基于IDEAL-CT试验评价后掺法温拌环氧沥青混合料抗裂性能

doi:10.11896/cldb.22040288

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Abstract Thin-layer epoxy asphalt can achieve long-life pavement under relatively economical conditions, and the post-doping process overcomes the problem of limited application due to its harsh construction requirements, can achieve large-scale application and has broad application prospects. The crack resistance of the epoxy asphalt mixture prepared by the indoor simulated post-doping method was evaluated by the asphalt indirect tensile cracking test (IDEAL-CT). Taking the maximum load, maximum displacement, absolute value of the slope of the load-displacement curve at 75% of the maximum load (m₇₅), and crack resistance index (CT) as the evaluation indicators, the effect of fiber and asphalt types, the nominal maximum size of aggregate, asphalt dosages and void on the crack resistance of the mixture was investigated, and the rationality of the evaluation index of its crack resistance was explored. The results show that adding fiber and increasing oil content to epoxy asphalt mixture can delay the development of cracks, and improve its crack resistance, among which basalt fiber has the best crack resistance; the performance is negatively correlated with the nominal maximum size of aggregate. At the same time, the crack resistance of the dense skeleton-type mixture is better than that of the suspension dense type; the mixture becomes denser, the deformation resistance is reduced, the crack propagation speed is accelerated, and the crack resistance is reduced; compared with SBS-modified asphalt, epoxy asphalt has stronger resistance to load cracking, but poorer resistance to crack extension. When applied to structures that may experience large deformation or uneven settlement, care should be taken to prevent cracks from occurring. In terms of evaluation indicators, the maximum displacement has poor sensitivity to the evaluation of the crack resistance of epoxy asphalt mixtures, which is not suitable for evaluating the crack resistance of thermosetting asphalt materials.

Key words： warm-mix epoxy asphalt post-doping method crack resistance influencing factors IDEAL-CT

Published: 25 October 2023 Online: 2023-10-19

CLC number:

U416.2

Fund:Yunnan Transportation Science and Technology Project (YJKJ [2020] No.113).

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	Articles by authors
	CHEN Fei
	LI Xianyan
	GAO Jiagui
	WANG Yongjun
	ZHANG Linyan
	FENG Jiliang

Cite this article:

CHEN Fei,LI Xianyan,GAO Jiagui, et al. Evaluation of Crack Resistance of Post-doping Warm-mix Epoxy Asphalt Mixture Based on IDEAL-CT Test[J]. Materials Reports, 2023, 37(20): 22040288-7.

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http://www.mater-rep.com/EN/10.11896/cldb.22040288 OR http://www.mater-rep.com/EN/Y2023/V37/I20/22040288

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