Objektiv mätmetod för tillståndsbedömning av grusväglag

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Karin Edvardsson

Condition ratings on the gravel road network are of today made subjectively according to the Swedish Transport Administration’s current method description. This project aims to develop a reliable, objective and mobile methodology for continuous measurement of the road surface condition parameters: evenness, loose gravel, dust and cross fall on gravel roads. It also aims to recommend an objective inventory method for evaluating the drainage condition of a gravel road construction. The result shows that the objective condition indicators which best seem to describe the requested functionality on gravel roads are the acceleration measured using a smartphone application as well as macro texture expressed as the mean profile depth MPD and the average laser pulse reflection over the road cross section measured with a laser equipped measurement vehicle. As an objective inventory method for evaluating the drainage condition of a gravel road, measurements of ditches to ensure satisfactory ditch depth, measurements of cross fall, measurements of support strips to ensure absence of road edge overhang that prevent water runoff from the road, and measurements of periodic and/or rapidly proliferating roughness are proposed. Since gravel road condition is rapidly changing during the season, a quick and simplified version of road surface measurements is required if it should be cost effective with these types of measurements on the gravel road network. Using a smartphone with an application for measurements of evenness is a simple and cost effective way to generate up-to-date condition data for the gravel road network. The application could be supplemented with a button to allow the public to report and mark out damages to the road or be connected to the contractor’s GPS-enabled reporting system, used to mark special points of interest, such as sites for frost heave or erosion.

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