SCRIM

The lateral force measurement method ( SKM short or Sideway -force Coefficient Routine Investigation Machine, shortly SCRIM ) is a process developed in the UK test procedures for measuring the skid resistance of road surfaces of asphalt, mastic asphalt and concrete. In addition to quality assurance during construction of new roads, it is also used for the evaluation of longer existing road surfaces.

Measurement methods

In this measuring method (carrier vehicle is a 7.5 tons or greater Trucks> 12.0 tons) by means of a fast-moving dynamic measuring vehicle detected by a test set in the right Radrollspur the cornering. This determination of Seitenkraftbeiwertes is the grip of the respective audited Deckschichtart again. The fast moving dynamic measuring vehicle has a linearly guided measuring device, which is incorporating the right in the Radrollspur between the front and rear axle. Depending on the size of the vehicle is carried by means of a water tank with a volume of 3.5 m³ up to 8 m³ of water. By controlling the water is fed via a tube system to a water guide carriage speed-dependent. This water guide carriage lowers itself to the test fixture and creates a water film thickness of about 0.5 mm.

The specially -profiled measuring tire is used on the roadway so that it is drawn with a fixed predetermined angle of 20 ° to the Radrollspur on the road. In the course of the lowest possible friction of the entire system, and the inclination of the previously described, the force is measured in combination of a load cell, which is perpendicular to the wheel axis is formed as a result of friction and which presses the wheel in the direction of travel back. From the ratio of the measured lateral force and the wheel load, the lateral force μSCRIM (also sideway -force coefficient, short SFC) are calculated. The method can be used only seasonally limited as technical specifications are given in the guidelines.

Measuring vehicle

Various computer units, which are installed in the fast-moving dynamic measuring vehicle can capture and store more sensory characteristics. For example, temperature measurements of the water, the air, the road and the oblique easy-rolling measuring wheel are held here, which are used in the calculation of the Seitenkraftbeiwertes consideration.

Such a fast -moving dynamic test vehicle is required by construction agencies or private companies and certified by defined test procedures, quality control, which are converted into concepts such as inspection, control tests, or the end of the limitation period. Due to the design advancements have been created that allow the size or the use in subordinate route networks ( light vehicles ).

Norms and Standards

• Technical test for grip measurements in road part: lateral force measurement method (TP - handle StB )