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Determining Binder Flushing Causes in New York State
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    Final Report
  • Abstract:
    In 2007, a number of asphalt pavements in New York State flushed. An extensive forensic and laboratory investigation was conducted to determine why particular New York State asphalt pavements constructed in 2007 had undergone “atypical” flushing. Analysis of quality control records, laboratory characterization of field cores, and a laboratory mixture evaluation component were conducted to help best determine the potential reasoning for unexpected pavement flushing. At the conclusion of this study, there were no definitive reasons as to why these pavements had flushed. For every task evaluated where a potential reason was identified that may have caused the flushing issue, there were always exceptions that prohibited a conclusive answer. Therefore, although the findings in the study outline how material testing and specification can be improved in New York State to help reduce the potential for rutting/flushing in the future, the exact reasoning for the flushing in 2007 is still unknown.

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