Physics:SCRIM
SCRIM (Sideway-force Coefficient Routine Investigation Machine) is a machine, originally developed by TRL Limited in the United Kingdom , used to measure the wet skidding resistance of a road surface.[1]
W.D.M. Limited and ARRB Systems Pty Ltd (iSAVe) manufacture sideways-force coefficient routine investigation apparatus for measuring wet road skid resistance. Newer devices such as the iSAVe (intelligent Safety Assessment Vehicle) incorporate dual-wheel path measurement and collection of ancillary data such as road geometry, texture, IRI and rutting to highlight areas of major safety concern.
The SCRIM machine has a daily survey capacity of 200 to 300 km, depending on road type. A SCRIM survey in the UK can be undertaken at two different target test speeds of 50 and 80 km/h. The permitted speed range covering these target speeds is 25 to 85 km/h.[2] Skidding resistance data recorded at speeds within this range can be speed-corrected to give equivalent values at 50 km/h.
Besides being the main equipment used for friction testing in the UK, it is also used in many other countries, including Spain , Italy, France , Belgium, New Zealand, Australia , Chile and Argentina .
Currently standards are being prepared by the ASTM for continuous friction measurement devices in the USA, including the development of a conforming tire.
The SKM is a similar device to the SCRIM. It also operates on the sideway-force principle, and is the main equipment used for friction-testing throughout Germany and the Netherlands.
Other friction testing devices include the Pavement Friction Tester, devices by Norsemeter, ViaTech, and the Griptester; all these devices have their own benefits.
References
- ↑ Hosking, JR,Woodford, GC (1 January 1976). measurement of skidding resistance part i. guide to the use of scrim (Report). https://trl.co.uk/reports/LR737. Retrieved 14 May 2018.
- ↑ "SCRIM® / SCRIMTEX | W.D.M Limited". http://www.wdm.co.uk/equipment/3-equipment/3-scrimr-scrimtex.
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