IMPROVEMENT OF ROAD SURFACE CHARACTERISTICS. ASPHALTIC CONCRETE IN VERY THIN LAYERS AND PERVIOUS BITUMINOUS MIXTURES ---PRE CONFERENCE PROCEEDINGS 3RD IRF MIDDLE EAST REGIONAL MEETING. TOWARDS BETTER ROAD PERFORMANCE, RIYADH, SAUDI ARABIA, 13-18 FEBRUARY 1988. 6 VOLUMES.

AMELIORATION DES CARACTERISTIQUES DES REVETEMENTS. LES BETONS BITUMINEUX EN COUCHES TRES MINCES ET LES ENROBES DRAINANTS

Demand in level of service on motorways led management agencies and technical services to develop and to use contruction and maintenance techniques to produce the required surface characteristics (especially skid resistance), while ensuring the other functions of a surface layer (evenness, rutting resistance, structural maintenance). The principal innovations carried out during recent years concern asphaltic concrete in very thin layers and porous asphaltic coatings. These two techniques are applied to pavements without structural problems with slightly different objectives. Asphaltic concretes in very thin layers are used to restore waterproofing and rugosity to pavements with surface degradations (fine cracks due to asphalt ageing, transverse cracking, slipperiness). These coatings, between surface dressings and 4 cm of asphaltic concrete may comprise pure bitumen or modified binder, according to climatic conditions and traffic. Porous coatings constitute a very efficient solution to improve skid resistance in rainy weather, while reducing, even eliminating water spray, from vehicles, especially trucks. They also have the advantage of reducing the noise compared to other surfaces of the same rugosity. French experience shows on the other hand that risks of ice formation are not more frequent than on other rough textured surfaces. This technique has been used both on links as at single points. This paper presents different operations carried out on motorways using these techniques, with a performance survey for a traffic of between 7000 and 35000 vehicles a day comprising approximately 20% of trucks. For the covering abstract of the proceedings see IRRD 817883.

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  • Accession Number: 00486920
  • Record Type: Publication
  • Source Agency: Transport and Road Research Laboratory (TRRL)
  • Files: ITRD, TRIS
  • Created Date: Sep 30 1989 12:00AM