Field evaluation of skid resistant surfaces : final report : part I.
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Field evaluation of skid resistant surfaces : final report : part I.

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  • English

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    • Alternative Title:
      Field evaluation of skid resistant surfaces : Louisiana highway research.
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    • Abstract:
      This project was undertaken to establish a thin bituminous surface course that would possess good skid resistant qualities as well as, being both economical and durable.

      This is the final report on the evaluation of skid resistant surfaces which was conducted by the Louisiana Department of Highways in cooperation with the Bureau of Public Roads.

      The study consisted of constructing eleven duplicate 1000 foot test sections on a roadway that carried approximately 9700 vehicles per day. These test sections included four different types of bituminous mixtures, such as, asphaltic concrete, sand asphalt, plant mix seals and slurry seal. the various aggregate used in these test sections consisted of crushed gravel, slag, expanded clay and granite.

      The evaluation of the test sections was based primarily on the skid resistant qualities of the mixtures with some consideration given to the ease of construction and finished riding surface. Skid resistance was obtained on each of the test sections at approximately four month intervals up to eleven months after completion. At eleven months the final results were obtained on the test sections, which had carried a total of 3,209,346 vehicles. the evaluation included comparisons of skid numbers and roughness results for the various test sections at different time intervals after completion.

      In general, the plant mix seals proved to be the most favorable of the different mixtures. The slag and expanded clay plant mix seals gave higher skid numbers than did the crushed gravel. The expanded clay slurry seal and Kentucky sand asphalt also resulted in high skid numbers. Of the asphaltic concrete mixtures the expanded clay hot mix showed the highest skid number after eleven months of traffic.

      Of all the test sections evaluated the plant mix seals gave the lowest roughness readings up to eleven months after construction, whereas, the Kentucky sand and slurry seals gave the highest.

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