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Wheel Tracker Large Device CRT-WTENLD Optimisation of the wheel tracking test time and result accuracy through computerised control 48
BRIEF INTRODUCTION Wheel tracking is used to assess the resistance to rutting of asphaltic materials under conditions which simulate the effect of traffic. In this machine, two 500 x 180mm specimens are tested simultaneously by tracking with wheels fitted with pneumatic tyres under specified conditions of load, speed and temperature while the development of the rut profile is monitored at specified intervals during the test.The moulded specimens are inserted and removed from the wheel tracker using an Easy-load system. A unique instrumented measurement device, linked to the data acquisition, is used to measure the development of rutting during testing. The test procedure and conditions are controlled and data acquired using Windows software running on a host computer via a high speed digital interface and signal conditioning system. KEY FEATURES • Tests materials for roads with axle loads of at least 13 tonnes • Unique rut profile measurement device linked to data acquisition system • Integral temperature controlled cabinet • Test temperature range 40 to 60°C • Tests for specified number of cycles or to specified rut depth • Double glazed doors for viewing test • Easy-load system for specimen handling • Conditioning of specimens at test temperature • User friendly Windows software • Automatic test start/stop • Closed loop speed control • Specimens can be compacted in the CRT-RCENLD-II and then wheel tracked without demoulding • Supplied with certification of a UKAS accredited calibration KEY USES • Determination of the rut resistance of asphaltic paving materials STANDARDS • EN 12697-22 Large device • NF P98-253-1 SYSTEM ELEMENTS The CRT-WTENLD is comprised of: • A rigid metal frame supporting an insulated cabinet which uses PID control and four PRTs(two specimen and two air) for accurate closed loop temperature control • Two tables which are normally set to lift and apply 5kN load to the moulded specimens • Two 400mm Ø pneumatic tyres that are reciprocated in a sinusoidal motion a distance of 410mm at a frequency of 1Hz • Three LVDTs on the rut profile measurement device • Two automatic vertically sliding double glazed pneumatic doors which provide excellent access and enable visual monitoring of the test when required • An LCD screen and keyboard which are installed on an arm with adjustable height www.cooper.co.uk 49
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