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Falling Weight Deflectometer (FWD)

The Dynatest Falling Weight Deflectometer (FWD) applies a dynamic load that simulates the loading of a moving wheel. 


The pavement response is analyzed with Dynatest's ELMOD (Evaluation of Layer Moduli and Overlay Design) software to determine the elastic moduli, stresses and strains of each modeled layer. ELMOD reports the weakest layer of failure, residual life and determines the optimum rehabilitation alternatives. The FWD is available as a trailer or a truck mounted version (USA only) meeting all FWD standards worldwide.


1. Automated and rapid structural pavement testing applicable to pavements all over the world
2. Determines the layer of failure, rather than simply determining the bearing capacity
3. QA/QC of newly built pavements
4. Compares a range of rehabilitation options, including plane off and recycling rather than just applying overlays
5. The use of the FWD provides accurate, reproducible and repeatable structural data
6. Automated and real-time monitoring of the load cell, geophones, and data variations ensures high quality of collected data
7. Uses mechanistic-empirical analysis applicable to most of pavement structures