Characterisation of oxidative ageing in asphalt concrete - Part 1: Ultrasonic velocity and attenuation measurements and acoustic emission response under thermal cooling

M. E. McGovern, B. Behnia, W. G. Buttlar, H. Reis

Research output: Contribution to journalArticlepeer-review

Abstract

Asphalt concrete mixtures with different levels of oxidative ageing, prepared by oven-ageing the mixture at 135°C for different amounts of time, were used to study the effects of oxidative ageing upon the ultrasonic velocity and attenuation measurements. The embrittlement temperatures, ie low-temperature cracking, of the mixtures with different amounts of oven-aged times were also evaluated by monitoring the acoustic emission response of the specimens when cooled from room temperature to -50°C. It was observed that the embrittlement temperature increases (ie the onset of embrittlement occurs at a warmer temperature) as the amount of ageing increases. However, the rate-ofchange of the embrittlement temperatures with ageing time increases gradually until 24 h of ageing, after which the rate of change significantly increases. It was also observed that both the dilatational and shear velocities increase up to approximately 24 h of ageing, after which they significantly decrease with ageing. Also, both the dilatational and shear attenuation decrease with ageing up to around 24 h of ageing, after which both attenuations strongly increase. The results from both ultrasonic and acoustic emission tests are consistent with results obtained using the mechanical discshaped compact tension (DC(T)) fracture tests.

Original languageEnglish (US)
Pages (from-to)596-604
Number of pages9
JournalInsight: Non-Destructive Testing and Condition Monitoring
Volume55
Issue number11
DOIs
StatePublished - Nov 2013

Keywords

  • Acoustic emission
  • Disc-shaped compact tension (DC(T)) test
  • Laboratory ageing
  • Non-destructive tests
  • Ultrasonics

ASJC Scopus subject areas

  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry

Fingerprint Dive into the research topics of 'Characterisation of oxidative ageing in asphalt concrete - Part 1: Ultrasonic velocity and attenuation measurements and acoustic emission response under thermal cooling'. Together they form a unique fingerprint.

Cite this