Non-contact skid resistance measurement : final report, December 2009.
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Non-contact skid resistance measurement : final report, December 2009.

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  • English

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      Final report; Jan. 2008-Dec. 2009.
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    • Abstract:
      In this research, a correlation between the SN40R collected by locked wheel skid tester and the

      texture data or Mean Profile Depth (MPD) collected by a vehicle mounted laser operating at highway

      speeds was developed. The proposed correlation between SN40R and MPD is positive for MPD values

      less than 0.75 mm to reach a peak SN40R value, then it becomes a negative correlation of decreasing

      SN40R values with increase in MPD values until the MPD values reached 1.15 mm, which was the

      maximum value measured in this research. However, the slope of the negative correlation becomes

      smaller with increasing MPD. It was also observed that there is significant data scatter for the MPD

      value of 0.8mm. The test result showed a similar trend for old asphalt pavements, but with lower SN40R

      values due to polishing of pavement micro-texture by traffic. Based on the comparison between old and

      new asphalt pavements, reduction coefficients, which is a functions of road treatment time and traffic

      volume was developed to account for the traffic polishing effect on micro-texture of pavement.

      This report also describes two field tests performed to validate the above correlation and

      development of an interface for the PMS to upload the predicted skid data from texture data obtained

      from high speed laser. During the field tests, MPD values and SN40R were collected by a vehicle

      mounted laser and a locked wheel skid trailer, respectively. Then the comparison between predicted

      SN40R by using the developed correlation between SN40R and MPD and measured SN40R are

      conducted. For the prediction of SN40R, reduction coefficient, which is a function of traffic volume and

      pavement age (treated or refurnished age), were used to take into account the polishing effect traffic on

      micro-texture of the pavements. The results show that the measured and predicted SN40R values

      match each other very well with the maximum variance between them less than 5. Based on the

      validated correlation between MPD and SN40R, an interface for the PMS was developed to extract and

      process MPD data collected by vehicle mounted laser and report predicted skid number to NJDOT

      pavement management system.

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