Study of the road surface properties that control the acoustic performance of a rubberised asphalt mixture. (15th January 2016)

• Record Type: Journal Article
• Authors: Vázquez, V.F.; Paje, S.E.
• Is Part Of: Applied acoustics. Volume 102(2016)
• Page Start: 33
• Page End: 39
• Publication Date: 2016-01-15
• Subjects: Crumb rubber -- Tire/pavement noise -- Acoustic field evaluation -- Generation mechanisms; Acoustical engineering -- Periodicals; Periodicals; 620.2
• DOI: 10.1016/j.apacoust.2015.09.008
• Languages: English
• ISSNs: 0003-682X

Abstract

Graphical abstract: Highlights: A test track constructed with and without crumb tire rubber was assessed. A high content of crumb rubber was added to the mixture by wet process. Dynamic stiffness of the mixtures was measured in in - situ conditions. Dynamic stiffness influence on tyre/pavement noise is not significant. Abstract: Simultaneously with the fact that vehicle industry has been able to lower the noise emission from driving vehicles, tire/pavement noise has become the most significant source of traffic noise. In order to reduce it, low noise surfaces are seen as a practical solution. One of these types of surfaces may be elaborated with bituminous mixtures with crumb tire rubber added to the binder in high content by a wet process. However, the generation mechanisms involved in the tire/pavement sound and the reasons of the noise attenuation achieved with these mixtures are not so clear. This study analyses the different generation mechanisms that take place in the tire/pavement sound generation in these crumb tire rubber pavements. The surface properties of the in-service pavement, which are most important in controlling the acoustic performance (texture, acoustic absorption and dynamic stiffness or mechanical impedance), have been measured for the characterization of a test track constructed with and without crumb tire rubber. After results correlation of these surface characteristics in a pavement with crumb tire rubber added by a wet process, it seems that the parameters of roughness and texture could have a relevant role in the global tire/pavement sound emission, whereas dynamic stiffness influence is relatively minor.