Tensile Behavior of Subbase Materials Under Repetitive Loading

Details

• Creators:
  Moore, Raymond K. ; Kennedy, Thomas W.
• Corporate Creators:
  University of Texas at Austin. Center for Highway Research
• Corporate Contributors:
  Texas Highway Department ; United States. Department of Transportation. Federal Highway Administration
• Subject/TRT Terms:
  Fatigue (Mechanics) Fatigue Tests Load Tests Stabilized Materials Structural Design Subbase Materials Tension Testing
• Publication/ Report Number:
  98-12
• Resource Type:
  Tech Report
• Geographical Coverage:
  Texas ; United States
• Corporate Publisher:
  University of Texas at Austin. Center for Highway Research
• Abstract:
  Results of a study of the fatigue characteristics of asphalt-treated, cement-treated, and lime-treated subbase materials indicated that the indirect tensile test can be used satisfactorily to evaluate the fatigue properties of treated materials under repeated tensile stresses. In addition, the general nature of the relationship between applied tensile stress and fatigue life was determined along with the inherent variation associated with fatigue life of asphalt-treated materials. For the asphalt-treated materials, the relationships between tensile stress and log fatigue life were essentially linear, with failures occurring at tensile stresses ranging from 8 to 40 psi, which were approximately 6 to 30 percent of the static indirect tensile strength. Significant variation in fatigue life occurred, and it was found that the standard deviation varied linearly with the mean fatigue life, with the coefficient of variation ranging from 30 percent to more than 75 percent. Results concerning the fatigue life relationship for the cement-treated and lime-treated materials suggest that there is a critical stress level above which the fatigue life is very short and below which the fatigue life is very long. The tensile fatigue characteristics of asphalt-treated materials were found to be affected by type of asphalt cement, asphalt content, compaction temperature, and mixing temperature. Within the range tested, it was found that fatigue life was increased by using a more viscous asphalt cement, higher compaction temperature, and higher mixing temperature. It was also concluded that there is an optimum asphalt content for maximum fatigue life. In addition, a simple predictive equation was developed which adequately described. the fatigue life of the specimens tested. The fatigue life of the asphalt-treated materials was found to correlate with initial stiffness, initial tensile strain, and the ratio between tensile stress and strength, but these correlations were associated with a large amount of variation. No correlation was found between fatigue life and percent of air voids.
• Format:
  PDF
• Funding:
  3-8-66-98
• Collection(s):
  US Transportation Collection
• Main Document Checksum:
  urn:sha-512:33cfb478d9f6c0573b8dbbd88ac83068dfdfd707391ad424cb766c6ccfdf4d94acdf329a9674f6aebe8c13681075a79a6352542968d6e4a84bde0ed6ce0b86d2
• Download URL:
  https://rosap.ntl.bts.gov/view/dot/85498/dot_85498_DS1.pdf
• File Type:
  [PDF - 2.61 MB ]