Abstract
Noise pollution coming from traffic noise has become an important issue in urban areas. Road noise is one of the main sources of high-level traffic noise. Road noise depends not only on tires but on the pavement. Therefore, a study of mixture parameters should be performed to achieve good acoustic performance. Another important point which has to be taken into account is the acoustic performance durability. Gap-graded mixtures were selected for this project due to poor experiences with open-graded mixtures in terms of performance durability, where texture and clogging issues appeared a few years after paving. The LIFE SOUNDLESS project is seeking different ways to modify stone mastic asphalt mixes to improve the noise attenuation of pavements. A selection of mixes with different additives were created, where some waste materials were used. The selection of the best mixtures was done not only according to traditional mechanical parameters but also others, such as damping and dynamic stiffness. Once the best mixtures had been paved, the acoustic performances were measured several times to evaluate the performance durability. Several experimental methods like the close proximity (CPX) method and statistical pass by (SPB) method were used to check the sound generation and propagation of every pavement. The project was carried out on two roads overseen by the Junta de Andalucía in Seville (Spain). The difference between both roads was the traffic density and the average speed. The noise level has since been reduced by 3 dB and 7 dB on both sites.
Highlights
In 2002, the European administration established the need for noise maps and action plans for all owners of roads, railways, and airports to reduce noise pollution [1]
The results showed that the addition of these recycled materials increases the toughness of the stone mastic asphalt (SMA)
Practicò, F. et al introduce a new generation of SMA developed with a maximum aggregate size of 5 or 6 mm, and 100% crushed materials that are very cubical with good polish resistance values, with the presence of fibers in the mix and polymers or powdered crumb rubber
Summary
In 2002, the European administration established the need for noise maps and action plans for all owners of roads, railways, and airports to reduce noise pollution [1]. Practicò, F. et al introduce a new generation of SMA developed with a maximum aggregate size of 5 or 6 mm, and 100% crushed materials that are very cubical with good polish resistance values, with the presence of fibers in the mix and polymers or powdered crumb rubber. This new generation of SMAs has air void contents between 5% and 10%, which is much higher than conventional SMAs [21]. According to the Eiffage Infraestructuras experience in the Spanish project “Proyecto SMA” [23], the use of nylon fiber, tire rubber, and/or recycled plastic can improve the properties of SMA pavements. The rate conforming to the logarithmic model was a better fit to the experimental data measured
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
