UPPVAERMNING AV ASFALTBELAEGGNINGAR MED HJAELP AV STRALNING. EN TEORETISK ANALYS FOER BEDOEMNING AV TEMPERATURFOERDELNINGEN OCH DEN TILLGODOGJORDA VAERMEENERGIN (HEATING OF ASPHALT PAVEMENTS BY USE OF RADIATION. A THEORETICAL ANALYSIS FOR THE ESTIMATION OF THE TEMPERATURE DISTRIBUTION AND THE HEAT ENERGY UTILIZED),

Greater and greater importance is attached to the maintenance of asphalt pavements. Among other things, methods which involve preheating of the existing road surface have been used. In this report, numerical results of a derived method of calculation giving the temperature of an asphalt pavement during and after heat transfer by radiation are presented. Energy conditions are also studied. Programs made for the Hewlett-Packard calculator, HP-97, have been applied. The assumptions which the analysis is based on are, however, idealized. From the results it appears that the surface temperature is comparatively high when the radiation ceases, and that its magnitude is dependent on the length of heating time. However, the surface temperature decreases fast if no insulation of the surface takes place. The penetration of heat into the pavement will then take a comparatively long time. After several periods of heating the results can be superposed. If subsequent cutting, if any, is considered allowed in a pavement layer when the temperature exceeds a certain level, it ought to take place some time after completion of heating. Perhaps, however, cutting can be done earlier. The higher heat energy in the surface layer can then be used in renewed laying and compaction operations instead.

Media Info

  • Pagination: 87 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00328333
  • Record Type: Publication
  • Source Agency: National Technical Information Service
  • Report/Paper Numbers: VTI-191
  • Files: NTIS
  • Created Date: Apr 15 1981 12:00AM