Structural Testing

Pavement structural testing is required to ascertain pavement strength and therefore performance. When a heavy vehicle drives over a pavement it causes the pavement to momentarily bend. This applies stresses and strains within the pavement structure leading to surface fatigue and / or subgrade deformation.

A Falling Weight Deflectometer (FWD) simulates this by non-destructively dropping a known load to pavement surface.

NZ Road Surveys, Pavement Surveying, Structural Testing
Falling Weight Deflectometer (FWD)

We own and operate a JILS Falling Weight Deflectometer (FWD) which has a standard 300mm diameter load plate able to apply a load up to 120kN. The unit has nine geophone sensors which measure the pavement defection at a specific spacing interval from the load cell.

The raw FWD data can be provided or used to determine:

  • Deflection and curvature results to target geotechnical testing
  • Structural Number (SNP)
  • Layer moduli results based on pavement layer information.
  • Sub-grade CBR
  • Remaining life and pavement designs based on traffic count data.

Structural Testing Brochure

To find the best option that meets your needs, please contact us.