HEAT DAMAGE TO BITUMINOUS PAVEMENTS. EXPERIENCES OF THE SUMMER OF 1976

HITZESCHAEDEN AN BITUMINOESEN FAHRBAHNBEFESTIGUNGEN. ERFAHRUNGEN DES SOMMERS 1976

The use of studded tyres (until their prohibition) and the heat-wave of 1976 have both, as a result of different actions, produced tracking in bituminous pavements. Heat damage has occurred mainly on roads with channelized traffic and on inclined stretches. During the summer of 1976 the temperature within the surfacing rose to over 50 deg C on 15 days. At the lower edge the temperature remained above 30 deg C for 18 consecutive days. The deformation, for which no standards have been provided, has been traced back to subsequent compaction in all layers, to insufficient stability of the bituminous surface and of the base and to technical faults and deficiencies in the whole structure. Investigations have shown partial deviations from the specifications. The changes in mix design allowed by the specification TV bit 3 of 1972 as a result of previous damage by tyre studs had the effect of increasing the resistance to wear at the expense of stability. It was nevertheless possible to construct within the prescribed limits a durable structure capable of withstanding deformation and one which also resulted in only local heat damage and in tracking which did not extend beyond occasional occurrence. It is recommended that for the future the rate of spread of chippings for the surface and the binder layer should be selected as high as possible, strengthened wearing courses should be constructed with a maximum size aggregate of 16 mm, void limit proportions should be at the upper allowable limits and harder binders should be considered. /TRRL/

Language

  • German

Media Info

  • Features: Figures; Photos; References;
  • Pagination: p. 48-51
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00194093
  • Record Type: Publication
  • Source Agency: Bundesanstalt für Straßenwesen (BASt)
  • Files: ITRD, TRIS
  • Created Date: Jun 13 1979 12:00AM