Oxidative aging of long-life asphalt pavements in Hong Kong

Yuhong Wang, Yong Wen, Kecheng Zhao, Jianming Wei, Hainian Wang, Alvin S.T. Wong

Research output: Chapter in book / Conference proceedingConference article published in proceeding or bookAcademic researchpeer-review

Abstract

Hong Kong (HK) is currently developing a new flexible pavement design standard with the goal of building long-life pavement in the future. Long-life pavement is expected to last for at least 40 years without major structural damage. The design of long-life flexible pavement has been traditionally focused on structural design, in particular the control of tensile strain at the bottom of Asphalt Concrete (AC) layer and compressive strain at the top of subgrade. Changes of fundamental asphalt binder properties and performance due to its oxidative aging throughout the pavement structure often receive little attention. However, understanding the evolution of asphalt binder properties is critically important for long-life pavement design. It not only affects the load-induced mechanistic responses of the flexible pavement system, but also the fracture and cracking potentials of the binder per se. In this study, AC samples were taken from a heavily trafficked road in HK that has been in service for 36 years with only being periodically resurfaced. The cores were cut into six slices and asphalt binders were extracted and recovered for the analysis of their aging characteristics by using Gel Permeation Chromatography (GPC), Fourier Transform Infrared spectroscopy (FTIR), and Dynamic Shear Rheometer (DSR). The analysis results indicate that oxidative aging penetrates deep into the asphalt pavement layers, but there are variations in the extent of aging. In general, asphalt binder is severely aged at different depths, but at certain locations it exhibits less aging. The causes of the aging variations need to be further researched.
Original languageEnglish
Title of host publicationAsphalt Pavements - Proceedings of the International Conference on Asphalt Pavements, ISAP 2014
PublisherTaylor and Francis - Balkema
Pages191-200
Number of pages10
Volume1
ISBN (Print)9781138027121
Publication statusPublished - 1 Jan 2014
Event12th International Conference on Asphalt Pavements, ISAP 2014 - Raleigh, NC, United States
Duration: 1 Jun 20145 Jun 2014

Conference

Conference12th International Conference on Asphalt Pavements, ISAP 2014
Country/TerritoryUnited States
CityRaleigh, NC
Period1/06/145/06/14

Keywords

  • Dynamic Shear Rheometer
  • Fourier Transform Infrared spectroscopy
  • Gel Permeation Chromatography
  • Long-life pavement
  • Oxidative aging

ASJC Scopus subject areas

  • Building and Construction
  • Architecture

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