微波加热集料的传热特性及其影响因素

doi:10.11896/cldb.21110074

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Abstract Aggregate is an important dielectric material for self-healing of asphalt mixture heated by microwave. The electromagnetic parameters of limestone, basalt and steel slag aggregates, the heating response of aggregates during microwave heating process and the effects of aggregate particle size, steel slag content, chemical composition and phase composition on the heat transfer performance of aggregates were studied by vector network analysis test, industrial box microwave oven microwave heating test, XRD and XRF analysis, and the correlation between aggregate and asphalt mixture microwave heating heat transfer performance was analyzed.The results show that the electromagnetic parameters of steel slag are significantly higher than those of limestone and basalt, indicating that its electromagnetic wave absorption effect is better. Compared with limestone and basalt, steel slag has better microwave heating heat transfer performance because of its high content of ferric oxide. Particle size, steel slag content and water content are the main factors affecting the heat transfer performance of aggregate by microwave heating.With the increase of particle size and steel slag content, the heat transfer performance of aggregate increases. Compared with dry aggregates, the microwave heating rate of aggregates with water content of 0.3%—1.0% decreased by 40%—50%. The linear relationship equation between surface temperature of aggregates with different water content and steel slag content and heating time under microwave heating has been constructed. The correlation coefficients are all greater than 0.90, and the fitting effect is good.XRD and XRF analysis show that compared with limestone and basalt, steel slag has the highest content of active metal compounds and better sensitivity to microwave heating. The microwave heating test shows that the decreasing order of microwave absorption capacity is steel slag, steel slag asphalt mixture and ordinary asphalt mixture. The heat transfer performance of steel slag heated by microwave is better than that of steel slag asphalt mixture and ordinary asphalt mixture.

Key words： road engineering aggregate steel slag microwave heating heating performance

Published: 25 April 2023 Online: 2023-04-24

CLC number:

U416.217

Fund:Science and Technology Project of Department of Transportation of Hebei Province (QC2018-3), National & Local Joint Engineering Laboratory of Traffic Civil Engineering Materials of Chongqing Jiaotong University Funded Project (LHSYS-2021-002), and Joint Training Base Construction Project for Graduate Students in Chongqing(JDLHPYJD2021011).

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	ZHANG Qingyu
	LUO Jing
	ZHAO Yi
	LIU Ying
	ZHANG Xinyong

Cite this article:

ZHANG Qingyu,LUO Jing,ZHAO Yi, et al. Heat Transfer Characteristics and Its Influencing Factors of Aggregate Heated by Microwave[J]. Materials Reports, 2023, 37(8): 21110074-8.

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http://www.mater-rep.com/EN/10.11896/cldb.21110074 OR http://www.mater-rep.com/EN/Y2023/V37/I8/21110074

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