A PREDICTIVE METHOD FOR PERMANENT DEFORMATION IN BITUMEN- EMULSION TREATED SAND

This paper presents a method for predicting the permanent deformation of a bitumen- emulsion treated sand layer as a basecourse in a flexible pavement. Permanent deformation characteristics of the treated sand are determined from repeated load triaxial tests carried out under different levels of repeated deviator stress. Based on the laboratory results a simple hyperbolic expression that relates vertical permanent strains to applied deviator stress was arrived at. The contribution of the bitumen- emulsion basecourse layer to the permanent deformation at the surface is evaluated by integrating the vertical permanent strain (a laboratory- derived expression) with depth, and assuming that pavements can be represented as layered elastic systems. A computer program, based on elastic multi-layer theory, was utilised to determine elastic stresses in a pavement system under a specific wheel load. The utility of this method as a 'design tool' is illustrated in terms of the analysis of significant variables expected to affect rutting of the treated base such as surface layer stiffness and thickness, subgrade stiffness, and the number and magnitude of load applications (A). (TRRL)

Media Info

  • Features: Figures; References; Tables;
  • Pagination: p. 3-11
  • Serial:

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Filing Info

  • Accession Number: 00330302
  • Record Type: Publication
  • Source Agency: ARRB Group Ltd.
  • Files: ITRD, TRIS, ATRI
  • Created Date: May 21 1981 12:00AM