EVALUATION OF PERMANENT DEFORMATION IN ASPHALT CONCRETE PAVEMENTS

Results of an evaluation of permanent deformation, or rutting, in asphalt concrete pavements subject to traffic load and environmental conditions are presented. Because previous studies have shown rutting to be a major mode of distress in various pavement systems, rutting criteria should be considered in any rational method of pavement design. For practical applications, it is often necessary to estimate the rutting expected in a pavement for a certain period or set of conditions. To accomplish this, a model of rutting estimation is necessary. An approach to rutting estimation applied successfully to subgrade soils in research at Ohio State University was used to study the variation of rutting parameters with asphalt content, temperature, and loading conditions for two mixtures that met Ohio specifications for surface-course mixtures. The data and results were obtained from uniaxial dynamic tests performed on laboratory-prepared samples and from previous research conducted at Ohio State University. The findings of the study, and comparisons with results of previous similar studies, indicate that a direct general relation exists between rutting parameters, dynamic moduli, and applied stress. The rutting parameter m was found to be almost constant within the range of study, which confirms previous results on subgrade soils that showed m to be an almost universal constant independent of soil type, stress, dynamic modulus, or saturated environmental conditions. A method for estimating permanent deformation in asphaltic concrete layers is proposed on the basis of the relation found in this study, in which the dynamic modulus was found to characterize such mix properties as density, asphalt content, gradation, air voids, and temperature with respect to rutting criteria. A general relation was also found between the rutting parameter A and the dimensionless ratio of dynamic modulus to applied stress. This relation satisfactorily describes the test results regardless of other influential factors such as type of material. (Author)

Media Info

  • Media Type: Print
  • Features: Figures; Photos; References; Tables;
  • Pagination: pp 21-31
  • Monograph Title: Pavement distress, evaluation, and performance
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00302406
  • Record Type: Publication
  • ISBN: 0309029627
  • Files: TRIS, TRB
  • Created Date: Jan 30 1980 12:00AM