Laboratory evaluation of friction loss and compactability of asphalt mixtures.

Details

• Creators:
  Kassem, Emad ; Masad, Eyad ; Awed, Ahmed ; Little, Dallas
• Corporate Creators:
  Texas Transportation Institute
• Corporate Contributors:
  United States. Department of Transportation. University Transportation Centers (UTC) Program
• Subject/TRT Terms:
  • Asphalt mixtures
  • Friction losses
  • Compaction
  • Skid resistance
  • Angularity
  • Aggregate gradation
  • Binder content
  • Polishing (Aggregates)
  • Laboratory tests
  • Asphalt pavements Pavements, Asphalt--Skid resistance
  More +
• Publication/ Report Number:
  SWUTC/12/476660-00025-1
• Resource Type:
  Tech Report
• Geographical Coverage:
  United States
• Corporate Publisher:
  Southwest Region University Transportation Center (U.S.)
• Abstract:
  This study aimed to develop prediction models for friction loss and laboratory compaction of asphalt ; mixtures. In addition, the study evaluated the effect of compaction level and compaction method of skid ; resistance and the internal structure of asphalt mixtures. The predictive model for friction loss was developed ; based on parameters that describe aggregate texture and angularity before and after polishing, aggregate ; gradation, and polishing cycles in the laboratory. Squared-shape slabs of asphalt mixtures were prepared in ; the laboratory using a linear kneading compactor and polished using a wheel-polishing device. The frictional ; characteristics were measured after different intervals of polishing cycles. Mixtures with coarser aggregate ; gradation were found to have better skid resistance than those with fine aggregate gradation. The friction loss ; model was found to correlate very well with the experimental measurements. ; The predictive model for laboratory compaction of asphalt mixtures was developed based on ; parameters that describe aggregate shape characteristics, aggregate gradation, binder content, and binder ; properties at compaction temperatures. The researchers executed intensive laboratory experiments to ; quantify the effect of these parameters on the compaction of asphalt mixture in the laboratory. Two models ; that describe slope and intercept of the laboratory compaction curves of asphalt mixtures were developed. ; These models showed strong correlations between the predicted values and the measured ones. These models ; provide essential inputs to quantify the compaction effort needed to compact asphalt mixtures. ; In the last phase of this study, the researchers evaluated the effect of compaction level and ; compaction method on skid resistance and internal structure of asphalt pavements. The vibratory roller was ; found to yield a smoother surface than the static roller. In addition, the results confirmed that the vibratory ; roller was more effective in reducing the air voids than the static roller. Moreover, the test sections ; compacted using the vibratory roller had more uniform air void distribution compared to the test sections ; compacted using the static roller.
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• Format:
  PDF
• Funding:
  DTRT07-G-0006
• Download URL:
  https://rosap.ntl.bts.gov/view/dot/25786/dot_25786_DS1.pdf
• File Type:
  [PDF - 6.85 MB]
• Collection(s):
  University Transportation Centers ; US Transportation Collection
• Main Document Checksum:
  urn:sha-512:f7f5f18956da02f62159f8509ef78c54159f71c0bd70c5719b18711b32e21b5aedf9749aed4d4b3e458644ccd548ec95ea333353260251bc1a7e7f855467de85