Abstract
Skid resistance of road surfaces is an important safety parameter. Decreasing skid resistance correlates with increasing number of accidents. The presented study aims for a correlation between lab-based polishing simulation and skid resistance measurement and evolution of the skid resistance under traffic in the field. A prediction model for skid and polishing resistance based on the Wehner/Schulze device was developed. The lab procedure as a basis for the model works on the hypothesis that a maximum level of skid resistance exists that can be regenerated even from a highly polished state by sandblasting of the surface. This hypothesis was verified for an asphalt and concrete surface material. The prediction model was set up by correlating field data on skid resistance and traffic volume from 14 test sections to cores taken from these test sections and tested in the lab. A linear regression links the cumulated traffic volume in the field with the number of polishing passes in the Wehner/Schulze device. Thus, it is possible to simulate millions of wheel passes within a couple of hours in the lab to generate equal skid resistance level and predict the skid resistance level of a road surface after years under traffic.
Highlights
The skid resistance of road surfaces has a crucial impact on road safety in general (Hatherly et al 1969)
The study presented in this paper aims to contribute to the work on correlating laboratory and field measurements of skid and polishing resistance by developing a prediction model (PROGRIP) for the skid and polishing resistance based on the Wehner/Schulze device and actual traffic data from the field
D evelop a lab procedure based on the Wehner/Schulze device to predict the evolution of the skid resistance under traffic in the lab and calibrate it to field data
Summary
The skid resistance of road surfaces has a crucial impact on road safety in general (Hatherly et al 1969). The Wehner/Schulze device, developed in the 1960s in Germany (Wehner 1968, Schulze 1968), is a combined test stand for simulating polishing and skid resistance measurement on flat, circular surfaces and can be employed for studying arbitrary surfaces, including aggregates, and actual road surface layers from field cores or lab produced samples. The Wehner/Schulze device has been increasingly used in research in recent years to study skid resistance of aggregates, surface layers and correlations between lab and field measurements (Do et al 2007, Kane et al 2008, Wang, Yin, et al 2011, Wang, Chen, et al 2015, Wang, Xie, et al 2015, Kane et al 2013). The study presented in this paper aims to contribute to the work on correlating laboratory and field measurements of skid and polishing resistance by developing a prediction model (PROGRIP) for the skid and polishing resistance based on the Wehner/Schulze device and actual traffic data from the field
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