Expected results

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Expected results

The project is expected to recycle scrap tyres for at least 4000 m of the new surfaces. It is expected to recycle about 2400 kg of rubber from end-of-life tyres for each stretch (400 m) for a total of 24000 kg. In this way about 4800 tyres could be recycled. Further recycled rubber will derive from the use of PERS surfaces for 400 m long stretch which has an even higher percentage of rubber. Moreover recycled asphalts use in 1600 m long stretches will improve waste management and enhance resource efficiency policies. 

The project will allow to reduce the urban noise pollution in the selected sites by at least 5 dB (A) , compared to traditional pavements, and 2 dB (A) compared to the other traditional porous asphalt pavements. This effect will be measured in terms of LDEN and in terms of CPXL indicator (see life performance indicators). This will improve citizens' health in terms of LDEN and therefore DALY indicator: in fact, in Tuscany, it is estimated that actually there are 7000 DALY due to noise and 90% of them are due to road traffic noise. So a decrease of the DALY is expected after the project. The new surfaces will be applied in urban sites where noise limits are exceeded and mitigations are planned so an improvement on people life quality is expected in terms of noise exposure. In fact in Italy, especially in dense urbanized context, the implementation of barriers or windows isolation is not feasible nor effective. In any case, an improvement of sound quality perception is foreseen and it will be evaluated through the about 700 surveys performed. 



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The safety of road surfaces will be tested and an increase in road friction is expected (20%): the Friction Number (F60), British Pendulum Number (BPN) and Transverse Friction Coefficient (CAT) will be determined. 

These pavements will be produced and laid at temperatures of 30-40°C less than temperatures used for crumb rubber modified asphalts, reducing by 30% the emission of polluting vapours of polycyclic aromatic hydrocarbons (PAHs); moreover, these pavements will allow to use reclaimed asphalt pavements in a percentage of 25 - 50%. 5250 m of new experimental surfaces will be laid (5200 m of new low noise surfaces in Italy and 50 m of test surface in Belgium). 

The expected benefit will be evaluated by a Life Cycle Assessment of the used materials and their efficiency by a holistic analysis aiming the evaluation of noise impact on population, including subjective evaluations, psychoacoustical, acoustical and structural properties. An evaluation of air pollution sustainability in the laying of these special surfaces will also be carried out.