ESTIMATION OF RISK OF DEFORMATION WHEN ASPHALT PAVEMENTS ARE LAID WITH NEW WEARING COURSE. PILOT STUDY

BEDOEMNING AV DEFORMATIONSRISKER NAER ASFALTBELAEGGNINGAR FOERSES MED NYA SLITLAGER. EN PILOTSTUDIE MED MATERIAL FRAAN VAESTERAAS

The aim was to estimate the risk of deformation when city streets are laid with new wearing course. The method used was an investigation of a number of beams sawn out from five different pavements. In the laboratory the beams were furnished with new wearing courses. After that the beams were loaded in laboratory tests, and the permanent deformation was localized and measured. It appeared that all the beams were deformed though to a different extent. Intermediate layers such as for instance the previous wearing course and occasionally the latest performed layer were in general most affected. The important question whether and when rutting would arise in practice in the different structures tested can at present not be answered. However, many things indicate that the risks of getting future deformation are reflected by the magnitude of the permanent deformations obtained in the laboratory tests. The same thing can be said about the risks of getting fatigue cracks in the lower edge of the respective layers. Crack formation was most apparent in the thinner structures and did not occur in the thickest. (TRRL)

• Corporate Authors:

  Swedish National Road and Transport Research Institute (VTI)

  Linköping,   Sweden  SE-581 95
• Authors:
  • Bjoerklund, A
• Publication Date: 1981

Language

• Swedish

Media Info

• Features: Photos;
• Pagination: 24 p.

Subject/Index Terms

• TRT Terms: Asphalt pavements; Bearing capacity; Cracking; Deformation; Fatigue (Mechanics); Flexible pavements; Load tests; Maintenance; Pavement cracking; Ruts (Pavements); Tests; Thickness; Wearing course (Pavements)
• Uncontrolled Terms: Rut
• ITRD Terms: 3085: Bearing capacity; 5211: Cracking; 5595: Deformation; 2944: Flexible pavement; 3847: Maintenance; 3081: Rutting (wheel); 6255: Test; 5933: Thickness; 2980: Wearing course
• Subject Areas: Design; Highways; Maintenance and Preservation; Pavements; I22: Design of Pavements, Railways and Guideways; I23: Properties of Road Surfaces;

Filing Info

• Accession Number: 00348145
• Record Type: Publication
• Source Agency: Swedish National Road and Transport Research Institute (VTI)
• Report/Paper Numbers: No. 257 Monograph
• Files: ITRD, TRIS
• Created Date: Mar 30 1982 12:00AM