This report contains the results of the work carried out by the working Committee B9; Asphalt Surfacings with Modified Texture. Most of the research done by the working committee was concentrated on actual test sections of highways in the Netherlands. Three types of asphalt mixes were studied under traffic, namely hot rolled asphalt with precoated chippings (according to the English procedure), the so called open asphalt, normally used as a binder course and thirdly the most promising new development, porous asphalt having approximately 20% voids. The working committee came to the following conclusions and recommendations: (1) the dressing of fine dense asphalt with precoated chippings of 12-15 mm can produce good results only with very careful workmanship under favourable conditions. (2) porous asphalt (high pervious open-textured asphalt) can be used for reducing the thickness of the film of water on the road surface and for achieving good skidding resistance at high speeds. The low-speed skidding resistance of this material would have to be further improved. (3) as a provisional measure, short-term improvement of the surface properties of bituminous mixes can be achieved by the use of open-textured asphalt. This was already common practice with the Rijkswaterstaat, because construction in stages was applied. (4) in course of time it may be possible to develop a mix composition that can be applied directly to the roadbase & can be characterized as "coarse asphalt". The open-textured asphalt with a composition conforming to the 1972 specifications for road-building materials can already perform such a function, though its service life is often less than that of dense coarse-graded asphalt (5 to 10 years). (5) more research into the applicability of plant mix seals under Netherlands conditions will have to be carried out. /TRRL/

  • Availability:
  • Corporate Authors:

    Stitching Studiecentrum Wegenbouw

    Jansbuitensingel 14 A
    Arnhem,   Netherlands 
  • Publication Date: 0


  • Dutch

Media Info

Subject/Index Terms

Filing Info

  • Accession Number: 00174056
  • Record Type: Publication
  • Source Agency: Transport and Road Research Laboratory (TRRL)
  • Report/Paper Numbers: Monograph
  • Files: ITRD, TRIS
  • Created Date: Jun 28 1978 12:00AM