Correlation between mean profile depth estimated macro texture depth

The surfaced rural road network in South Africa consists mainly of surface dressings comprising single seals, double seals, sand seals, Cape seals and slurry seals. Macro texture on surfaced roads plays an important role in selecting and prioritizing remedial actions, as part of Pavement Management Systems, as well as for the selection of appropriate seal types and binder application rate design. High speed profilers, used on a regular basis for road network surveillance, provide accurate and repeatable data, which could replace subjective visual evaluation and time consuming manual macro texture measurements such as volumetric sand patch tests. As per ISO 13473 guide, the Mean Profile Depth (MPD) value from laser measurements may be transformed to an Estimated Texture Depth (ETD) by applying the transformation equation of ETD = 0.2 mm + 0.8MPD. However, several measurements executed on different surfacing types, with texture depths varying between 0.5 mm and 5.5 mm, indicated a good correlation between MPD and volumetric texture measurement results, but different to the recommended transformation equation. Due to this controversy, a formal study was launched to obtain data on a wide spectrum of macro texture and surfacing types for comparison. This paper provides some background to the need for macro texture data, discusses the experimental design and outcome of comparative testing and highlights problems and variation using different material i.e. sand and glass beads with different grading.

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: 01597082
  • Record Type: Publication
  • Source Agency: ARRB
  • Files: ATRI
  • Created Date: Apr 22 2016 11:13AM