Unbound Aggregate Rutting Models for Stress Rotations and Effects of Moving Wheel Loads

The latest research findings on stress rotations caused by moving wheel loads and their effects on permanent deformation or rut accumulation in pavement granular layers are presented. Realistic pavement stresses induced by moving wheel loads were examined in the unbound aggregate base and subbase layers, and the significant effects of rotation of principal stress axes were indicated for a proper characterization of the permanent deformation behavior. To account for the rutting performances of especially thick granular layers, a comprehensive set of repeated load triaxial tests was conducted in the laboratory. Triaxial test data were obtained and analyzed from testing aggregates under various realistic in situ stress paths caused by moving wheel loading. Permanent deformation characterization models were then developed on the basis of the experimental test data to include the static and dynamic stress states and the slope of stress path loading. The models that also considered the stress path slope variations predicted the stress path dependency of permanent deformation accumulation best. In addition, multiple stress path tests conducted to simulate the extension-compression-extension type of rotating stress states under a wheel pass gave much higher permanent strains than those of the compression-only single path tests. The findings indicated actual traffic loading simulated by the multiple path tests could cause greater permanent deformations or rutting damage, especially in the loose base or subbase, when compared with deformations measured from a dynamic plate loading or a constant confining pressure type laboratory test.

• Record URL:
  https://doi.org/10.3141/1913-05
• 
• Summary URL:
  http://scholar.google.com/scholar_lookup?title=Unbound+Aggregate+Rutting+Models+for+Stress+Rotations+and+Effects+of+Moving+Wheel+Loads&author=I.+Kim&author=E.+Tutumluer&publication_year=2005
• Availability:
  • Find a library where document is available. Order URL: http://www.trb.org/Main/Public/Blurbs/156718.aspx
• Authors:
  • Kim, In Tai
  • Tutumluer, Erol
• Publication Date: 2005

Language

• English

Media Info

• Media Type: Print
• Features: Figures; References; Tables;
• Pagination: pp 41-49
• Monograph Title: Geology and Properties of Earth Materials 2005
• Serial:
  • Transportation Research Record: Journal of the Transportation Research Board
  • Issue Number: 1913
  • Publisher: Transportation Research Board
  • ISSN: 0361-1981

Subject/Index Terms

• TRT Terms: Aggregates; Base course (Pavements); Mathematical models; Repeated loads; Rutting; Stresses; Subbase (Pavements); Traffic loads; Triaxial shear tests; Wheel loads
• Uncontrolled Terms: Unbound aggregate base courses
• Subject Areas: Freight Transportation; Geotechnology; Highways; I36: Aggregates;

Filing Info

• Accession Number: 01011077
• Record Type: Publication
• ISBN: 0309093864
• Files: TRIS, TRB, ATRI
• Created Date: Dec 2 2005 3:34PM