Characterization of interlayer bonding in asphalt pavement based on direct tension test with horizontal loading(PDF)
长安大学学报（自然科学版）[ISSN:1006-6977/CN:61-1281/TN]
- Issue:
- 2017年03期
- Page:
- 16-23
- Research Field:
- 道路工程
- Publishing date:
Info
- Title:
- Characterization of interlayer bonding in asphalt pavement based on direct tension test with horizontal loading
- Author(s):
- LIU Hong-po AI Chang-fa; RAHMAN Ali; GAO Xiao-wei; QIU Yan-jun
- 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; 3. Department of Civil Engineering, Shahid Chamran University, Ahvaz 83151-61357, Khuzestan, Iran
- Keywords:
- road engineering; asphalt pavement; direct tension test (DTT); interface; bonding strength; horizontal loading
- PACS:
- U416.224
- DOI:
- -
- Abstract:
- To research the interface bond characteristics of asphalt pavement under traffic loading, this paper carried out the test to estimate bonding strength between asphalt layers via direct tension test (DTT) which can apply horizontal shear load. By the orthogonal test, this paper not only tested the interface bonding strength of asphalt mixture composite specimen under different temperature, shear load and tack coat application rate, but also analyzed the influence law of each factor on the bonding strength, and the influence degree of each factor was determined by sensitivity analysis. What’s more, the multiple nonlinear regression method and SPSS statistical software were used to analyze the relationship between interface bonding strength and temperature, shear load and tack coat application rate. And the prediction models describing interface bonding strength under the combined effect of tension and shear stress at three different temperature levels including low temperature, middle temperature and high temperature were proposed and their feasibility was demonstrated. The results show that the interface bonding strength reduces once the shear load be applied, and the bonding strength decreases to 1/3 of the original value when the tack coat application rate is 0.8 kg/m2 and the horizontal shear load increases from 0 MPa to 0.2 MPa. With the increase of shear load, the interface bonding strength increases and then decreases with the increase of tack coat dosage, but the degree of influence is gradually weakened. The bonding strength reaches the maximum value when the tack coat dosage is within the range of 0.8 to 1.0 kg/m2. Moreover, the interface bonding strength decreases sharply with the increase of temperature, and the higher the temperature, the greater the effect of horizontal shear load on the interface bonding strength. Once the temperature reaches 50 ℃ and the shear load is 0.2 MPa, the interface bonding strength decreases to the value of 0 MPa. The decreasing tendency of the interlayer bonding strength is not the same in different temperature ranges. At low temperatures, there is a sudden fall in bond strength and it continues to drop steadily at medium temperatures, and finally decreases slowly at high temperatures. Influence of each factor on the interlayer bonding strength in descending order is temperature, shear load and tack coat application rate.
Last Update: 2017-06-06