Journal
CONSTRUCTION AND BUILDING MATERIALS
Volume 286, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.conbuildmat.2021.122944
Keywords
Concrete coarse aggregates; Crack propagation; Fracture behavior; Microwave irradiation; Temperature gradient
Categories
Funding
- National Natural Science Foun-dation of China [11872287]
- Found of Shaanxi Key Research and Development Program [2019ZDLGY0110]
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This study found that ilmenite heated more rapidly during microwave heating tests, resulting in larger temperature gradients and more severe damage in basalt due to its higher ilmenite content, leading to more severe fractures occurring at higher power levels.
Significant damage of some coarse aggregates due to microwave irradiation is neglected by most previous studies on microwave-assisted concrete recycling technique. Fracture behavior of commonly used coarse aggregates: granite and basalt were investigated by microwave heating tests. Heating rate of aggregates' mineral components was tested respectively. Ilmenite was heated rapidly while other minerals were heated tardily. Larger temperature gradient was generated in basalt because of more ilmenite content to induce fracture, granite was not fractured yet. Most initial cracks in basalt extended along clockwise angle in Mode I. Fracture of basalt occurred with more damage at higher power level. (c) 2021 Elsevier Ltd. All rights reserved.
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