Accelerated Aging Kinematics of Asphalt by Ultraviolet Photooxidation Considering Moisture and Condensation Effects

In order to understand the long-term performance degradation of asphalt, ultraviolet (UV) photo-oxidation has been used to accelerate the aging process. Three types of asphalt binders extracted from reclaimed asphalt pavements (RAPs) and one extracted from fresh Hot Mix Asphalt (HMA) were aged under continuous UV exposure and UV/moisture/condensation exposure. After accelerated aging tests, the weight percentages of oxygen (WPO) in all samples were measured using energy-dispersive X-ray spectroscopy (EDX). The testing results indicate that the asphalt binder aging rate under both UV and UV/moisture/condensation are fast at the beginning and stabilize after a certain period. The experimental results have also been modeled by two classic asphalt aging models, namely the fast-rate – constant-rate (FRCR) and nonlinear differential dynamic (NDD) models. Based on the modeling results, the NDD model agreed with the experimental results from both the UV aging and UV/moisture/condensation aging samples well, while the FRCR model fit the UV/moisture/condensation aging better than the NDD model and is recommended for future UV/moisture/condensation aging performance prediction. Additionally, although exposed under UV for the same time period, the WPO in samples after UV/moisture/condensation aging were lower than those in samples after continuous UV aging. This indicates that condensation and moisture reduce the UV-induced photo-oxidative aging rate.

• Supplemental Notes:
  • This paper was sponsored by TRB committee AFK20 Standing Committee on Asphalt Binders. Alternate title: Accelerated Aging Kinematics of Asphalt by UV Photo-oxidation Based on EDX Tests Considering Moisture and Condensation Effects.
• Corporate Authors:

  Transportation Research Board

  500 Fifth Street, NW
  Washington, DC  United States  20001
• Authors:
  • He, Xin
  • Hochstein, Daniel
  • Ge, Qi
  • Ali, Ayman W
  • Chen, Fangliang
  • Yin, Huiming
• Conference:
  • Transportation Research Board 96th Annual Meeting
  • Location: Washington DC, United States
  • Date: 2017-1-8 to 2017-1-12
• Date: 2017

Language

• English

Media Info

• Media Type: Digital/other
• Features: Figures; Photos; References; Tables;
• Pagination: 23p
• Monograph Title: TRB 96th Annual Meeting Compendium of Papers

Subject/Index Terms

• TRT Terms: Accelerated tests; Aging (Materials); Asphalt; Bituminous binders; Condensation; Hot mix asphalt; Kinematics; Mathematical models; Reclaimed asphalt pavements; Ultraviolet light
• Uncontrolled Terms: Energy dispersive x-ray spectroscopy; Moisture conditioning; Photo-oxidation
• Subject Areas: Highways; Materials; Pavements;

Filing Info

• Accession Number: 01628574
• Record Type: Publication
• Report/Paper Numbers: 17-00109
• Files: TRIS, TRB, ATRI
• Created Date: Mar 7 2017 5:27PM