Asset management

Cover of Pavement Data Collection with a Traffic Speed Deflectometer (TSD) Device
Pavement Data Collection with a Traffic Speed Deflectometer (TSD) Device
  • Publication no: AGAM-T017-16
  • Published: 30 September 2016

This test method defines the procedure for measuring the deflection velocity of road pavements using a traffic speed deflectometer (TSD) device.

The TSD evaluates the structural capacity of a pavement by measuring the deflection velocity of the pavement under a load applied on a single axle through dual rear wheels. The magnitude of the load is typically 10 tonne but may vary according to need. These values are used to model the deflection bowl and report maximum deflection, curvature and other structural condition indexes. Testing is carried out continuously and reported at a 10 m or greater interval, with measurements being made in the outer wheelpath.

  • 1. Scope
  • 2. References
  • 3. Definitions
  • 4. Equipment
    • 4.1. System Specification
  • 5. Calibration and Validation
    • 5.1. Equipment Calibration
      • 5.1.1. Distance Transducer
      • 5.1.2. Strain Gauges
      • 5.1.3. Doppler Laser Angles
    • 5.2. Validation
  • 6. Procedure
    • 6.1. Pre-test Set-up
      • 6.1.1. Daily and other Periodic System Checks
      • 6.1.2. Temperature
    • 6.2. Deflection Velocity Survey
    • 6.3. Factors Affecting the Test
  • 7. Calculation
    • 7.1. Deflection Bowl
    • 7.2. Data Maximisation
  • 8. Reporting
  • Annex 1 Laser Safety