Innovative surfacing treatments for flexible pavements in New Zealand

The performance to date of some of the innovative treatments designed to correct loss of texture and skid resistance on New Zealand's state highways are described in detail in the paper as follows. Ultra high-pressure watercutting is being used to improve both macrotexture and microtexture of surfacings. Hot mix asphalt does not comply with the macrotexture requirements so it is being grooved to improve drainage characteristic and improve hysteretic friction effects. Modern computer-controlled sprayers have been developed to apply bitumen at rates that vary transversely across the lane width and are being used when chipseal surfaces have insufficient macrotexture in the wheeltracks as well as a preventative measure for binder rise in the future. Polymer modified bitumen and polymer modified emulsions are being used as binders in chipseals to allow very low application rates to be applied to treat surfaces with macrotexture problems and prevent binder rise in the future. Thin and ultra thin textured gap graded hot mixes are being used in high stress high trafficked areas. A range of devices is used to measure skid resistance in New Zealand, and the respective roles and benefits of each of these devices is discussed in the paper.

Language

  • English

Media Info

  • Pagination: 14p

Subject/Index Terms

Filing Info

  • Accession Number: 01389603
  • Record Type: Publication
  • Source Agency: ARRB
  • Files: ITRD, ATRI
  • Created Date: Aug 23 2012 3:36AM