FFWD

Fast Falling Weight Deflectometer

Fast Falling Weight Deflectometer

The Fast Falling Weight Deflectometer (FFWD) is 5 times faster per drop than the original Falling Weight Deflectometer. The FWD is designed to impart a load pulse to the pavement surface simulating the load produced by a moving vehicle. The load pulse is measured by a load cell with a resolution of 0.1 kPa, and the pavement response is recorded by up to 15 deflection sensors with a resolution of 0.1μm.

The post-processing software (i.e. Dynatest ELMOD- Evaluation of Layer Moduli and Overlay Design) can be used to back-calculate the pavement layer moduli based on the impact load and surface deflection basin. The results can effectively be used for the evaluation of pavement structural conditions and overlay design based on empirical or mechanistic-empirical pavement design guides.

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FFWD Brochure
FFWD Brochure US

Fast Falling Weight Deflectometer video

Watch the video here and see how fast a Fast Falling Weight Deflector really is and what benefits it provides.

Key features and benefits 

  • The Fast Falling Weight Deflectometer (FFWD) is 5 times faster per drop than the Falling Weight Deflectometer
  • No hydraulics
  • Same sensor setup and user interface as with the Falling Weight Deflectometer
  • Passes AASHTO R 32 and the UK Correlation trial
  • 75% more test points per hour or 45% less traffic exposure
  • Lower maintenance cost
  • Ease of training operators and service personnel
  • Consistent data with Dynatest Model 8002 FWD
  • Upgrade capability from Model 8002 FWD to FastFWD

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Fast Falling Weight Deflectometer and Accelerated Pavement Testing

Accelerated Pavement Testing (APT) has since the beginning of the year 1900 helped to create innovation and understanding of pavements during accelerated testing and is one of the valuable tools that can be used to predict and validate performance. The possibility of using the FFWD for in-situ Accelerated Pavement Testing (APT) to study pavement deterioration will shorten the gap between the Heavy Vehicle Simulator (HVS) and small-scale laboratory test methods.

The FastFWD (with an APT application package) has proven to be able to be used as an intermediate tool, between the small-scale laboratory tests (bending beam, shear, and triaxial tests) and full scale accelerated pavement tests. Several tests have been conducted with great success. Read more about this application in the brochure or application note below.

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FastFWD Accelerated Pavement Testing

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New method for in-situ Accelerated Pavement Testing

Watch our video about The Fast Falling Weight Deflectometer in APT

The FastFWD (with an APT application package) has proven to be able to be used as an intermediate tool, between the small-scale laboratory tests (bending beam, shear, and triaxial tests) and full scale accelerated pavement tests. See more in this video.

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