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The PERSUADE project still on track…

Since the kick-off meeting on 28th September 2009, the PERSUADE project has progressed as scheduled. This EU-subsidized project aims at developing the experimental concept of a poroelastic road surfacing (PERS) into a feasible noise-abating measure as an alternative to, for example, noise barriers. Experimental projects in Japan and Sweden have demonstrated that extreme noise reductions can be achieved (up to 12 dB(A)) in comparison with conventional dense asphalt concrete or SMA pavements.

The specific feature of this new type of road surfacing is that it consists mainly of rubber granules from recycled car tyres bound with a synthetic resin, such as polyurethane. However, in the present state of the art its durability remains inadequate. In addition, skid resistance-improving material must be added. Although this has been tried already, long- term performance remains to be verified.

The project programme comprises an extensive investigation in the laboratory to develop a durable mixture, the construction of seven test sections in five partner countries, a monitoring effort for the test sections (noise, rolling resistance, skid resistance, durability, winter behaviour, etc), and a study of all conceivable environmental and economic aspects.

The project has been scheduled for duration of six years and an overall budget of 4.5 million €. Twelve partners from seven European countries are cooperating in this project, including research institutes, universities and companies representing the sectors of industry involved.

In the first year, lots of laboratory work has been carried out to design an optimum mixture. Part of this task is to choose and, if necessary, develop appropriate test methods, as this is a novel type of road surface. The usual lab tests for asphalt samples do not necessarily yield sensible results. Apart from mix design, work has also been done on dissemination and cost/benefit analysis.

The first year of the project also included a training seminar for all involved researchers, intending to exchange all possible information and skills related to the project. Furthermore, a comprehensive state-of-the-art report was produced. 

Laying PERS panels consisting of approx 85 % recycled rubber on street in Stockholm in project run by VTI 2001-2005.	Test section with poroelastic road surface with much lower rubber content, in Zama City, Japan; 2.5 years old when the photo was taken.