Wheel tracking is used to assess the resistance to rutting of asphaltic materials under conditions which simulate the effect of traffic. A loaded wheel tracks a sample under specified conditions of load, speed and temperature while the development of the rut is monitored continuously during the test. Test specimens can be either slabs prepared with a laboratory compactor or 200mm Ø cores cut from the highway.
The BM585 Wheel Tracker performs both procedures A and B specified for the small scale device in EN 12697-22. Procedure A requires that six specimens are tested. For procedure B, only two specimens need to be tested, but rut depth must be measured at more points along the longitudinal rut profile.
Standards
EN 12697-22 Small device, AST 01:2004, BS 598-110:1998
Features
- Test materials for roads with axle loads up to 13 tonnes
- Rigid test frame built from extruded aluminium section
- Integral temperature controlled cabinet with double glazed doors
- PID control of test temperature in the range of 40ºC to 62ºC
- Rack for pre-test temperature conditioning of specimens
- The CRT-WTEN2 tests two specimens simultaneously
- Specimens compacted with a compatible Roller Compactor can be transferred directly to the wheel tracker without de-moulding
- Closed-loop speed control
- User-friendly Windows™ software
- Supplied with certification of a UKAS accredited calibration
Software
- User friendly, intuitive and reliable Windows™ software
- Software is designed to perform EN 12697-22 Small device
- Software automatically starts the wheel tracker, maintaining the speed at the specified 26.5 cycles per minute
- Measures rut deapth and sample temperature automatically at regular intervals
- A continuously updated on-screen graph shows rut depth versus time, along with the rut profile and temperature
- Software stops the wheel tracker on completion of a test and prints a test if required
- Stored test data can be analysed and compared with other test data utilising a spreadsheet package
- Utilities are included for transducer check, diagnostic routines and RTD calibration
The BM585 Wheel Tracker consists of:
- A solid extruded aluminium frame supporting an insulated cabinet which uses PID control linked to a PRT for accurate closed loop temperature control
- A rubber-tyred wheel runs on top of the specimen and applies 700 or 52M to the specimen
- A table which is reciprocated a distance of 230mm on linear bearings at 26.5rpm.
- One LVDT for rut measurement
- Large double glazed doors for full access which enable visual monitoring of the test if required
Specification
| Wheel Load |
700/520N |
| Mould Dimensions |
305mm x 305mm (others available) |
| Wheel Speed |
26.5 cycle per minutes |
| Slab Thickness |
40 to 100mm (others available) |
| Rut Depth Transducer Range |
50mm |
| Temperature Range |
40 to 60ºC |
| Electricity Supply |
220-240 Volts 50/60Hz @13A (others available) |
| Compressed Air |
Dual 7-10 bar @ 600L/min |
| Dimensions mm (WxDxH) |
1579mm x 840mm x 1740mm |
| Working Space required mm |
1680mm x 1840mm x 1940mm |
| Estimated weight |
448kg |
| PC |
Included |
