Description of the measurement
The water wets the road surface in front of the test wheel. Sideway friction force spawns from the contact surface of the measuring wheel and the wet road. This force is measurable as pressure force (Ff) on the axle of the test wheel. The sideway frictive coefficient (SFC) is the quotient of this force (Ff) and the wheel load (G = 2000 N).
SFC = Ff/G
The measured and stored data is processed by the relevant software and by which:
– The SFC values can be printed
– Statistical calculations can be executed
Developed by the Transport and Road Research Laboratory (TRRL), United Kingdom.
Measuring device:
- A MAN TGA base vehicle (equipped with 10.000 l water tank),
- Measuring wheel aligned at an angle of 20 degree to the course,
- Vertical load of the measuring tyre G = 2000 N
Measuring tyre:
- AVON 3,00″x20″
Measured value:
- SFC angular friction coefficient
Data collection:
- With a speed of 50 km/h, at every 5, 10 and 20 m-s
Water-layer thickness:
- 0,6 mm
Wheel Track to be tested:
- Right side
Utilization area:
The SCRIM is used to measure the wet skid resistance of a road surface.