煤矸石粉/聚酯纤维沥青混合料低温抗裂性研究

doi:10.11896/cldb.19100146

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Abstract In order to study the effect of coal gangue powder, polyester fiber and reflective crack on the low temperature crack resistance of asphalt mixture, the low temperature crack resistance of asphalt mixture was studied by three-point bending loading test. In the test, asphalt mixture specimens were processed into semi-circular disc with no pre-cut and pre-notch (simulated reflection cracks) offset center 0 mm, 10 mm, 20 mm on the bottom. Five replacement rates of coal gangue powder were selected as 0%, 25%, 50%, 75%, 100%, and six kinds of polyester fiber content were chosen as 0%, 0.3%, 0.35%, 0.4%, 0.45%, 0.5%. The improvement mechanism of coal gangue powder and polyester fiber on low tempe-rature crack resistance of asphalt mixture was analyzed by SEM. Through experiments, the optimum amount of polyester fiber is 0.4% for SCB specimens with no pre-cut, and the optimum replacement rate of coal gangue powder is 50%; for SCB specimens with pre-cut, the optimum do-sage of polyester fibers ranges from 0.38% to 0.42%. With the increase of the offset distance of the pre-cut, the ultimate load of the asphalt mixture gradually decreases, and the semi-circular disc is more likely to be destroyed. The microscopic mechanism analysis shows that the incorporation of coal gangue powder makes the filler grading further refined, which is more conducive to improving the crack resistance of the asphalt mixture. At the same time, the polyester fiber can fully form a grid that evenly overlaps each other in the asphalt mixture and asphalt mixture has the best low temperature crack resistance. Therefore, the addition of coal gangue powder and polyester fiber can reduce the damage of reflective cracks to the low temperature crack resistance of asphalt mixture.

Key words： asphalt mixture coal gangue powder polyester fiber pre-cut position SCB test

Published: 23 March 2021

CLC number:

U414

Fund:Key Research Projects of Natural Science in Colleges and Universities of Anhui Province (KJ2017A096).

About author:: Jinrong Wu, a professor at Anhui University of Science and Technology, a graduate tutor, and an outstanding teacher in Anhui Province. Since joining the work in 2001, she had published more than 40 papers in domestic and foreign academic journals. Mainly engaged in the research of asphalt pavement structure and materials. Hosted or participated in a number of provincial and ministerial scientific research projects. More than 20 masters have been trained.
Shancheng Cui, a graduate student at Anhui University of Science and Technology since September 2018. Mainly engaged in the research of pavement and asphalt mixtures.

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	WU Jinrong
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	LI Fei
	HONG Rongbao

Cite this article:

WU Jinrong,CUI Shancheng,LI Fei, et al. Study on Low Temperature Crack Resistance of Coal Gangue Powder/Polyester Fiber Asphalt Mixture[J]. Materials Reports, 2021, 35(6): 6078-6085.

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http://www.mater-rep.com/EN/10.11896/cldb.19100146 OR http://www.mater-rep.com/EN/Y2021/V35/I6/6078

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