HWD

Heavy Weight Deflectometer

Heavy Weight Deflectometer

Dynatest developed the first commercially available Heavy Weight Deflectometer (HWD). The HWD is highly versatile and can be used to test on both rigid, paver block and flexible pavements on roads and airports. The HWD can apply a loading in the range of 30-320kN, enabling it to simulate vehicle loading from to the most extreme aircraft wheel load such as the Boeing 777, the Airbus 340, or 380.

The output from the deflectometer can be used:

  • To determine the layer of failure and the optimum rehabilitation solutions.

  • For quality control or existing and new pavement construction

  • Improve and understand pavement modeling

  • In pavement management

  • In pavement research

Download brochures

HWD Brochure
HWD Brochure US

Key benefits

  • Dynamic loading enables mechanistic-empirical analysis of the pavement layers and the determination of optimum rehabilitation strategies

  • Automated and rapid structural pavement testing

  • Determines the layer of failure, rather than determining simply the bearing capacity

  • QA/QC of newly built pavements

  • Compares a range of rehabilitation options, including plane off and recycling rather than just applying overlays

  • The Dynatest HWD provides accurate, reproducible, and repeatable data

  • Automated and real-time monitoring of the load cell, geophones, and data variations ensures high quality of collected data

  • Uses mechanistic analysis allowing testing of most pavement structures

  • The HWD is used worldwide from the hottest and driest deserts to the humid tropics and the cooler polar regions

Get a closer look

Meets ASTM D-4694, D-4695 and equivalent standards

Peak load range approximately 30 to 240kN / 320kN

Up to 15 seismic deflection sensors

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Standard Equipment

  • 4 segmented loading plate with swivel commodates uneven or rutted pavement surfaces
  • 7 or 9 deflection sensors (geophones)
  • Air/Pavement Temperature Sensors
  • Distance Measuring Instrument (DMI)

Available Options

  • Global Positioning System (GPS)
  • Camera system for plate location or Right of Way Imaging
  • On board generator for standalone operation
  • Trailer mounted light(s) or strobe(s)
  • Rear or rear and transverse sensor extension bars
  • Ground Penetrating Radar (GSSI or IDS)
  • Spare parts kit
  • Tool kit

ELMOD Software - only available for Dynatest Equipment

  • Evaluation of Layer Moduli and Overlay Design
  • Dynatest’s ELMOD software may be used for the analysis and design of flexible, rigid, and composite pavements
  • Allows quick data reduction and analysis of FastFWD load/deflection measurements
  • Capable of backcalculation of the layer moduli, for a typical drop sequence, in less than a second
  • Fast calculation of the seasonally adjusted moduli, residual life of the pavement, and required overlay thickness for a given service life
  • For maintenance and rehabilitation (M&R), the LCCA (Life Cycle Cost Analysis) module allows the user to select the optimum M&R solution
    for a pavement section according to cost/benefit ratios
  • For analysis of airfield pavements, the optional PCN module calculates PCN in accordance with the ACN/ PCN method, as described in the ICAO and FAA design manuals

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