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:
  Asphalt Mixtures Cores (Specimens) Cylinders (Geometry) Dynamic Modulus Of Elasticity Laboratory Tests Performance Tests 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.
  
  
• Format:
  PDF
• Collection(s):
  US Transportation Collection
• Main Document Checksum:
  urn:sha256:6f94b1da3417a9e989e290e9c8f511b80e75b55ddf3bf47a432eca0afc104249
• Download URL:
  https://rosap.ntl.bts.gov/view/dot/29084/dot_29084_DS1.pdf
• File Type:
  [PDF - 1.01 MB ]