Layer Equivalency Factors and Deformation Characteristics of Flexible Pavements

Details

• Creators:
  Hung, J. T. ; Briaud, Jean-Louis ; Lytton, R. L.
• Corporate Creators:
  Texas Transportation Institute. Texas A&M University
• Corporate Contributors:
  Texas State Department of Highways and Public Transportation ; United States. Department of Transportation. Federal Highway Administration
• Subject/TRT Terms:
  Base Course (Pavements) Dynaflect Flexible Pavements Modulus Of Deformation Pavement Layers Pressure Gages Triaxial Shear Tests
• Publication/ Report Number:
  FHWA/TX-82/19+284-3
• Resource Type:
  Tech Report
• Geographical Coverage:
  Texas ; United States
• Edition:
  Interim: September 1979 - October 1981
• Corporate Publisher:
  Texas Transportation Institute. Texas A&M University
• Abstract:
  In this report, a method is developed for determining the equivalent thicknesses for different base courses, which will give the same pavement life expectancy. This study shows how the layer equivalents can be obtained from Texas Triaxial tests or from pavement pressuremeter tests or from Dynaflect tests. The procedures were developed after testing 11 pavement sections having four different types of base courses and subbase courses in the Beaumont District (District 20) in Southeastern Texas. Taking the sand and oyster shell base course as reference (layer equivalent of 1), it was found that the lime treated crushed sandstone had a layer equivalent of 0.68, the iron ore 1.17, and the select sand 1.29. This study permitted moduli of deformation to be obtained from the pressuremeter test, the Texas Triaxial test and the Dynaflect test coupled with the Russian equation. Comparisons between the various moduli are presented. This study used the cyclic pressuremeter test to determine the stress and strain level dependency of soil moduli and permanent deformation characteristics of the layers. This report includes the presentation of a procedure to determine the layer equivalents of base courses on the basis of Texas Triaxial tests. Examples of calculations are included.
• Format:
  PDF
• Funding:
  2-8-80-284
• Collection(s):
  US Transportation Collection
• Main Document Checksum:
  urn:sha-512:c05c7c537391de16c73e47e48ff37135b879aef5dd2e0a84a18aabe4647573ac751aa7409f01fcc6259ff55db9c434edb3604e4d2b30a1b7fee8f9065d939248
• Download URL:
  https://rosap.ntl.bts.gov/view/dot/85740/dot_85740_DS1.pdf
• File Type:
  [PDF - 3.42 MB ]