Experimental Study of the Heating Potential of Mortar-Aggregate under Microwave Irradiation
Publication: Journal of Materials in Civil Engineering
Volume 33, Issue 7
Abstract
Microwave heating is a novel and promising method to remove mortar that adheres to aggregates in recycled concrete. A systematic experiment was carried out to evaluate the heating results of mortar-aggregate composite materials after microwave heating with different power and irradiation times. It was revealed that the surface temperature and heating rates of the mortar and aggregate linearly increased with the irradiation time and powers level. After microwave treatment, macrocracks generated along the mortar–aggregate interface and penetrated the mortar matrix until the mortar broke. Moreover, based on the push-out tests, it was found that the interface bond strength of mortar-aggregate after microwave treatment was much lower than that of the untreated specimens. The influence of the temperature difference on the residual bond strength is also discussed in this study. The parametric study confirmed that the bonding strength between mortar and aggregate after microwave heating is reduced. This experimental investigation could provide a basis and reference for microwave-assisted concrete recycling for industrial applications.
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Data Availability Statement
All data, models, and code generated or used during the study appear in the published article.
Acknowledgments
The authors gratefully acknowledge this supports provided by the National Natural Science Foundation of China (Grant No. 11872287), and the Found of Shaanxi Key Research and Development Program (Grant No. 2019ZDLGY01-10).
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Journal of Materials in Civil Engineering
Volume 33 • Issue 7 • July 2021
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© 2021 American Society of Civil Engineers.
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Received: Mar 24, 2020
Accepted: Dec 1, 2020
Published online: Apr 28, 2021
Published in print: Jul 1, 2021
Discussion open until: Sep 28, 2021
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