For measuring and evaluating the bearing capacity of asphalt pavements within the central technical register of roads, FWD KUAB measuring devices are used; currently two devices are operated:
- KUAB 2 m – 150
- KUAB 2 m – 50
FWD deflectometer is a device for impact load testing of pavements generating loads by dropping a load onto damping pads placed on the surface of a circular load plate that is in contact with the pavement surface
device basic PARTS
- towing vehicle – Toyota Landcruiser
- two or single axle trailer equipped with deflection sensors and thermometers for measuring air and road surface temperature
- weight 1600 – 1800 kg,
- length 5.2 m x width 1.9 m x height 2.5 m
- distance meter
- computer with accessories
- KUAB software for controlling the device and analyzing of measured data
MEASUREMENT ON THE ROAD – VIDEO
measurement parameters:
- load range: 12 – 50 kN
- load ramp-up time: 23 – 17 msec
- load duration: 60 – 40 msec
- segment load plates: diameter 300 mm
- deflection sensors
- seismometers: 7 pcs
accuracy: 1 micrometer
- temperature meters
- air thermometer
- infrared thermometer for measuring pavement surface temperature
obtained pavement characteristics:
- pavement deflection
- pavement bearing capacity
TP 031 (technical regulation) – Measurement and assessment of the bearing capacity of asphalt pavements using the FWD KUAB device [PDF, 752 kB] (originally TP 01/2009, effective from 1.5.2009) determines the principles for measuring and assessing the bearing capacity of asphalt pavements with unbound or hydraulically bound base layers. TPs determine the technical parameters of the measuring equipment, the conditions for measuring and determining the measured locations, the procedure for preparing and performing tests at the measured point. They also define the necessary data in the test report and describe the method of evaluating the measurements.
List of Transport Departement Technical Regulations
Updated: 04.06.2026
Published: 1.12.2010