In many of the surfacing procedures carried out in recent years, regular shiftings in the pavement surface could be observed which were believed to be due to separations in the asphalt material which was put down. The separated surfaces can be considered to be the cause of increased wear, and consequently they give the finished surface an uneven quality, and that has an effect on how soon maintenance work is required and how long the surface will last. Separation occurs at various stages in the handling of combined pebble and asphalt material. What happens is that the coarser pebbles are separated from the finer material, and as a result the original grain graduation and binding agent content is not present in all parts of the asphalt surface. An investigation of surfacing procedures was conducted which showed that relatively large variations occur in the composition of the asphalt surfaces which are put down. As a rule, a concentration of material with an open composition occurs at the end of a truck load or in the middle of a stretch. The mass of surfacing material showing the least variation in its composition showed the least tendency toward separation in other testings regarded as reliable.

Media Info

  • Pagination: 67 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00343060
  • Record Type: Publication
  • Source Agency: National Technical Information Service
  • Report/Paper Numbers: VTI/MEDDELANDE-160
  • Files: NTIS
  • Created Date: Sep 16 1981 12:00AM