Journal
CONSTRUCTION AND BUILDING MATERIALS
Volume 341, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.conbuildmat.2022.127859
Keywords
Concrete; Microwave heating; Conventional heating; Strength weakening; Energy consumption; Recycled coarse aggregate
Categories
Funding
- National Natural Science Foundation of China [11872287]
- Found of Shaanxi Key Research and Development Program [2019ZDLGY01-10]
- China Postdoctoral Foundation Project [2019M663934XB, 2021MD703868]
- Natural Science Foundation of Shaanxi Province [2020JQ-662]
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Microwave-assisted concrete coarse aggregate recycling technology is of great significance to environmental protection and sustainable development in the construction industry. The study on the heating effect of concrete under different heating paths revealed that microwave heating has advantages in promoting crack development, weakening concrete strength, and releasing high-quality recycled coarse aggregate.
Microwave-assisted concrete coarse aggregate recycling technology is considered as a potential concrete recycling technology, which is of great significance to environmental protection and sustainable development of the construction industry. In order to study the damage evolution process of concrete and the properties of recycled coarse aggregate (RCA) under microwave and conventional irradiation, the heating effect of concrete under different heating paths was studied. The heating efficiency, crack propagation law, failure mode and energy consumption of concrete under different heating conditions were obtained. The uniaxial compressive strength (UCS) test was carried out after heat treatment to explore the concrete strength weakening law. The apparent density, water absorption, point load strength and surface micro-crack characterization of RCA after heat treatment were comprehensively analyzed. The results show that microwave heating technology has greater advantages than conventional heating methods that can effectively promote the development of interfacial cracks between mortar and aggregate, weaken the strength of concrete and liberate high-quality RCA under certain conditions. The research results can provide reference and contribution for microwave-assisted concrete crushing and aggregate recovery process.
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