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Correlation of Rut Depths Measured by the Profilers of LTRC and DOTD PMS
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2023-08-01
[PDF-18.14 MB]
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Edition:Final Report November 2020 to May 2023
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Abstract:This research study aimed at developing a correlation of rut depths measured with Louisiana Transportation Research Center's (LTRC’s) profiler with a 5-point laser system and Department of Transportation and Development (DOTD) Pavement Management System's (PMS’s) profiler with a scanning laser system. For this purpose, the transverse profile data collected in 2020 and 2021 at the eight pavement management control sites with flexible and composite pavement by both LTRC and Fugro road profilers were analyzed. Additionally, 25 sites were selected to represent the typical pavement conditions and characteristics of the Louisiana highway network. Three repeat runs of LTRC's 5-point rut bar system were first made at six control sites and four selected sites. The correlations of the calculated rut depths indicated that the repeatability of LTRC's 5-point rut depth at the individual point level was not that good. However, averaging rut depths over 0.004-mile and 0.1-mile increments showed noticeable improvements of correlation, especially for average rut depths over 0.1 mile which achieved an overall correlation value of 0.90 and above. The current rut algorithm of Roadware Vision causes incorrect measurements that include measurements in cracks, measurements outside wheel path, and failure of locating the point of maximum rut depth. LTRC's 5-point rut bar system cannot always capture the maximum rut depth for transverse profiles (missing the peak and valley). It can also be significantly affected by the edge drop off and grass for right wheel path (RWP) rut depth. The correlations of average rut depths were higher than correlations of the left wheel path (LWP) and RWP. Averaging rut depths over 0.1-mile increment showed noticeable improvement of correlation between LTRC and Fugro road profilers. The results of t-tests showed that mean values of LTRC's 5-point rut depth and Fugro's full profile rut depth were statistically different at all scales (individual rut depth, 0.004-mile average rut depth, and 0.1-mile average rut depth). The t-tests also showed that the mean values of LTRC's and Fugro's 5-point rut depth were statistically differently at individual and 0.004-mile average level. However, with careful planning, the difference between the mean value of LTRC's 5-point rut depth and Fugro's 5-point rut depths at 0.1-mile average level could be statistically insignificant. A standard operating procedure (SOP) was developed to standardize the process of collecting and compiling rutting data by LTRC at the network level and delivering them to DOTD engineers for conducting/supporting pavement management activities.
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