SCRIM® celebrates 50th anniversary
To celebrate the 50th anniversary of the SCRIM® (Sideway-force Coefficient Routine Investigation Machine), we share a SCRIM fact each week during 2017.
Fact #1: W.D.M. Limited celebrate the 50th anniversary of SCRIM in 2017 – it was the machine that resulted in the company first becoming involved in the highway asset management sector.
Fact #2: SCRIM is an acronym for Sideway-force Coefficient Routine Investigation Machine.
Fact #3: The first SCRIM came off the WDM® production line in 1967. It was built for TRRL, the Transport Road Research Laboratory.
Fact #4: SCRIM measures the wet road skid resistance to ensure the surface meets regulatory levels and is safe for vehicles to use.
Fact #5: SCRIM measures the microtexture (roughness) of the surface chippings by lowering a freely rotating wheel on to the road at an angle of 20% to the direction of travel, under a fixed load. A jet of water is sprayed on to the surface immediately in front of the wheel, which is in continuous contact with the road. The force exerted on the wheel is measured by a load cell.
Fact #6: The SCRIM measurement tyre is a slick – it has no tread to influence the skid resistance of the road surface and is specially made for WDM® to fine tolerances to ensure consistency.
Fact #7: SCRIM operates around the world and there are machines in 18 countries.
Fact #8: WDM® has built more than 80 SCRIMs since the first one rolled off the production line in 1967.
Fact #9: Measurement wheels are normally mounted on the nearside of the vehicle, but some have measurement wheels on both sides, particularly those manufactured for overseas clients.
Fact #10: WDM® operates a fleet of SCRIMs in the UK, surveying the motorway network and main trunk roads.
Fact #11: The water tank on a SCRIM ranges from 1,900 to 12,000 litres.
Fact #12: SCRIM® uses an inertial GPS system to ensure total accuracy of its data.