Characterization of oxidative aging in asphalt concrete pavements using its complex moduli

Megan McGovern; Behzad Behnia; Brian Hill; William G. Buttlar; Henrique Reis

doi:10.1117/12.2044781

9 March 2014 Characterization of oxidative aging in asphalt concrete pavements using its complex moduli

Megan McGovern, Behzad Behnia, Brian Hill, William G. Buttlar, Henrique Reis

Proceedings Volume 9064, Health Monitoring of Structural and Biological Systems 2014; 90641Q (2014) https://doi.org/10.1117/12.2044781
Event: SPIE Smart Structures and Materials + Nondestructive Evaluation and Health Monitoring, 2014, San Diego, California, United States

Abstract

Asphalt concrete mixtures with different levels of oxidative aging, prepared by oven-aging the mixture at 135 °C for different amounts of time, were used to study the effects of oxidative aging upon the ultrasonic phase velocities and attenuation measurements. It was a observed that both the dilatational and shear velocities increase up to approximately 24 hours of aging after which they significantly decease with aging. Also, both the dilatational and shear attenuation decrease up to around 24 hours of aging, after which both attenuations strongly increase. These results are consistent with results obtained using the mechanical Disk-shaped Compact Tension (DC[T]) fracture tests. Based upon these velocity and attenuation measurements, the dynamic moduli were calculated. It was observed that the dynamic moduli increase from 0 hours to 24 hours and decrease from 24 to 36 hours of oven-aging. The modulus obtained using ultrasonic measurements is also compared with the modulus obtained using the AASHTO recommended mechanical testing. The differences are due to scattering effects, which are present in ultrasonic testing. It was also observed that to avoid the uncertainty associated with assuming a suitable value for the Poisson’s ratio, both the dilatational and shear velocities and corresponding attenuation measurements must be carried out. Furthermore, to eliminate the need for traditional mechanical testing during estimation of complex moduli, frequency-dependent ultrasonic measurements must also be carried out.

Citation Download Citation

Megan McGovern, Behzad Behnia, Brian Hill, William G. Buttlar, and Henrique Reis "Characterization of oxidative aging in asphalt concrete pavements using its complex moduli", Proc. SPIE 9064, Health Monitoring of Structural and Biological Systems 2014, 90641Q (9 March 2014); https://doi.org/10.1117/12.2044781

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KEYWORDS

Signal attenuation

Ultrasonics

Velocity measurements

Scattering

Wave propagation

Phase velocity

Minerals

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