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Proceedings Paper

Damage and healing evaluation of Mn/Road pavements using stress wave testing
Author(s): Evan Katzke; Y. Richard Kim
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Paper Abstract

In order to accurately assess the fatigue life of asphalt concrete pavements, an in-situ field evaluation method must be used so that factors which cannot be accounted for in the lab are considered. Surface wave testing is employed in this research to nondestructively monitor sensitive structural changes in the asphalt surface layer of pavements in the field. Microcrack damage growth and healing are investigated on pavement test sections at the Minnesota Road Research Facility (Mn/Road) by way of surface wave testing. One of the mechanisms which cannot be simulated accurately in the lab is healing of asphalt concrete during rest periods. Healing of the asphalt pavement test sections at Mn/Road following a 24 hour rest period was quantified using wavespeed measurements. These measurements show that a significant amount of healing is occurring and can be detected using stress wave testing. Several signal processing methods are used to evaluate the microcrack damage growth and healing in the asphalt pavement sections. The 'apparent' modulus is computed from the velocity of wave propagation and used to quantify damage in the pavements. Attenuation of the stress waves is also calculated for damage assessment. It is discovered that attenuation parameters in the frequency domain are more sensitive than wavespeed calculations in the time domain, but contain significantly more variability.

Paper Details

Date Published: 31 March 1998
PDF: 11 pages
Proc. SPIE 3400, Structural Materials Technology III: An NDT Conference, (31 March 1998); doi: 10.1117/12.300107
Show Author Affiliations
Evan Katzke, North Carolina State Univ. (United States)
Y. Richard Kim, North Carolina State Univ. (United States)

Published in SPIE Proceedings Vol. 3400:
Structural Materials Technology III: An NDT Conference
Ronald D. Medlock; David C. Laffrey, Editor(s)

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