Comparison of skid resistance performance between greywackes and melter slag aggregates in New Zealand

This paper discusses and compares the skid resistance performance of three natural greywacke aggregates and an artificial melter slag aggregate used in New Zealand as road surfacing chip. The comparison includes surface friction test results of the accelerated polishing of laboratory prepared samples and the coefficient of friction as measured by the dynamic friction tester. Furthermore the paper shows what occurs to the microtexture of the aggregate surface by the use of scanning electron microscope (SEM) photographs and how the performance in terms of 'polishing' and measured skid resistance relates to the aggregate mineralogy, grain size and, in the case of greywackes, to their degree of lithification and diagenesis. The paper concludes that the polished stone value (PSV) test cannot be reliably used as a predictor of an aggregates performance. However, the newly developed accelerated polishing method and subsequent surface friction testing developed at the University of Auckland, when combined with an understanding of the aggregates microscopic properties and the geological forming processes of the aggregate, can explain long term skid resistance performance.

Language

  • English

Media Info

  • Pagination: 15p
  • Monograph Title: International Safer Roads Conference: managing roads and runway surfaces to improve safety, Cheltenham, United Kingdom, 11-14 May 2008

Subject/Index Terms

Filing Info

  • Accession Number: 01385498
  • Record Type: Publication
  • Source Agency: ARRB
  • Files: ATRI
  • Created Date: Aug 22 2012 6:57PM