This article describes several products and treatments for road surfaces, that are much thinner than traditional asphalt layers, and are now becoming increasingly popular. They include: (1) thin asphalt layers, sometimes called 'thin' or 'ultra-thin' wearing courses; (2) surface dressings, usually called 'slurry seals' in the USA. Their thicknesses range from 20mm to about 8mm, the minimal practical thinness. This trend is due partly to a change of emphasis from new construction towards maintenance of existing infrastructure, and partly due to some significant advantages in materials technology, that allow thinner pavement layers to perform better. Good new French thin wearing course technologies include Enterprise Jean Lefebvre's UL-M and Screg Routes' Euroduit. A recent study of the surface friction characteristics of two municipal airports in Kansas, USA, indicated some advantages of micro-surfacing and slurry seal wearing courses. Other new products include: (1) Bitumac, a performance surfacing developed by British road surfacing specialist Colas Ltd; 2) Lefebvre's Gripfibre, a cold-applied asphalt concrete with synthetic fibres; (3) Shell Bitumen's Multiphalte.


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  • Accession Number: 00675159
  • Record Type: Publication
  • Source Agency: Transport Research Laboratory
  • Files: ITRD
  • Created Date: Mar 28 1995 12:00AM