19/03/2024

Measuring thin asphalt layers!

Improved moduli back-calculation of the upper layers in asphalt pavements

Dynatest Senior Pavement Engineer Umberto Pinori has in collaboration with Professor, Eyal Levenberg, from the Technical University of Denmark (DTU) developed a new solution to increase the quality of the bearing capacity evaluation using Falling Weight Deflectometer and Fast Falling Weight Deflectometer.

The study was driven by the need for improved moduli back-calculation of the upper layers in asphalt pavements.

Senior Pavement Engineer Umberto Pinori

Umberto P

The study was presented at TRB in Washington, 8th of January 2024.

Adding an extra geophone!

The improvement was achieved by modifying the Falling Weight Deflectometers design to host an extra geophone at a nontraditional offset of 100mm, i.e., within the loading plate.

Adding an extra geophone at 100 mm from the center of the load, inside the load plate, the deflection basin is collected with more accuracy to improve the back-calculation results.

This new feature will provide significant value for both existing and new Dynatest Falling Weight Deflectometer equipment (applies for FWD and Fast FWD), particularly for users testing thin top asphalt layers or similar materials.

The result showed that the deflection basin is collected with more accuracy to improve the backcalculation results. This new study will be an advantage for existing and new Dynatest Falling Weight Deflectometer users and especially for operators testing thin top asphalt layers or similar.

Plug & play - Upgrade your FWD and Fast FWD

Seamless integration process, making it easy for pavement engineers to measure thinner asphalt pavement layers.


Complete Conversion pack includes:  

  • 1 pcs. Upper loading plate
  • 2 pcs. Quarter plate segment
  • 1 pcs. Geophone 80 or 100mil
  • 1 pcs. Geophone holder
  • 1 pcs. Upper flange for loadcell
  • 1 pcs. Mount Ring for raise-lower Guide

If you are interested in the conversion package and want to start measuring thin asphalt layers today!

Contact us today! 

Contact us

If you want to get an offer on the conversion package and calibration.

Please reach out to us by filling out this form.