Performance grading of South African asphalt binders for thermal cracking

This paper documents and discusses the low temperature grading of seven asphalt binders from various South African sources with different modification types (waxes, styrene-butadiene (SB) and ethylene vinyl acetate (EVA) type polymers, hybrids) in order to predict thermal cracking performance. Binders were aged using a rolling thin film oven (RTFO) and pressure aging vessel (PAV). Dynamic shear rheometer (DSR) analysis was used to determine limiting phase angle temperatures (T(d=30°)). Bending beam rheometer (BBR) tests were used to determine low temperature grades and tendencies for physical hardening during cold storage. It was found that the regular Superpave™ grades were relatively similar but that additional conditioning in either the PAV and/or the BBR prior to testing resulted in very significant and somewhat unpredictable change. Hence, in addition to measuring material quality, it is of critical importance to include durability assessments in order to limit thermal cracking to a reasonable degree.

Language

  • English

Media Info

  • Pagination: 6p
  • 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: 01597072
  • Record Type: Publication
  • Source Agency: ARRB
  • Files: ATRI
  • Created Date: Apr 22 2016 11:12AM