Indagine sperimentale per la verifica delle potenzialità diagnostiche del LFWD

The note reports on the results of a laboratory and in situ experiment conducted to establsh the diagnostic potentiality of the Light Falling Weight Deflectometer in the field of the road manteinance and construction. In particular, because of the influence of the experiment conditions on the results, the study has preliminary analized the dispersion of the results in relation with the diameter of the and the dynamic load. This analysis, executed on an "open-grade impregnated" (mortar cement), has given the necessary elements to characterize the experiment conditions, has also shown the possibility to use the LFWD to monitor the pavement deterioration, in relation with the repetition of the heavy loads. Afterwards two on site experiment has been developed: the first one finalized to the reliability of a relation between the dinamic flexybility measured with the LFWD and the same parameter obtained with the static load proof, executed on non cohesive soils of pyroclastic origin, the second one with the aim to investigate about the possibility to diagnose the deteriorations of the flexible pavements and their causes, exploring both the dynamic flexibilty by a system of geophones arranged within a 60 m radius from the falling mass, relating the values to what has been detected with a georadar until the level of the subgrade.