Transport and Main Roads
Deflection Response
o Benkelman Beam
o Deflectograph
o Falling Weight Deflectometer
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Deflection Response
o Benkelman Beam
o Deflectograph
o Falling Weight Deflectometer
Heavy weight deflectometer
HWD/FWD Bowl
Deflection Measurement Devices
- Benkelman Beam - Standard Axle Load
- 550 kPa Contact Stress
- Deflectograph - Standard Axle Load
- 750 kPa Contact Stress
- FWD/HWD - Variable Load
- Variable Contact Stresses
- Fixed Contact Area
Typical Deflection Bowl Shapes
under a Standard Axle (40 kN)
Load for the various Deflection
Devices used by Main Roads โ
see next slide
Typical Deflection Bowls Transport and Main Roads
Granular base โ 40kN Load
LOAD
Typical Deflection Bowls
CTB โ 40kN Load
- The absolute value of 40 kN
deflection measurements on Bound
Heavy Duty Pavements are too low
for effective/confident back analysis.
- Need higher loads for testing Bound
Heavy Duty Pavements
Deflection Surveys
The spacing of successive deflection tests is as follows:
Urban Areas
- Both inner and outer wheel paths for all lanes
- 25 m: heavy commercial vehicle lane (usually the outer lane)
- 50 m: fast lane
- 10 m: areas of high distress