Journal
INSIGHT
Volume 55, Issue 11, Pages 596-604Publisher
BRITISH INST NON-DESTRUCTIVE TESTING
DOI: 10.1784/insi.2012.55.11.596
Keywords
Laboratory ageing; non-destructive tests; acoustic emission; ultrasonics; disc-shaped compact tension (DC(T)) test
Funding
- National Cooperative Highway Research Programme - Ideas Deserving Exploratory Analysis (NCHRP-IDEA) programme
Ask authors/readers for more resources
Asphalt concrete mixtures with different levels of oxidative ageing, prepared by oven-ageing the mixture at 135 degrees 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 degrees 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-of-change 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 disc-shaped compact tension (DC(T)) fracture tests.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available