover, utilizing both supplementary cementitious materials with recycled concrete aggregate can improve the fire resistance of concrete. The incorporation of pulverized fly ash and slag in Portland cement or blended cement can generally keep the mechanical properties of concrete at a higher level after heating to a high temperature.
Keywords
Citation
Abed, M.A. and Lubloy, E. (2022), "Understanding the effect of recycled concrete aggregate and cementitious materials on concrete's fire resistance", Journal of Structural Fire Engineering, Vol. 13 No. 4, pp. 421-432. https://doi.org/10.1108/JSFE-09-2021-0056
Publisher
:Emerald Publishing Limited
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