Porous road surfaces have interesting properties for road safety and noise reduction. However, these properties can change signi ficantly over time, due to weather conditions and clogging, until they are the same as usual road surfaces. The aim of this PhD work is to set up the scientifi c tools needed for the in situ evaluation of the parameters related to the microstructure of the porous road surface by a non-destructive acoustic method. The methods for measuring in situ the surface impedance and the absorption coeffi cient are investigated. Three of these methods are compared on a polymeric foam and a pervious bituminous concrete. Moreover, propagation and dissipation phenomena in this porous medium are described ; it leads to the models relating the acoustic quantities (including the surface impedance and the absorption coeffi cient) to the intrinsic material parameters. Among them, a model is chosen which complies with the physical problem and requires only three parameters. A analysis of the sensitivity of this model to its parameters is performed, leading to the development of a guided model inversion procedure. From the quantities measured in situ, this procedure allows to estimate each parameter in turn in targeted frequency ranges regarding their in fluence on the outputs of the model. This procedure is validated on samples of porous road surface and gives relevant results on in situ measurements. Lastly, the elaborated tools are applied to the clogging issue. The experimental set-up allows to highlight the e ffect of clogging on the acoustical quantities and on the parameters related to the material microstructure.
