Sandberg is able to offer Polished Paver Value (PPV) testing to BS 7932:2003 [Determination of the unpolished and polished pendulum test value of surfacing units] for natural stone used in surfacing pedestrianized and/or trafficked areas.
Paving units can wear and/or polish under the action of vehicle tyres and heavy pedestrian usage. Establishing the extent of slip or skid resistance reduction is important.
Slip resistance is the property that reduces the risk of pedestrians slipping in wet conditions, while skid resistance is the property that reduces the risk of vehicles skidding in wet conditions.
Testing
Polished Paver Value (PPV) for pedestrian areas with high footfall is categorised in BS 7533-101:2021 [Pavements—natural stone paving units], which requires testing in accordance with BS 7932:2003.
BS 7932:2003 is used to evaluate slip resistance reduction before and after a specific regime of accelerated abrasive wear with emery grits on a flat bed polishing machine.
For stone paving, slip resistance pendulum tests are carried out in accordance with BS EN 14231:2003 to obtain the Unpolished Slip Resistance Value (USRV) and the Polished Slip Resistance Value (PSRV) to establish the reduction in performance.
