Discussion on the Procedure of Estimating Pavement Skid Resistance by Using Pavement Texture
Date Issued
2015
Date
2015
Author(s)
Lee, Cheng-Chun
Abstract
Skid resistance measurement is one of the major assessments of road safety. The typical devices used for measuring skid resistance include single point checking type and continuous measurements type. Due to the limited capacity of water supply used by all kinds of devices, including the continuous types, it is a relative time consuming and difficult task to periodically conduct a full roadway network skid resistance survey. On the contrary, measurement of pavement surface texture can be conducted easily and continuously by most of the profilers. Two measuring devices, Grip Tester and NTU Profiler, were used in this study to collect the data of pavement skid resistance and texture. The MPD and mean difference of elevation (MDE) were chosen to compare with the skid resistance. Through the normalization process, the impact of testing speed of profiler on the texture indices was reduced. Because of the better relation with the skid resistance, this study used MDE as the pavement texture index in further analysis. This research studied the relation between pavement skid resistance and the surface texture. The focus was on the development of a texture index which can serve as a screening indicator to filter out the high risk pavement sections for further skid resistance measurement. This study divided total 5,550 meters into 80% and 20% randomly, which was used to discuss, analyze and set the MDE threshold and to validate the result of 80%, respectively. Through a sensitivity study of the 80% data, it was found that the MDE threshold of 0.15mm can provide a relatively reasonable screening function that filters out 30.63% of the entire surveyed network for further skid resistance inspection. It averted about 70% skid resistance measurement capacity of the entire network. The accuracy of judgment by the selected threshold was more than 75%; only 4.05% of roadway sections that were considered for further inspection of the recommended list needed not be included. The sensitivity study of the rest 20% data shows the similar result to it of the 80% data that the percentage change in four quadrants is stable which is not influenced by different road section. This result shows the method of using MDE as threshold to filter out the low skid resistance roadway segments for further inspection is practical.
Subjects
Pavement
Skid Resistance
Texture Index
Type
thesis
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