This paper presents a procedure for calculating rut depths in flexible pavements, based on models developed from laboratory experiments that simulate field conditions. The stud found that the simulation of field conditions in dynamic triaxial tests is a reliable means for measuring the permanent deformation characteristics of both asphalt-bound and unbound granular base materials under a variety of conditions. A statistically based experimental program that used these testing procedures provided the basis for the development of rut depth prediction models. These models were verified by comparison with actual field measurements. Layer equivalencies can also be used in the models to convert sections to either equivalent full-depth or equivalent granular base. From these results, a simple regression equation was developed that predicts rut depths at the test roads with good agreement. The models have been used to evaluate the effects of a wide range of equivalent full-depth thicknesses and in full-depth layer moduli. The results suggest that, for given levels of traffic, there may be an optimum thickness, but a wide range of the modulus has little effect on the rut depth. The simple regression equation can be incorportated into design procedures to analyze rut depths of possible alternatives.

Media Info

  • Media Type: Print
  • Features: Figures; References;
  • Pagination: pp 38-40
  • Monograph Title: Soil mechanics: rutting in asphalt pavements, embankments on varved clays and foundations
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00162995
  • Record Type: Publication
  • ISBN: 0309025958
  • Files: TRIS, TRB
  • Created Date: Oct 13 1977 12:00AM