Bending Characteristics for Asphalt Concrete Beams with Bond Interface

The shear characteristics of bond interface in asphalt concrete (AC) has been widely studied along with the effects of bonding conditions on pavement mechanical responses. However, no study has been focused on the bending characteristics for asphalt concrete with bond interface between layers. This paper investigates the bending characteristics for AC beams with bond interface using a three-point bonded beam bending test. For comparison, bending test for integrated beam without bonding interface is also conducted. Bending strain test and bending fatigue test are performed for bonded specimen using a medium setting modified asphalt emulsion tack coat. Bending strain resistance and bending fatigue life are measured. The influence of tack coat application rate, temperature, and loading level on AC layer bending characteristics are investigated. The results show that an optimum application rate of tack coat is desired. At optimal rate, the integrity and bending properties of AC layers are enhanced. However, it is found that different test methods and different testing temperatures can result in different optimum application rate. Finally, a fatigue regression model for bonded hot mix asphalt (HMA) layers is developed based on three factors including application rate, testing temperature, and loading level.

• Supplemental Notes:
  • This paper was sponsored by TRB committee AFK40 Characteristics of Asphalt-Aggregate Combinations to Meet Surface Requirements.
• Corporate Authors:

  Transportation Research Board

  500 Fifth Street, NW
  Washington, DC  United States  20001
• Authors:
  • Ai, Changfa
  • Qiu, Yanjun
  • Li, Joshua Q
  • Wang, Kelvin C P
  • Yang, Enhui
• Conference:
  • Transportation Research Board 93rd Annual Meeting
  • Location: Washington DC
  • Date: 2014-1-12 to 2014-1-16
• Date: 2014

Language

• English

Media Info

• Media Type: Digital/other
• Features: Figures; Photos; References; Tables;
• Pagination: 18p
• Monograph Title: TRB 93rd Annual Meeting Compendium of Papers

Subject/Index Terms

• TRT Terms: Asphalt concrete; Bonding; Fatigue (Mechanics); Pavement layers; Regression analysis; Tack coats
• Uncontrolled Terms: Bending beam tests
• Subject Areas: Design; Highways; Materials; Pavements; I22: Design of Pavements, Railways and Guideways; I31: Bituminous Binders and Materials;

Filing Info

• Accession Number: 01518444
• Record Type: Publication
• Report/Paper Numbers: 14-4420
• Files: TRIS, TRB, ATRI
• Created Date: Mar 19 2014 11:04AM