LİYA TEST The Pendulum Skid Tester 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.