An optical strain measurement system for asphalt mixtures |
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Authors: | Bjorn Birgisson Antonio Montepara Elena Romeo Riccardo Roncella Reynaldo Roque Gabriele Tebaldi |
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Affiliation: | (1) Division of Highway Engineering, The Royal Institute of Technology, Stockholm, Sweden;(2) Department of Civil & Environmental Engineering & Architecture, University of Parma, Parma, Italy;(3) Department of Civil & Coastal Engineering, University of Florida, Gainesville, FL, USA |
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Abstract: | Knowledge of the conditions governing the initiation and propagation of cracks in hot mix asphalt (HMA) mixtures is a prerequisite
for a comprehensive understanding of HMA cracking mechanisms. Traditional strain measurement sensors have proved to be not
completely adequate in the sense that they do not provide pointwise measurements, thus not pinpointing the location of crack
initiation, and not accounting for non-uniform strain distributions. This paper presents a digital image correlation (DIC)
system for non-contact and full strain field measurements, conceived for the purpose of investigating the cracking behavior
of HMA mixtures. The whole system was developed so as to account for the special nature of typical HMA testing configurations.
An image matching technique (least squares matching) was employed for providing matches with sub-pixel accuracy. The performance
of the method was investigated by several tests. The DIC system was shown to overcome the shortcomings of traditional on-specimen
strain measurement devices achieving satisfactory accuracy compared to strain gauges. |
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Keywords: | Digital image correlation Hot mix asphalt Least square matching Fracture mechanics |
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