Porous top layer optimization of cement concrete slabs for tyre/road noise reduction
Résumé
The I-STREET CUD-SF project aims at developing an urban pavement made of cement concrete
slabs that can be easily removed and replaced for maintenance purposes. These slabs are made of a
dense cement concrete body and a functionalized porous top layer ensuring water drainage and
sound absorption. In order to optimize the porous layer for the reduction of tyre/road noise, several
mix recipes with different porosities and maximum aggregate sizes were considered. The recipes with
the most interesting absorption properties were preliminary selected based on absorption coefficient
measurements performed on cylindrical test specimens with an impedance tube. A second phase was
dedicated to the evaluation of texture induced coast-by rolling noise levels with the tyre/road noise
prediction model HyRoNE from 3D texture scans performed on rectangular laboratory samples. Finally,
based on a porous medium model and a propagation model considering the tyre/road noise