Asphalt mixture performance characterization using small-scale cylindrical specimens.

Details

• Creators:
  Diefenderfer, Brian K. ; Bowers, Benjamin F. ; Diefenderfer, Stacey D.
• Corporate Creators:
  Virginia Center for Transportation Innovation and Research
• Corporate Contributors:
  Virginia. Dept. of Transportation
• Subject/TRT Terms:
  • Dynamic modulus of elasticity
  • Asphalt mixtures
  • Performance tests
  • Cylinders (Geometry)
  • Laboratory tests
  • Cores (Specimens)
  • Test procedures
• Publication/ Report Number:
  VCTIR 15-R26
• Resource Type:
  Tech Report
• Geographical Coverage:
  Virginia
• Corporate Publisher:
  Virginia Center for Transportation Innovation and Research
• Abstract:
  The results of dynamic modulus testing have become one of the primarily used performance criteria to evaluate the ; laboratory properties of asphalt mixtures. This test is commonly conducted to characterize asphalt mixtures mechanistically ; using an asphalt mixture performance tester as developed in NCHRP Project 9-29. The typical test specimen geometry consists ; of a cylinder having a 100-mm diameter and a 150-mm height. This geometry is practical for laboratory-prepared specimens ; produced using a gyratory compactor. However, the specimen scale is problematic when the test specimen is prepared from field ; cores and the investigator wishes to isolate the testing to a single asphalt mixture material/layer. This is because most asphalt ; mixture layers, especially surface and intermediate layers, are placed having a thickness less than 150 mm. ; This study investigated the use of small-scale cylindrical specimens as an alternative means to conduct dynamic modulus ; testing of asphalt mixtures. To validate the small-scale approach, the dynamic modulus from small-scale specimens was ; compared to the dynamic modulus from full-size specimens (100 × 150 mm) using asphalt mixtures having a nominal maximum ; aggregate size (NMAS) of 9.5, 12.5, 19.0, and 25.0 mm. Small-scale cylindrical specimens having a diameter and height of 38 × ; 135 mm, 50 × 135 mm, 38 × 110 mm, and 50 × 110 mm were studied. ; Based on the findings of the study, for 9.5- and 12.5-mm NMAS mixtures, any of the four small-scale geometry ; dimensions appears to be a suitable alternative to the full-size specimen when the full-size specimen cannot be produced. For ; 19.0- and 25.0-mm NMAS mixtures, the two small-scale geometries having a diameter of 50 mm appear to be suitable ; alternatives to the full-size specimen when the full-size specimen cannot be produced.
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• Format:
  PDF
• Download URL:
  https://rosap.ntl.bts.gov/view/dot/29084/dot_29084_DS1.pdf
• File Type:
  [PDF - 1.01 MB]
• Collection(s):
  US Transportation Collection
• Main Document Checksum:
  urn:sha256:6f94b1da3417a9e989e290e9c8f511b80e75b55ddf3bf47a432eca0afc104249