THE RESISTANCE TO DEFORMATION OF ASPHALT

ZUR VERFORMUNGSBESTAENDIGKEIT VON ASPHALT

The heat wave during the summer of 1976 caused damage to bituminous pavements and concrete roads. This paper deals only with the defects in bituminous pavements and their prevention. Damage in the form of ruts occurred in areas subject to severe insolation where heavy vehicles were forced to travel slowly because of steep gradients, where horizontal braking forces occur, where goods vehicles were parked or proceeded in convoy and where the composition of the pavement mixture was in the interests of durability taken to the limits for stability laid down in the regulations. To characterize the situation in the summer of 1976 details of the observed temperature are given. The physical basis for the resistance to deformation of bituminous mixtures is explained in detail in relation to their rheological properties. From theoretical considerations and practical experience it is found that the deformation resistance of bituminous mixtures can be increased by altering the consistency of the binder, by the use of catalytically blown bitumens or polymer admixtures, by increasing the filler/bitumen ratio and in the case of the aggregate by the use of angular grain material. In particular the internal friction in the aggregate can be increased by the use of crusher sand and of chippings containing a larger proportion of large grain sizes. /TRRL/

Language

  • German

Media Info

  • Features: Figures; Photos; References;
  • Pagination: p. 41-8
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00194073
  • Record Type: Publication
  • Source Agency: Bundesanstalt für Straßenwesen (BASt)
  • Files: ITRD, TRIS
  • Created Date: Jun 13 1979 12:00AM