Study of the road surface properties that control the acoustic performance of a rubberised asphalt mixture |
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Authors: | VF Vázquez SE Paje |
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Institution: | University of Castilla-La Mancha (UCLM), Laboratory of Acoustics Applied to Civil Engineering (LA2IC), Avda. Camilo José Cela s/n, 13071 Ciudad Real, Spain |
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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. |
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Keywords: | Crumb rubber Tire/pavement noise Acoustic field evaluation Generation mechanisms |
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