Abstract

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Title:: Evaluation on low temperature anti-cracking performance of modified asphalt based on critical crack tip opening displacement

Author(s):: CHEN Chang-kun; YANG Fu-she; WANG Jian-jun; (1.School of Highway, Chang’an University, Xi’an 710064, Shaanxi, China; 2. School of Science, Chang’an University, Xi’an 710064, Shaanxi, China)

Keywords:: road engineering; modified asphalt; low temperature anti-cracking performance; fracture behavior; critical crack tip opening displacement; resistance to crack propagation

Abstract:: To evaluate the low temperature anti-cracking performance of modified asphalt, force ductility testing machine with data acquisition system and self-made silicone rubber mold were used to carry out the precracked compact tensile test on seven different types of modified asphalts so as to test the fracture behavior of asphalt under low temperature conditions, and crack tip opening displacement was considered as the index of measuring the low temperature anti-cracking performance of modified asphalt to examine the relationship between the fracture mechanics parameters and the freezing temperature of asphalt mixture through indoor TSRST test. The results show that the precracked compact tensile test can discriminate low temperature of asphalt more exactly; the proposed index can reflect the asphalt’s resistance to crack propagation under brittle low-temperature conditions, which is more suitable to be the evaluation index of low temperature anti-cracking performance of asphalt; the results of indoor asphalt mixture TSRST test also proves the rationality of the proposed method and index.