Abstract
Skip resistance of asphalt is an important parameter that can influence the safety of drivers on roads. Although there is a linear relationship between slipping on road surfaces and accidents, the impacts of pollutants for decreasing friction of roads is clear to researchers. Moisture and temperature influence friction and safety. In this research in SMA samples, three different gradations with the maximum nominal sizes of 19, 12.5 and 9.5, based on international standards were used. For polluting the surface, five materials that are found on roads were used, including fine-grained soil, sand, oil, soot and rubber powder. To measure the skip resistance, the British pendulum tester was used and for analysing macro-texture, the sand patch method was used. The results of this research showed that by increasing the maximum nominal size of aggregates, the depth of macro-texture in surfaces are grown and this is due to the decrease of fine aggregates in larger gradations. Because of the higher flexibility of pure bitumen, the applied compression pressure on rigid aggregates can cause indentations in the substrate and result in declining the roughness height of aggregates in the mixed surface. This leads to declining the hysteresis part of friction by increasing temperature.
Highlights
Every day around the world, road accidents occur
There is a linear relationship between slippery road surfaces and accidents [6]
Five common and most important pollutants that are seen on road surfaces with low seasonal rainfall and deserts were used for the simulation
Summary
Every day around the world, road accidents occur. Driver errors, poor transportation system and poor road infrastructure contribute to these accidents [1,2,3,4,5]. The increase in the number of accidents after the first rainfall during a dry period is due to the existence of particles on road surfaces (dust, rubber debris, exhaust fumes, equipment, etc.) [8]. It seems that the accumulated particles during the dry periods and water from the first rain create a mixture of high viscosity and decreases friction [9]. Fine particles from the road, rubber debris or traffic and dispersion of industrial materials can be the source of safety issues such as accidents on the first day of rain after a dry period or season change of skid resistance [10]. This article provides an experimental study under a controlled situation, analysing the accumulation of particles and cleaning by flow and surface water
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More From: Scientific Journal of Silesian University of Technology. Series Transport
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