Double-Edge-Notched tension testing of South African asphalt binders to control fatigue cracking distress

This paper documents and discusses the fatigue performance grading of asphalt binders from various South African sources with different modification types (waxes, styrene-butadiene (SB) and ethylene vinyl acetate (EVA) type polymers, hybrids). Dynamic shear rheometer (DSR) analysis was used to determine loss moduli in the linear viscoelastic regime. Fatigue lives (Nf) in the linear amplitude sweep (LAS) test were determined to characterize the materials for their damage tolerance at strains of 3 and 6 percent in between parallel plates. Double-edge-notched tension (DENT) tests were conducted in order to obtain approximate critical crack tip opening displacements (CTOD), providing a measure of the critical strain tolerance in the ductile state for a very thin fiber of asphalt binder under high constraint. It was found that the various properties, as currently proposed for fatigue grading, can lead to widely different and sometimes opposite rankings for performance. Hence, it is important to validate specification test methods with well-controlled field trials.

Language

  • English

Media Info

  • Pagination: 7p
  • Monograph Title: 11th Conference on Asphalt Pavements for Southern Africa: CAPSA15, 16-19 August 2015, Sun City, South Africa

Subject/Index Terms

Filing Info

  • Accession Number: 01597073
  • Record Type: Publication
  • Source Agency: ARRB
  • Files: ATRI
  • Created Date: Apr 22 2016 11:12AM