Effectiveness of anti-strip agents in asphalt mixtures.

Details

• Creators:
  Watson, Donald ; Moore, Jason R. ; Taylor, Adam J.
• Corporate Creators:
  Georgia Tech Research Institute ; Georgia Institute of Technology. School of Civil and Environmental Engineering
• Corporate Contributors:
  United States. Federal Highway Administration
• Subject/TRT Terms:
  Antistrip Additives Asphalt Mixtures Calcium Hydroxide Evaluation Field Tests Granite Hot Mix Paving Mixtures Laboratory Tests Moisture Damage Pavement Performance Stripping (Pavements) Superpave

  More +
• Publication/ Report Number:
  FHWA-GA-12-0623
• Resource Type:
  Tech Report
• Geographical Coverage:
  Georgia
• Corporate Publisher:
  Georgia. Department of Transportation. Office of Research
• Abstract:
  Since the late 1970s there has been much research performed to better understand the stripping phenomenon in asphalt mixtures.
  
  As a result, there have been changes in both materials and technology over the past 30 years to improve the resistance to moisture
  
  damage and the ability to test for performance under adverse moisture conditions. Due to the changes in materials and technologies
  
  related to the development and improvement of anti-strip agents, this research study was conducted to evaluate the effectiveness of
  
  current anti-strip agents used in hot mix asphalt pavements.
  
  One purpose of the project was to evaluate anti-strip agents with a variety of aggregates and mix types. Three granite sources
  
  were used: one does not have a history of stripping, one is a known stripping aggregate, and the other has used both hydrated lime
  
  and liquid additive in the past in order to meet tensile strength requirements. All granite sources were used in both 12.5 mm surface
  
  mixture and 25 mm base mixture. In addition, a limestone source was used in the 25 mm analysis to determine whether liquid
  
  antistrips may result in better performance than hydrated lime. Limestone was used only in the 25 mm mix because it is not
  
  typically used in surface mixtures due to a tendency to polish under traffic.
  
  Secondly, the past field performance of Georgia’s mixes designed with hydrated lime to the performance of Georgia’s mixes
  
  designed using liquid anti-strip agents was evaluated. Therefore, part of the study involved identifying projects with similar age,
  
  aggregate source, and mix type in order to make comparisons of performance for mixtures with liquid anti-strip with similar
  
  projects that used hydrated lime.
  
  Thirdly, a field test section was constructed where three different anti-strip agents were used in a conventional Superpave
  
  surface mixture. This was done on a typical mill and inlay project.
  
  A final objective involved conducting a series of laboratory performance test comparisons using different aging periods to make
  
  long-term comparisons of the effectiveness of hydrated lime to liquid and Warm mix anti-strip additives.
  
  
• Format:
  PDF
• Funding:
  SPR00-0008-00-484
• Collection(s):
  US Transportation Collection
• Main Document Checksum:
  urn:sha256:c853183e45c800468ff2d3112f49de4378b9ded555a9dc532316540187bc5a0d
• Download URL:
  https://rosap.ntl.bts.gov/view/dot/28674/dot_28674_DS1.pdf
• File Type:
  [PDF - 2.73 MB ]