Road slipperiness

The grip describes the size of the frictional resistance and the power transmission between the vehicle tires and the road. Essentially, it involves driving and braking forces and lateral forces from cornering. The traction conditions on a road have a major impact on the safety of the traffic. So have dry road surfaces are all relatively high grip levels. When riding in wet or icy road surface grip values ​​decrease according to road speed and surface texture greatly. In the area of road construction, the property of the grip is an important feature in the condition assessment and evaluation of new or existing road surfaces. Therefore, the grip is tested using different instruments.

Factors

The skid resistance of a road surface is influenced by various factors:

  • Water film thickness on the road surface ( aquaplaning )
  • Roughness of the road surface
  • Tire condition and tire characteristics
  • Speed

Operation

Decisive for the grip is the roughness in the contact area between road and tire. We call this property as " sharpness ". Smooth and polished road surfaces can not guarantee this Rauhkeit and must be roughened or renewed by appropriate action. The aggregate used in the pavement should be fractured and polished as possible resistant. Furthermore it must be ensured that the bitumen content is kept low to avoid " over-rich " of the asphalt pavement.

Skid resistance

Important in the production of new road surfaces is the formation of a sufficient initial tack. New layers of asphalt have shortly after their production on an insufficient grip, there is still a thin layer of bitumen ungebundes is at the surface, which covers the underlying aggregate. By rolling in sand or grit directly in the production (so-called blunting, Absplitten or sanding ) the roughness of the surface is increased, thus ensuring the required skid resistance. After some time, the overhead bitumen layer is traversed, so that the aggregate is exposed.

Of concrete roads, the surface also has to be provided during manufacture. To this end, measures such as the so-called broom finish or redrawn Jutetuch applied. Is also in the concrete road on the surface a thin layer of cement which is scanned over time.

25087
de