Hamburg Wet & Dry Wheel Tracker CRT-WTIM
Hamburg Wet & Dry Wheel Tracker CRT-WTIM
Hamburg Wet & Dry Wheel Tracker CRT-WTIM
- Description:
Hamburg Wet & Dry Wheel Tracker CRT-WTIM
- Model:
CRT-WTIM
- Manufacturer:
Cooper
Product Information
  • Description
  • Standard
  • Feature
  • Specification
  • Configuration
  • Software
Description

汉堡车辙仪 CRT-WTIM

The Hamburg type dual arm immersion Wheel Tracker is widely used to evaluate the resistance to rutting and moisture susceptibility of asphalt mixtures following either EN12697-22 or AASHTO-T324.


The device was developed in the 1970’s by Esso A.G. of Hamburg, Germany. It was based on the TRL wheel tracker which is also now included in EN12697-22. Originally the Hamburg test was used by the City of Hamburg to measure rutting susceptibility.


The test was performed for 9,540 wheel passes at either 40 or 50°C. Water was used to obtain the required test temperature rather than air. The City of Hamburg later increased the number of wheel passes to 19,200 and found that some mixtures began to deteriorate from moisture damage. Greater than 10,000 wheel passes was generally needed to show the effects of moisture damage.


Specimens can be prepared in the laboratory, or cores taken from the road can be used. Loaded steel or rubber wheels track a sample under regulated load, speed and temperature, whilst the development of the rut is constantly monitored and recorded throughout the test.

Standard

• EN 12697-22

• AASHTO-T324

• TEX-242-F

Feature

• Advanced machine with 4 testing modes: Wet, Wet heat,Dry and Dry heat (with optional heating hood)

• State of the art software which provides higher level users with options, and lab technicians ease of use

• A dedicated immersion Wheel Tracker (wet and dry wheel trackers compromise on temperature control)

• A mechanical re-circulating water bath controls the temperature to within ± 0.5°C in a range of (20-75) ºC

• Variable speed range between 15 and 30RPM

• Two displacement transducers attached to the wheel support arms measure the depth of the ruts as they develop with a resolution of 0.01mm to a  rut depth of 50mm

• The depth of the rut is measured automatically and constantly as specified in the AASHTO and EN standards

• Rubber or stainless steel wheels, and various widths to alter the applied pressure

• Various mould options including laboratory compacted and cores (AASHTO and EN)

• UKAS Certificate supplied

• Cooper is the Wheel Tracker manufacturer

Specification
DescriptionTechnical Specification
Wheel SpeedVariable up to 30 cycles(60 passes) per minute
Wheel Load700 ± 10 N
Mould Dimensions305x305mm、305x400mm
Slab Thickness50~100mm (different thicknesses can be tested with spacers)
Rut Depth Transducer Range50mm
Temperature Range20℃~75℃
Electrical Supply380V/50Hz  16A
Dimension1430 x 1380 x 1260mm  (WxDxH) 
Estimated Weight687kg
PCIncluded


Configuration
Accessories/Spare Parts

• CRT-WTIM-260501 Stainless Steel Molds 320 x 260 x 50 mm depth

• CRT-WTIM-2601001 Stainless Steel Molds 320 x 260 x100 mm depth

• CRT-WTIM-2DIAM1501 Plastic mold for double cores 6” tested simultaneously to be inserted in Stainless Steel mold 320 x 260 mm

• CRT-WTIM-2DIAM150_501 Plastic mold for double cores 6” tested simultaneously to be inserted in Stainless Steel mold 320x260 mm

• CRT-WTIM-WHSS Stainless steel wheel for Immersion Wheel Tracker according to AASHTO-T324

• CRT-WTIM-WHR Rubberized Stainless steel wheel for Immersion Wheel Tracker according to EN 12697-22

• CRT-WTIM-LIFT Arm lifting hoist

• CRT-WTIM-DRY Dry testing option