Wheel tracker EN12697-22 Large device
The equipment comprises a rigid steel frame supporting a stainless steel temperature controlled temperature cabinet with automatic opening double glazed doors for excellent access and vision. Load is applied using pneumatic cyslinders and precision pressure regulators. The wheels are reciprocated with true sinusoidal motion and the speed is controlled in closed loop through the computer and inverter. User friendly Lab View software guides the user through the test according to the procedure set out in EN12697-22. On screen the rut history can be analysed in three different views at any time during the test. Data and graphs can be saved to file on completion of the test.
Universal servo hydraulic testing system
The CRT-HYD25 is a servo-hydraulic machine for testing range of asphaltic paving materials, subgrade soils and granular sub-base materials.
Universal servo pneumatic testing system
This machine is a development of the NAT which was conceived by K E Cooper and Professor S F Brown at the University of Nottingham.
Stand Alone Four Point Bending Beam System
NOTE Beams can be difficult to produce. We recommend the CRT-RC roller compactor and CRT-RCENLD-II for compaction of slabs to be cut into beams. Roller compaction is the best method of producing slabs from which representative specimens can be cut.
Dual Two Point Trapezoidal System
This test was developed at LCPC. It has now been adopted as one of the two methods in EN13108-20 for determining fatigue and one of the six modulus methods.
Roller compactors
Roller compaction is the only reliable laboratory method of producing wheel tracking specimens and beams for fatigue and modulus tests. Cores can also be taken from slabs of asphalt making it the most versatile method of test specimen production.
CRT-WTEN1 & CRT-WTEN2
The Cooper Research CRT-WTEN1 wheel tracker performs both of the test methods that are specified for a small scale device in EN 12697-22.
Temperature controlled cabinet
The temperature can be controlled to 0.2ºC over the range -10ºC to + 60ºC using a P.I.D. digital temperature controller, the CAL3200. Forced air over the heater and cooling fins and through the air duct in the rear wall ensures a uniform temperature throughout the cabinet. Defrost water drains via a pipe on the back of the cabinet to a heated tray underneath the cabinet where the water will evaporate.
Large device EN roller compactor
Roller compaction is generally considered to be the best method of compacting asphaltic paving material in the laboratory. Slabs compacted with the CRT-RCENLD-II can be used in the “Large size” wheel tracker developed in France, cut into prismatic or trapezoidal specimens or cored for use in indirect tensile or axial loading tests. The compactor can be configured for single or dual wheel compaction and wheel loads can be selected in the range 1 to10kN. A single wheel is used to compact 500mm x 180mm slabs for testing in the large-size wheel-tracker and the dual wheel configuration is normally used for compacting the 600mm x 400mm slabs that are sawn into smaller shapes for other tests.