In this section the progress and results achieved are depicted through simple graphical tools and tables. Details on activities and deliverables are available in Documents.
Key results obtained according to project’s objectives and expected results
- More than 150 solutions for bituminous mixtures have been analyzed. Then 9 mixtures have been selected according to acoustic response (as built and over time), expected life by referring to mechanistic properties, permeability, friction, satisfactory expected life, ENDt (Estimated Noise Difference Due to Texture) value sufficiently low. Based on additional considerations, 2 mixtures (with and without CR) have been designed for further testing.
For more information click here: Report B1
- A mitigation measure aimed at optimizing road surfaces and tyres of EVs to reduce noise for roads inside very populated urban areas has been developed. Two road surfaces, 5 different EV types, one reference ICE Vehicle (ICEV) and 6 tyre versions per vehicle type (including tyres specifically designed for EVs) have been tested. Specifically, in Nantes two versions (with and without crumb rubber) of the final prototype developed by UNIRC partner have been tested by UNI-EIFFEL partner. Finally, the prototype with crumb rubber has been laid in the pilot case in Florence.
For more information click here: Report B2
- LCPX measurements were carried out during the last year, from October 2021 to October 2022 to assess the behaviour of the pavements right after they were laid and with a significant traffic load. This parameter is measured nearby the contact point between a special reference wheel and the road, essentially evaluating the noise contribution of the road alone, so not including other possible noise sources as the engine or the exhaust pipe. The Green Public Procurement Criteria for Road Design, Construction and Maintenance issued by the European Commission gives some reference value that newly laid pavements have to observe to reflect higher environmental standards that the EU is striving to achieve, firstly to directly benefit its citizens: a 93 dBA reference value is imposed for LCPX road emission at 50 km/h within its first 5 years of duty. The last measurement session gave the following results for the E-VIA pavements: 90.4 dBA (with 1 dBA uncertainty) for the reference pavement and 89.3 dBA (with 0.9 dBA uncertainty) for the special pavements that includes crumb rubber, giving a further environmental advantage in the recycle and reuse of exhausted tyres.
- According to acoustic measurements carried out at receivers roadside about one year after the intervention implementation, a reduction of 4.4 dB(A) in terms of Lnight (in the night period from 10 p.m. to 6 a.m.) has been measured. This benefit affects about 2.000 residents of the pilot area. About 16 months after the pilot intervention realization, a new noise measurement campaign has been carried out in order to verify asphalt performances overtime. Data analysis is ongoing.
- Compared to state-of-the art premium summer tires, the noise optimized tyre for electric vehicles led to a reduction of rolling noise of 0.8 dB(A) under typical urban driving conditions. This was achieved without noticeable impact on other important performances such as rolling resistance, wet grip, or wear. A full performance analysis is still ongoing.
- Regarding the project website, more than 12.000 visits have taken place with more than 2.500 users interacting. Regarding socials, on the Facebook page more than 260 sessions will take place by the end of the project as well as more than 100 sessions on the LinkedIn page. Moreover, 26 scientific papers of which 18 presented during conferences (about 900 people reached) have been published, together with more than 20 brief articles on Italian magazines mainly concerning the pilot case. An overall number of about 60 students has been directly informed about project activities.
For more information click here: Report C1