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- W746656367 abstract "Skidding resistance of the Dutch trunk road network is monitored with a measuring device which performs its measurements by means of a rotating wheel, 86% slip, under wet conditions at a speed of 70 km/h. In the Netherlands, all evaluation of road safety relating to skidding danger used to take place on basis of these measurements only. In 1991 an accident took place on a Dutch highway at a site where porous asphalt was recently laid, and it appeared that the breaking distance was unusually long. Tests on this particular site and on other locations throughout the country confirmed this result; the breaking deceleration which was obtained when breaking on new porous asphalt pavements in case of an emergency stop (locked wheels) was found to be typically 5,5 m/sq s. When braking with a vehicle equipped with an anti-locking system, on the other hand, a deceleration of 10 m/sq s or even higher was found. During further investigation it was found that the measurements used for monitoring purposes do not not correlate with decelerations obtained in emergency stops: newly laid porous asphalt was found to have the highest wet (standard) skidding resistance of all the mixes investigated, but the lowest breaking deceleration in emergency stops. It was found that the reason for this unexpected result was related to the presence of mortar at the surface of new porous asphalt. The friction energy generated at the pavement/tyre interface causes a thin layer at its outer surface to melt during breaking with blocked wheels. This, in turn, causes the vehicle to start sliding. During wet measurements this, of course, doesn't happen. In further research two paths were followed: many different kinds of cleaning and skid resistance enhancing techniques were applied in test tracks. None of these was found to be fully satisfying; a more theoretic investigation was set up. On the basis of a simple energy-balance of the emergency stop, it was calculated that the temperature at the pavement/tyre interface could rise to about 350 degrees C. Computer calculations were performed on mortars with higher values of heat conductivity, heat capacity and density. A next step in this investigation will be to determine how much these properties, and the viscosity of mortars at elevated temperatures, can be improved without handing in (too much) on the mortar's other appreciated properties. (A) For the covering abstract see IRRD 890329." @default.
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- W746656367 date "1997-01-01" @default.
- W746656367 modified "2023-09-23" @default.
- W746656367 title "A MATERIAL TECHNOLOGICAL APPROACH TO THE LOW INITIAL SKID RESISTANCE OF POROUS ASPHALT ROADS" @default.
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