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An optical strain measurement system for asphalt mixtures

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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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Authors and Affiliations

  1. Division of Highway Engineering, The Royal Institute of Technology, Stockholm, Sweden

    Bjorn Birgisson

  2. Department of Civil & Environmental Engineering & Architecture, University of Parma, Parma, Italy

    Antonio Montepara, Elena Romeo, Riccardo Roncella & Gabriele Tebaldi

  3. Department of Civil & Coastal Engineering, University of Florida, Gainesville, FL, USA

    Elena Romeo & Reynaldo Roque

Authors
  1. Bjorn Birgisson
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  2. Antonio Montepara
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  3. Elena Romeo
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  4. Riccardo Roncella
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  5. Reynaldo Roque
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  6. Gabriele Tebaldi
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Corresponding author

Correspondence to Elena Romeo.

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Birgisson, B., Montepara, A., Romeo, E. et al. An optical strain measurement system for asphalt mixtures. Mater Struct 42, 427–441 (2009). https://doi.org/10.1617/s11527-008-9392-8

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  • DOI: https://doi.org/10.1617/s11527-008-9392-8

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