Evaluation of Variability in Resilient Modulus Test Results (ASTM D4123)

Details

• Creators:
  Brown, E.R. ; Foo, Key Y.
• Corporate Creators:
  National Center for Asphalt Technology (U.S.)
• Subject/TRT Terms:
  • Asphalt mixtures
  • Laboratory tests
  • Modulus of resilience
  • Stresses
  • Variance
  • Temperature
  • Aggregate size
  • Repeatability
• Resource Type:
  Tech Report
• Geographical Coverage:
  United States
• Corporate Publisher:
  National Center for Asphalt Technology (U.S.)
• Abstract:
  Samples of asphalt mixture were evaluated in the laboratory under various conditions to evaluate the repeatability of the resilient modulus test and to evaluate the effect of stress on the measured resilient modulus. Some of the samples were prepared in the laboratory and others were obtained from in-place pavements that had been subjected to traffic. The independent variables investigated included stress, test temperature, and maximum aggregate size. Tests were repeated a number of times and the data were analyzed by SAS to investigate its repeatability. This study quantified the repeatability of the ASTM D 4123 resilient modulus test as function of stiffness. The repeatability of resilient modulus test (ASTM D 4123) is low. A significant increase in the number of samples or number of measurements is required to improve the repeatability making it unfeasible. Tests conducted at different stresses showed resilient modulus to be stress sensitive. This indicated that stress should be specified in the test procedure. A correction factor was established for stresses differing from the recommended stress (15% of tensile stress) for test temperatures of 25 deg C and 40 deg C.
• Format:
  PDF
• Download URL:
  https://rosap.ntl.bts.gov/view/dot/13626/dot_13626_DS1.pdf
• File Type:
  [PDF - 557.70 KB]
• Collection(s):
  US Transportation Collection
• Main Document Checksum:
  urn:sha-512:133959ec688daa66c9b45a125ae01701185063fa376c45d4d4d6a9e160006513bbb5e90c8bdb6e9c30259d977addc5440afbfe935cbc4fffdac0bdacefc7afe8