Please use this identifier to cite or link to this item:
https://hdl.handle.net/10216/85528
Author(s): | José Dias Rodrigues Elisabete Freitas Jorge Araújo Hugo Silva |
Title: | Innovative low noise surfaces - comparison of damping and absorption |
Issue Date: | 2014-11-16 |
Abstract: | While sound absorption is an acoustic related property reasonably well known and currently used tocharacterize low noise surfaces, damping is a property commonly used in other domains to define the energydissipation of a material but rarely used to characterize this important mechanism in road pavements. Thispaper compares noise related properties such as damping and absorption of five road pavement surfaces. Twoof 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-densitypolyethylene 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 in30x30 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 slabswas analysed. Results show that the innovative surfaces have better acoustic related properties while thesurface with high-density polyethylene provided the worst results. Furthermore, a strong correlation ofdamping and air voids was found. |
URI: | https://repositorio-aberto.up.pt/handle/10216/85528 |
Source: | Proceedings of 43rd International Congre ss on Noise Control Engineering - inter.noise 2014 |
Document Type: | Artigo em Livro de Atas de Conferência Internacional |
Rights: | openAccess |
License: | https://creativecommons.org/licenses/by-nc/4.0/ |
Appears in Collections: | FEUP - Artigo em Livro de Atas de Conferência Internacional |
Files in This Item:
File | Description | Size | Format | |
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145991.pdf | 176 kB | Adobe PDF | View/Open |
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