Function - impact AG139 Guia Del Usuario

Function

The function of the Accelerated Polishing Machine is to produce polished stone
samples of aggregates used in road surfaces, to simulate actual road conditions.
The samples produced form an integral part of the Polished Stone Value (PSV) Test.
The PSV Test is a friction test that calculates a measure of resistance to skidding,
performed using a Skid Resistance Tester.
Road Safety
The use of PSV's in road construction has had a major influence in the reduction of
accidents.
Standards
In order to understand and carry out the PSV Test, one of the following documents is
necessary:
BS 812 Pt 114, BS EN 1097-8:2000, ASTM E303.
Operation Overview
Fourteen specimen aggregate samples are clamped around a rotating Road Wheel.
These samples are subjected to two timed stages of abrasive polishing under a
loaded rubber tyre. First by Corn Emery grit, and secondly by Flour Emery powder.
- 4 -