DIC Technique to Investigate Crack Propagation in Grid-Reinforced Asphalt Specimens
Publication: Journal of Materials in Civil Engineering
Volume 29, Issue 6
Abstract
Crack growth data are among the key parameters needed to characterize the materials used in asphalt concrete fatigue and fracture tests. The purpose of this study is to investigate the use of the digital image correlation (DIC) technique in monitoring the progression of damage and quantifying the length of cracks in asphalt concrete fatigue and fracture tests. To this end, cyclic interlayer shear tests and four-point bending notched beam fatigue tests were performed on double-layer fiberglass grid-reinforced asphalt concrete specimens. The tests were performed at 20°C and at frequencies of 5 and 10 Hz for the cyclic shear and bending beam fatigue tests, respectively. The full-field displacement and strain contours derived from DIC analysis of the specimens’ surface images proved to be powerful tools for monitoring the damage progression in the asphalt specimens under fatigue loading and for developing crack tip detection methods. Crack length measurement methods were developed based on DIC analysis displacement and strain results and were used successfully to determine interfacial crack lengths in the shear tests and vertical and interfacial crack lengths in the four-point bending notched beam fatigue tests.
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Acknowledgments
The authors gratefully acknowledge the research support provided by Saint-Gobain ADFORS.
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Published In
Journal of Materials in Civil Engineering
Volume 29 • Issue 6 • June 2017
Copyright
©2017 American Society of Civil Engineers.
History
Received: May 15, 2016
Accepted: Sep 28, 2016
Published online: Jan 30, 2017
Published in print: Jun 1, 2017
Discussion open until: Jun 30, 2017
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