Evaluation of Crack Resistance of Post-doping Warm-mix Epoxy Asphalt Mixture Based on IDEAL-CT Test
CHEN Fei1, LI Xianyan2, GAO Jiagui3, WANG Yongjun4, ZHANG Linyan1,*, FENG Jiliang5
1 School of Architecture and Planning, Yunnan University, Kunming 650000, China 2 Yunnan Binnan Expressway Co., Ltd., Dali 671000, Yunnan, China 3 Yunnan Communications Investment and Construction Group Co., Ltd., Kunming 650000, China 4 Zhaotong Zhaole Expressway Investment and Development Co., Ltd., Zhaotong 657000, Yunnan, China 5 Yunnan Changtan Technology Co., Ltd., Kunming 650000, China
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.
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2023, Vol. 37 
