Stands for Pendulum Skid Tester
The Cooper-Wessex Pendulum Skid Resistance Tester
the established world leader in its field. Originally designed in the
1940s in the US, the instrument (also known as British Pendulum Tester
or Portable Skid Tester
was further developed in the 1960s at
the UK Transport Research Laboratory for the testing of road surfaces.
Pendulum Skid Tester,
CRT-PENDULUM PST measures the frictional resistance between a rubber
slider mounted on the end of a pendulum arm and the test surface. This
provides highway engineers with a routine method of checking the
resistance of wet and dry surfaces to slipping and skidding, both in the
lab and on site.
It is based on the Izod principle: a pendulum rotates about a
spindle attached to a vertical pillar. At the end of the tubular arm a
head of known mass is fitted with a rubber slider. The pendulum is
released from a horizontal position so that it strikes the sample
surface with a constant velocity. The distance travelled by the head
after striking the sample is determined by the friction of the sample
surface. A reading of Skid Resistance is obtained.
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