Abstract: In order to study the prediction model of fracture-healing property of asphalt mixture, in this paper, 70# matrix asphalt and SBS modified asphalt were used to make AC-13 mixture semi-circular specimen. The load-displacement curves were obtained through the semi-circular bending test (SCB), and the cracked semi-circular specimen was spliced and placed in an oven for healing. The secondary loading was applied to the healed specimen. The peak load ratio after and before healing was used as the healing index (HI) to evaluate the fracture-healing property of the mixture. According to the capillary flow principle, the prediction model of asphalt mixture healing was established, and it was used to fit the test results. The conversion equation between healing time and temperature during HI fixation was established by fitting equation. The results show that the fractured asphalt mixture has the secondary bearing capacity after healing in a specific environment. Although the HI value is less than 1.0, it can reach 0.7 in the healing condition of 100 ℃ &12 h, That is, the tensile strength recovers by 70% after healing; When the healing time is from 4 h to 8 h and 8 h to 12 h, the HI growth rate of 70# AC-13 asphalt mixture in 100 ℃ are 0.096/h and 0.023/h, respectively. The HI growth rate of SBS AC-13 asphalt mixture are 0.096/h and 0.009/h, respectively, it shows that HI increases with the increase of healing time, but the growth rate increases first and then decreases. A function HI(t)=(-1+e-Ct)2(C＞0)can be used to fit the change of healing index with healing time at different healing temperatures, and the fitting coefficient is R2＞0.90. Based on the principle of time-temperature equivalence, a transition model t(T)=C3·eC4/T(0＜C3＜1,0＜C4, R2>0.95) between healing temperature and healing time is established.
1 Huang W D, Li B L, Huang M. Journal of Building Materials, 2015, 18(4), 572(in Chinese). 黄卫东, 李本亮, 黄明.建筑材料学报, 2015, 18 (4), 572. 2 Dong R K, Zheng M, Huang W D, et al. China Journal of Highway and Transport, 2015, 28(5), 87(in Chinese). 董瑞琨, 郑茂, 黄卫东, 等.中国公路学报, 2015, 28 (5), 87. 3 Zhu H Z, Fan S P, Li Z H. Journal of Building Materials, 2018, 21(3), 426(in Chinese). 朱洪洲,范世平,李正浩.建筑材料学报, 2018,21(3), 426. 4 Bazin P, Saunier J. In: Deformability, Proceeding of the Second International Conference on the Structural Design of Asphalt Pavement. Ann Arbor, 1967, pp. 438. 5 García . Fuel, 2012, 93, 264. 6 Bhasin A, Little D N, Bommavaram R, et al. Road Materials and Pavement Design, 2008, 9(sup1), 219. 7 Wool R P, O'Connor K M. Journal of Applied Physics, 1981, 52(10), 5953. 8 He L, Li G, Lv S, et al. Construction and Building Materials, 2020, 254, 119225. 9 Sun D Q, Zhang L W, Liang G. Petroleum Asphalt, 2011, 25 (5), 7 (in Chinese). 孙大权, 张立文, 梁果.石油沥青, 2011, 25(5), 7. 10 Qiu J, Ven M, Wu S, et al. Experimental Mechanics, 2012, 52(8), 1163. 11 Cui Y N, Li X S, Wu H X, et al. Journal of Building Materials, 2021, 24(2), 432 (in Chinese). 崔亚楠,李雪杉,吴华信,等.建筑材料学报, 2021, 24(2), 432. 12 Huang M, Wang X, Huang W D. China Journal of Highway and Transport, 2013,26 (4). 16 (in Chinese). 黄明,汪翔,黄卫东.中国公路学报, 2013,26 (4), 16. 13 Huang W D, Lin P, Zheng M, et al. Journal of Building Materials, 2016, 19 (5), 950 (in Chinese). 黄卫东, 林鹏, 郑茂,等.建筑材料学报, 2016, 19 (5), 950. 14 Dai Q, Wang Z, Hasan M R M. Construction and Building Materials, 2013, 49 (12), 729. 15 García A, Bueno M, Norambuena-Contreras J, et al. Construction and Building Materials, 2013,49,1. 16 Phan T M, Park D W, Le T H M. Construction and Building Materials, 2018, 180, 503. 17 He L, Zhao L, Ling T Q, et al. China Journal of Highway and Transport, 2017, 30 (1), 17 (in Chinese). 何亮, 赵龙, 凌天清, 等.中国公路学报, 2017, 30 (1), 17. 18 Tian Y, Pang Q, Sun G Q, et al. Petroleum Asphalt, 2016,30(5), 27(in Chinese). 田洋,庞琦,孙国强, 等.石油沥青,2016,30(5), 27. 19 Gallego J, Val M A D. Contreras V, et al. Construction and Building Materials, 2013,42(42), 1. 20 Xu C. Study on self-healing characteristics and influencing factors of asphalt. Master's Thesis, Chongqing Jiaotong University, China, 2013 (in Chinese). 徐辰. 沥青自愈合特性及影响因素研究. 硕士学位论文,重庆交通大学,2013. 21 Hamraoui A, Thuresson K, Nylander T, et al. Journal of Colloid and Interface Science, 2000, 226, 199. 22 Hamraoui A, Nylander T. Journal of Colloid and Interface Science, 2002,250, 415.
渝公网安备50019002502923号 版权所有：《材料导报》编辑部
2021, Vol. 35 
