Fracture and Fatigue of Binder and Binder/Filler Mortar

The introduction of the Direct Tension Test (DTT) into the Superpave specification in the US has opened up the question of binder fracture and its relation to asphalt mixture fatigue. This paper presents an extensive set of test data from the DTT, varying the temperature in the range -10 to +10°C and covering a very wide range of loading rates. A single straight run binder has been used, but tests have also been carried out on a wide range of binder/filler mortars, investigating the effect of filler content. It is found that each filler content is associated with a brittle fracture strength that is almost independent of temperature and loading rate. Time-temperature superposition is then used to produce shift factors, which show clearly the ranges of brittle and ductile behavior and allow prediction of brittle fracture behavior at higher temperatures and faster loading rates. Next the paper presents a series of test data from a uniaxial fatigue equipment, again including tests on both binder and binder/filler mortars. It is seen that the DTT strength relating to brittle fracture corresponds well to the stress necessary to induce failure at a single load application, projected from fatigue data. Discussion and calculations are then presented and conclusions drawn regarding the most appropriate approach to modeling fracture in a binder/filler mortar. For the covering abstarct of this conference see ITRD number E215163.

• Corporate Authors:

  International Society for Asphalt Pavements

  4711 Clark Avenue, Suite G
  White Bear Lake, MN  United States  55110
• Authors:
  • THOM, NH
  • OSMAN, S
  • COLLOP, AC
  • AIREY, GD
• Conference:
  • 10TH INTERNATIONAL CONFERENCE ON ASPHALT PAVEMENTS - AUGUST 12 TO 17, 2006, QUEBEC CITY, CANADA
• Publication Date: 2006

Language

• English

Media Info

• Media Type: Print
• Pagination: p. vol1,798-807
• Monograph Title: 10th International Conference on Asphalt Pavements - August 12 to 17, 2006, Quebec City, Canada

Subject/Index Terms

• TRT Terms: Bitumen; Bituminous mixtures; Conferences; Cracking; Fillers; Laboratories; Mechanical fatigue; Test procedures
• Geographic Terms: Canada
• Subject Areas: Design; Materials; Pavements; I22: Design of Pavements, Railways and Guideways; I31: Bituminous Binders and Materials;

Filing Info

• Accession Number: 01084394
• Record Type: Publication
• Source Agency: Transportation Association of Canada (TAC)
• Files: TAC
• Created Date: Jan 16 2008 7:53AM