Porous concrete road pavements: analysis of noise emissions and applicative implications from the standpoint of both active safety and freeze and thaw cycles resistance

Starting from previous studies carried out by the same Authors, this research is focused on the definition of the optimal mix design of a road pavement made of new draining porous concrete. An accurate experimental investigation performed on different real-scale laying allowed the Authors to assess a series of structural and superficial characteristics of the road pavement above mentioned, so as to appreciate all its positive aspects, the perfectible ones being, in any case, highlighted. In particular, apart from dealing with the mechanical strength of the structural elements against the passage of heavy vehicles and from assessing such parameters as superficial texture, permeability and porosity, the measurements were concentrated on the behavior of the elements themselves in case of very severe winter environmental conditions, with a special interest for freeze and thaw cycles as well as for the use of de-icing salts. Furthermore, a special care was dedicated to the analysis of noise emissions connected with these new pavements, the measurements being taken by means of appropriate apparatus. In addition, the research assessed the advantages from the standpoint of users safety belonging to the utilization of this structural elements: not only the spray, splash, aquaplaning and light reflection phenomena are dramatically reduced, but a significant decrease in the braking distance is observed for both dray and wet conditions. Therefore, thanks to these remarks, the Authors believe that this innovative road pavements, if the perfectible aspects were faced, could be regularly used with positive implications for both users safety and environment protection.