Characterization of interface shear fatigue in asphalt pavement based on direct shear test with vertical loading(PDF)
长安大学学报（自然科学版）[ISSN:1006-6977/CN:61-1281/TN]
- Issue:
- 2019年03期
- Page:
- 19-26
- Research Field:
- 道路工程
- Publishing date:
Info
- Title:
- Characterization of interface shear fatigue in asphalt pavement based on direct shear test with vertical loading
- Author(s):
- HUANG Hengwei; RAHMAN Ali; HUANG Yangquan; AN Shaoke; AI Changfa
- （1. School of Civil Engineering， Southwest Jiaotong University, Chengdu 610031, Sichuan, China; 2. Key Laboratory of Highway Engineering of Sichuan Province, Southwest Jiaotong University, Chengdu 610031, Sichuan, China）
- Keywords:
- road engineering; asphalt pavement; interface; compression direct shear test; composite asphalt beam; shear fatigue
- PACS:
- -
- DOI:
- -
- Abstract:
- In order to study the interlayer shear fatigue characteristics of an asphalt pavement under vehicular loading, the shear fatigue life of doublelayered composite asphalt beam samples with an interface was tested, and a loading device that independently developed for compressiondirect shear test was used. By change the factors of three test temperatures (25 ℃, 35 ℃, 45 ℃), two tack coat dosages (0.3, 0.5 L/m2), five shear stresses (0, 0.03, 0.06, 0.1, 0.2 MPa) and four types of compressive stress levels (0.16, 0.18, 0.2, 0.22 MPa)，the influence of the above factors on the interface shear fatigue life of composite beam samples was studied. The results show that as the temperature increases from 25 ℃ to 45 ℃, the interlayer shear fatigue life reduces by 47.12% and 72.79%, when 0.3 and 0.5 L/m2 tack coat dosages are applied, respectively. Further, the interface shear fatigue life is more sensitive to temperature changes when the dosage of the tack coat is higher. The variation in the fatigue life at an intermediate temperature range ［25 ℃, 35 ℃) is larger than that at the high temperature range ［35 ℃, 45 ℃］. As the compressive stress level increases, the interface shear fatigue life increases gradually. However, the increasing trend gradually decreases with temperature increasing. When the temperature reaches 45 ℃ and the compressive stress is 0.2 MPa, the interlayer shear fatigue life is only 521.8 s. The failure rate of the interface shear fatigue life at 25 ℃, 35 ℃, and 45 ℃ is k1, k2, and k3, respectively. When the shear stress increased, the failure rate ranked as k2>k1 and k2>k3. Furthermore, the effect of shear stress on the interface shear fatigue life was not obvious at normal temperatures (25 ℃), but at the high temperature condition (45 ℃), the overall level of the interlayer shear fatigue life was lower, and the attenuation effect of the interlayer shear fatigue life was not obvious when the shear stress increased. 3 tabs, 6 figs, 27 refs.
Last Update: 2019-05-23