An optical strain measurement system for asphalt mixtures
2009 (English)In: Materials and Structures, ISSN 1359-5997, E-ISSN 1871-6873, Vol. 42, no 4, 427-441 p.Article in journal (Refereed) Published
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.
Place, publisher, year, edition, pages
2009. Vol. 42, no 4, 427-441 p.
Digital image correlation, Hot mix asphalt, Least square matching, Fracture mechanics, digital-image-correlation, crack-growth, deformation, mechanics
IdentifiersURN: urn:nbn:se:kth:diva-18350DOI: 10.1617/s11527-008-9392-8ISI: 000265247600002ScopusID: 2-s2.0-65049085657OAI: oai:DiVA.org:kth-18350DiVA: diva2:336396
QC 201005252010-08-052010-08-052010-12-14Bibliographically approved