Open-graded friction courses experience and improved mix design

This paper presents a summary of the evaluation of the permeability and durability performance of conventional, rubberized and polymer-modified open-graded asphalt concrete mixes, and an overview of an improved mix design procedure. The results are taken from six years of field evaluation of mixes with 9.5 and 12.5 mm maximum aggregate size gradations, and the accelerated pavement testing (APT) evaluation of 9.5 and 4.75 mm maximum size gradation mixes. Raveling was monitored in terms of mean profile depth in the field. Permeability was measured in both the field and on the APT track in the initial condition and after trafficking. The mix design procedure is an improvement of the NCAT method incorporating both volumetrics and performance related tests for draindown and mechanical durability and was calibrated using conventional, polymer modified and rubberized mixes. The paper provides a summary of all field and APT results, the mix design procedure, and recommendations for practice.


  • English

Media Info

  • Pagination: 12p
  • 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: 01597146
  • Record Type: Publication
  • Source Agency: ARRB
  • Files: ATRI
  • Created Date: Apr 22 2016 11:17AM