Affiliation of Author(s):民航学院
Journal:Jiaotong Yunshu Gongcheng Xuebao
Abstract:In order to analyze the lateral flow deformation of asphalt mixture, a rutting test of asphalt mixture was conducted, and the law of lateral strain on the surface of asphalt mixture was researched by using the fiber Bragg grating (FBG) sensor installed on the slab surface of asphalt mixture. With the maximum strain and the absolute value of lateral strain rate in creep stability stage as evaluation indexes, the lateral flow deformation of asphalt mixture was analyzed. Analysis result indicates that the lateral flow deformation decreases with the decreases of both the maximum strain of asphalt mixture and the absolute value of lateral strain rate. The lateral flow deformation develops continuously under the action of cyclic loading. The nearer the test point to the wheel, the heavier its flow deformation is. When the rubber powder contents are 0, 15% and 18%, the lateral strain rates at test point with a distance of 63 mm to the wheel are 6.8×10-6, 4.0×10-7 and 6.4×10-6 min-1, respectively. Therefore, the asphalt mixture with 15% rubber powder content has larger capacity to resist lateral flow deformation in high temperature. For the asphalt mixtures with 15% rubber powder content, when their aggregate gradations are selected as coarse gradation of AC-13 and fine gradation of AC-13, the lateral strain rates at test point with a distance of 28 mm to the wheel are 6.0×10-7 and 7.7×10-6 min-1, respectively, so the anti-lateral flow deformation capability of AC-13 coarse-graded mixture in high temperature is better than that of AC-13 fine-graded mixture. The maximum strain of rubber powder modified asphalt mixture is 1.96×10-4, but for the asphalt mixture modified by rubber powder and rutting resistance additive, the value is only 1.22×10-4, which shows that under the condition of high temperature, the asphalt mixture modified by rubber powder and rutting resistance additive has higher overall structural strength and can bear the direct effect from the wheel load without lateral movement to both sides, which could cause larger lateral flow deformation. The evaluation of lateral flow deformation to asphalt mixture based on the FBG lateral strain can well illustrate the effect of different material and gradation characteristics on the lateral flow deformation of asphalt pavement. 7 tabs, 10 figs, 30 refs. © 2019, Editorial Department of Journal of Traffic and Transportation Engineering. All right reserved.
ISSN No.:1671-1637
Translation or Not:no
Date of Publication:2019-08-01
Co-author:Wei, Lu-Nan,Hou, Yan-Ming
Correspondence Author:gjq