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Edition:Final Report
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Abstract:Seventy individual surface treatment projects throughout the state of South Dakota were surveyed to determine the current condition and extent of problems with surface treatments in South Dakota. These projects were one to two years old, and included 7 contractors, 11 aggregate sources, 5 asphalt sources, and covered a wide range of ADT. The following eight distresses were noted: loss of aggregate, streaking, flushing, rutting, fatigue cracking, longitudinal cracking, edge cracking, and transverse cracking. Asphalt surface treatment design concepts were reviewed. Several currently implemented design procedures were described and contrasted with South Dakota's current design procedure. The Pennsylvania DOT's graphical design procedure was recommended for adoption. The field survey data were analyzed to determine performance correlations. Asphalt application rate and aggregate gradation properties were the most important variables influencing performance. It was recommended that more care be given to monitoring these variables in the field.
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