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Sand And Aggregates
A pendulum arm, having a spring-loaded rubber slider
on the pendulum foot. Device is placed on the portion of the road surface to
be tested. It is then leveled, and the height of the center of suspension of
the pendulum is adjusted to a fixed value which is read on a special gauge.
The pendulum is then released from its horizontal position, to swing down
freely until the rubber slider contacts the test surface. As the slider
travels across the surface for a fixed distance, the pendulum is slowed and
a frictionally-constrained pointer affixed to the pendulum arm measures the
highest point in the pendulum arc.
Meets: - IS: 2386 (Part 4), ASTM E303