Digital Repository, CP2006

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CRACK MONITORING AND STRAIN MEASUREMENT IN ASPHALT MIXTURE BY DIGITAL IMAGE CORRELATION
E. Romeo, R. Roncella, G. Tebaldi, G. Nicoletto

Last modified: 2013-03-12

Abstract


A full field method for the description of in-plane strain fields is appliedfor improving Asphalt Mixture cracking behaviour insights. A Digital ImageCorrelation (DIC) system based on the Least Square Matching technique is used tocompute strains and depict crack path in the process from microcrack initiation tofailure. A Brazilian test was performed using hole-notched specimens. The testgenerates tensile stresses in a known and limited portion of the specimen simplifyingtest monitoring and image capture for subsequent application of the DIC system. Theresults show the capability of the DIC system to allow a dense description of the fieldall over the cracking process involving the peak and the post-peak softening slope.Compared to traditional strain devices, the system provides a wealth of information, aswell as an easier and faster setting process.

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