Balanced mix design report for Lufkin’s crack attenuating mix (CAM).

Details

• Creators:
  Scullion, Tom
• Corporate Creators:
  Texas Transportation Institute
• Corporate Contributors:
  Texas. Dept. of Transportation ; United States. Federal Highway Administration
• Subject/TRT Terms:
  Concrete Pavements Cracking Of Concrete Pavements Pavement Joints Pavements, Concrete--Cracking--Texas Pavements, Concrete--Texas--Joints--Maintenance And Repair
• Publication/ Report Number:
  FHWA/TX-10/5-5598-01-1 ; 5-5598-01-1
• Resource Type:
  Tech Report
• Geographical Coverage:
  Texas
• Edition:
  Technical report; Sept. 2008-Aug. 2009.
• Corporate Publisher:
  Texas Transportation Institute
• Abstract:
  Crack Attenuating Mix (CAM) designs are made according to the volumetric procedure defined in Special
  
  Specification 3109 (now 3165) where the optimal asphalt content (OAC) is computed as that which achieves
  
  98 percent of the maximum density at 50 gyrations of Superpave Gyratory Compactor. Samples at the
  
  proposed OAC are then molded to 93 percent density and then subjected to performance testing in the
  
  Hamburg Wheel tracker and Overlay tester. A design was performed for the CAM mix to be placed on BUS
  
  59 in Lufkin and using the specified procedure an optimum asphalt content of 8.3 percent PG76-22 was
  
  determined. This material was placed in the summer of 2008.
  
  In this study an alternative mix design procedure was evaluated. In the balanced mix design procedure the
  
  performance tests are first run at several different asphalt contents, and an acceptable range of asphalt contents
  
  is identified where both the rutting and cracking criteria are met. An optimum asphalt content is then defined
  
  within the acceptable range, and volumetric checks are then made as the final step. Using this procedure the
  
  acceptable range of asphalt contents was defined to be between 7.0 and 8.0 percent (the upper limit tested in
  
  the balance mix design procedure). An optimum of 7.5 percent PG76-22 was proposed with the balanced mix
  
  design approach, substantially lower than that found with the current volumetric procedure. No acceptable
  
  design could be achieved with a PG70-22 binder.
  
  
• Format:
  PDF
• Collection(s):
  US Transportation Collection
• Main Document Checksum:
  urn:sha256:70acf1390e0b4ba5303eebabc9f0c426eb2c569aad9432ad82299b2eba4ce17a
• Download URL:
  https://rosap.ntl.bts.gov/view/dot/18039/dot_18039_DS1.pdf
• File Type:
  [PDF - 71.88 KB ]