Abstract
Pavement structural evaluation is mainly carried out using the falling weight deflectometer. Being widely adopted, this test still suffers uncertainties in the interpretation of the results. An alternative procedure, based on high precision 3D measurements of static deflection bowl under real axle load, is described in this paper. The procedure has been developed initially based on synthetic measurements generated using finite element calculations. Initial findings have shown that inverse analysis of the synthetic 3D deflection bowl allows for at least eight constitutive model parameters to be back-calculated with reasonable precision and accuracy. Based on these findings, a new testing device (ETH Delta) has been designed and built at ETH, Zürich. Field and laboratory tests have been carried out in order to validate this technique. A good correlation between the parameters obtained within inverse analysis of the field and those from laboratory tests is found.
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