0-6742 : evaluation of design and construction issues of thin HMA overlays.

Details

• Creators:
  Wilson, Bryan ; Walubita, Lubinda ; Sebesta, Stephen ; Faruk, Abu
• Corporate Creators:
  Texas A&M Transportation Institute
• Corporate Contributors:
  United States. Federal Highway Administration
• Subject/TRT Terms:
  • Hot mix paving mixtures
  • Overlays (Pavements)
  • Pavement design
  • Aggregate mixtures
  • Bond strength (Materials)
  • Skid resistance
  • Compaction
  • Laboratory tests
• Publication/ Report Number:
  0-6742
• Resource Type:
  Brief
• Geographical Coverage:
  Texas
• Corporate Publisher:
  Texas. Dept. of Transportation. Research and Technology Implementation Office
• Abstract:
  Thin hot-mix asphalt (HMA) overlays, placed ; between 1.25 to 0.5 inches, have quickly become ; a go-to maintenance treatment in Texas. While ; implementation around the state is proving ; successful, a few issues needed to be addressed: ; 1. The unavailability of surface aggregate ; class (SAC) A aggregate is pressuring ; districts to blend in lower-quality SAC B ; materials. The question: How much and ; which types of SAC B aggregate should be ; allowed in blending to still have ; acceptable skid resistance? ; 2. Because these mixes are so thin, they are ; subject to higher stresses than traditional ; overlays, especially if the bond is poor. ; The question: How do we test bond ; strength, and what are the best materials ; and methods to achieve a good bond? ; 3. Achieving adequate compaction is a ; critical step to ensure long-term overlay ; performance. Measuring density on thin ; overlays, however, is not possible with ; traditional methods. The question: What ; test methods will best monitor thin lift ; density?
  More +
• Format:
  PDF
• Download URL:
  https://rosap.ntl.bts.gov/view/dot/28773/dot_28773_DS1.pdf
• File Type:
  [PDF - 444.87 KB]
• Collection(s):
  US Transportation Collection
• Main Document Checksum:
  urn:sha256:1eff32ab01998b585c87b55c02e695a86147e1f6ada5f5677afffb364c2a7665