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TitleInnovative low noise surfaces : comparison of damping and absorption
Author(s)Freitas, Elisabete F.
Rodrigues, José Dias
Rocha, Jorge de Araújo
Silva, Hugo Manuel Ribeiro Dias da
Damping ratio
Tyre-road noise
Voids percentage
Issue dateNov-2014
PublisherAustralian Acoustical Society (AAS)
CitationFreitas E. F., Dias Rodrigues J., Araújo J., Silva H. M. R. D. Innovative low noise surfaces – comparison of damping and absorption, Inter.noise 2014, 43rd International Congress on Noise Control Engineering, 2014
Abstract(s)While sound absorption is an acoustic related property reasonably well known and currently used to characterize low noise surfaces, damping is a property commonly used in other domains to define the energy dissipation of a material but rarely used to characterize this important mechanism in road pavements. This paper compares noise related properties such as damping and absorption of five road pavement surfaces. Two of which are innovative and therefore expected to be low noise since they have high voids content, incorporate fine grading aggregates and expanded clay. Other two incorporate rubber and waste high-density polyethylene giving them an elastic and stiff behaviour respectively. The fifth is a conventional material, asphalt concrete, used for control. Sound absorption tests and mechanical impedance tests were carried out in 30x30 cm slabs at 20ºC. To measure absorption, an impedance tube with an open end was put on the surfaces. To determine damping, the response of a hammer impact measured by an accelerometer on suspended slabs was analysed. Results show that the innovative surfaces have better acoustic related properties while the surface with high-density polyethylene provided the worst results. Furthermore, a strong correlation of damping and air voids was found.
Appears in Collections:C-TAC - Comunicações a Conferências Internacionais

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