Evaluation of the low temperature fracture resistance of asphalt mixtures using the semi circular bend test

Research output: Chapter in Book/Report/Conference proceedingConference contribution

110 Scopus citations

Abstract

The use of a Semi Circular Bend test as a candidate for a low-temperature cracking specification was studied. Three similar Superpave mixtures with different asphalt binders (PG 58-40, PG 58-34, and PG 58-28) used in the MnRoad pavement facility were tested at -30°C and -40°C and fracture properties were obtained. For the stiffness calculated as the slope of the load-displacement curve neither the binder type nor the specimen location were significant. For the fracture toughness and in particular for the fracture energy, the binder type effect was significant. At -30°C, the fracture energy ranked the mixture in the same order as their binder PG: the highest was determined for the PG 58-40 and the lowest for the PG 58-28. However, the fracture toughness indicated that the PG 58-34 mixture was about the same as the PG 58-40 mixture. At -40°C, both parameters ranked the mixture in the same order as their binder PG. The toughness evolution with temperatures showed that as the temperature dropped from -30° to -40°C, the toughness for mixture 58-40 increased while for mixtures 58-28 and 58-34 decreased. The fracture energy evolution with temperatures showed that the fracture energy drops as the temperature decreases. The trend observed in both the fracture toughness and fracture energy data suggested that below the binder PG lower limiting temperature very little change in fracture resistance occurs which is in agreement with the asymptotic behavior observed in the rheological characterization of asphalt binders. This is an abstract of a paper presented at the Association of Asphalt Paving Technologists 2004 Technology Sessions (Baton Rouge, LA 3/10-18/2004).

Original languageEnglish (US)
Title of host publicationAsphalt Paving Technology: Association of Asphalt Paving Technologists-Proceedings of the Technical Sessions
Pages401-426
Number of pages26
Volume73
StatePublished - 2004
EventAssociation of Asphalt Paving Technologists - Proceedings of the Technology Sessions, AAPT 2004 - Baton Rouge, LA, United States
Duration: Mar 8 2004Mar 10 2004

Other

OtherAssociation of Asphalt Paving Technologists - Proceedings of the Technology Sessions, AAPT 2004
Country/TerritoryUnited States
CityBaton Rouge, LA
Period3/8/043/10/04

Keywords

  • Acoustic emission
  • Asphalt mixtures
  • Fictitious crack model
  • Fracture energy
  • Fracture toughness
  • Low temperature cracking

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