1.0 SYSTEM DESCRIPTION
PaveTesting® Pave®Lok measures the coefficient of friction of pavements using a Locked Wheel in accordance with ASTM standard E274.
The system consists of a specially equipped vehicle and a specially equipped towed two-wheeled trailer.
The trailer uses an ASTM standard ribbed or smooth test tire, which can be pulled over a paved surface by the truck at a constant velocity while a nozzle dispenses water in front of the tire to simulate wet conditions. The test wheel of the trailer is coupled by a disc brake assembly to a calibrated force transducer, which measures the traction force and load on the wheel under braking. The electrical/mechanical devices in the trailer are controlled by the computer system electronics in the pickup truck in combination with switches on an operator's control console.