Special Issue "Low-Noise Road Surfaces"

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A special issue of Coatings (ISSN 2079-6412).

Deadline for manuscript submissions: closed (29 February 2016)

Special Issue Editor

Guest Editor
Dr. Elisabete Fraga de Freitas

School of Engineering, University of Minho, Campus de Azurém, 4800 058 Guimarães, Portugal
Website | E-Mail
Phone: +351 253510200
Interests: tyre/road interaction; sustainable surface layers; prevision models of traffic noise; comfort-discomfort levels induced by noise from the interaction tyre/road; vehicles detection relevant for road safety

Special Issue Information

Dear Colleagues,

The use of low-noise surfaces is a popular and cost effective way to coat road surfaces aiming at reducing traffic noise and consequently its pernicious effect on people. Porous asphalt and thin layers are traditionally used to reduce noise, because of their high porosity and optimized macrotexture. A few attempts to introduce alternative materials and new techniques have been made, challenging current practices. Also, substantial reductions of tyre–road noise levels are soon expected due to the ongoing research on a new generation of low-noise surfaces—the poroelastic surfaces. Research work on durability, acoustic ageing and acoustic classification of the road surfaces is in constant demand. Impacts with social repercussions, such as safety and annoyance, are also being analysed. The goal of this Special Issue is to present the most promising materials (including cement concrete), techniques and methods under development, to address these research needs and to identify new ones. Further, to promote the use of low-noise surfaces by giving a better insight of the cost/benefit when selecting such a noise mitigating measure and, at the same time, the impact on society.

The interdisciplinary nature of the work calls for cooperation in many fields to provide high performance low-noise surfaces.

Dr. Elisabete F. Freitas
Guest Editor

Submission

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. Papers will be published continuously (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are refereed through a peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Coatings is an international peer-reviewed Open Access quarterly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 300 CHF (Swiss Francs). English correction and/or formatting fees of 250 CHF (Swiss Francs) will be charged in certain cases for those articles accepted for publication that require extensive additional formatting and/or English corrections.


Keywords

  • low-noise road surfaces
  • acoustic ageing
  • durability
  • annoyance
  • traffic detection
  • acoustic characteristics
  • sound absorption
  • texture
  • CPX
  • SPB

Published Papers (5 papers)

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Research

Open AccessArticle The Acoustical Durability of Thin Noise Reducing Asphalt Layers
Coatings 2016, 6(2), 21; doi:10.3390/coatings6020021
Received: 1 April 2016 / Revised: 9 May 2016 / Accepted: 13 May 2016 / Published: 23 May 2016
Cited by 2 | PDF Full-text (11006 KB) | HTML Full-text | XML Full-text
Abstract
Within the context of the European Noise Directive, traffic noise action plans have been established. One of those actions is to deepen the knowledge about low noise roads, as they are considered the most cost-efficient measure for traffic noise abatement. Therefore, ten test
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Within the context of the European Noise Directive, traffic noise action plans have been established. One of those actions is to deepen the knowledge about low noise roads, as they are considered the most cost-efficient measure for traffic noise abatement. Therefore, ten test sections were installed in May 2012 in Belgium, with the objective of integrating Thin noise-reducing Asphalt Layers (TAL) in the Flemish road surface policy in a later stage. Eight test sections are paved with TAL with a thickness of a maximum of 30 mm and a maximum content of accessible voids of 18%. The other two sections consist of a Double-layer Porous Asphalt Concrete (DPAC) and a Stone Mastic Asphalt (SMA-10 as a reference section). The acoustical quality of the asphalt surfaces has been monitored in time using Statistical Pass-By (SPB) and Close-ProXimity (CPX) measurements up to 34 months after construction. Texture measurements performed with a laser profilometer are linked to the noise measurement results. Very promising initial noise reductions were found, up to 6 dB(A), but higher than expected acoustic deterioration rates and the presence of raveling led to noise reductions of a max. of 1 dB(A) after almost three years. It is shown that the construction process itself has a large influence on the acoustical quality over time. Full article
(This article belongs to the Special Issue Low-Noise Road Surfaces)
Open AccessArticle Ultra Low Noise Poroelastic Road Surfaces
Coatings 2016, 6(2), 18; doi:10.3390/coatings6020018
Received: 29 January 2016 / Revised: 7 March 2016 / Accepted: 5 April 2016 / Published: 8 April 2016
PDF Full-text (5993 KB) | HTML Full-text | XML Full-text
Abstract
Noise is one of the most important environmental problems related to road traffic. During the last decades, the noise emitted by the engines and powertrains of vehicles was greatly reduced and tires became a clearly dominant noise source. The article describes the concept
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Noise is one of the most important environmental problems related to road traffic. During the last decades, the noise emitted by the engines and powertrains of vehicles was greatly reduced and tires became a clearly dominant noise source. The article describes the concept of low noise poroelastic road surfaces that are composed of mineral and rubber aggregate bound by polyurethane resin. Those surfaces have a porous structure and are much more flexible than standard asphalt or cement concrete pavements due to high content of rubber aggregate and elastic binder. Measurements performed in several European countries indicate that such surfaces decrease tire/road noise between 7 dB and 12 dB with respect to reference surfaces such as dense asphalt concrete or stone matrix asphalt. Furthermore, poroelastic road surfaces ascertain the rolling resistance of car tires, which is comparable to classic pavements. One of the unforeseen properties of the poroelastic road surfaces is their ability to decrease the risks related to car fires with fuel spills. The article presents the road and laboratory results of noise, rolling resistance, and fire tests performed on a few types of poroelastic road surfaces. Full article
(This article belongs to the Special Issue Low-Noise Road Surfaces)
Open AccessArticle Noisiness of the Surfaces on Low-Speed Roads
Coatings 2016, 6(2), 15; doi:10.3390/coatings6020015
Received: 29 February 2016 / Revised: 17 March 2016 / Accepted: 22 March 2016 / Published: 25 March 2016
PDF Full-text (5892 KB) | HTML Full-text | XML Full-text
Abstract
Traffic noise is a particular threat to the environment in the vicinity of roads. The level of the noise is influenced by traffic density and traffic composition, as well as vehicle speed and the type of surface. The article presents the results of
[...] Read more.
Traffic noise is a particular threat to the environment in the vicinity of roads. The level of the noise is influenced by traffic density and traffic composition, as well as vehicle speed and the type of surface. The article presents the results of studies on tire/road noise from passing vehicles at a speed of 40–80 kph, carried out by using the statistical pass-by method (SPB), on seven surfaces with different characteristics. It has been shown that increasing the speed from 40 kph to 50 kph contributes to the increase in the maximum A-weighted sound pressure level by about 3 dB, regardless of the type of surface. For larger differences in speed (30 kph–40 kph) increase in noise levels reaches values about 10 dB. In the case of higher speeds, this increase is slightly lower. In this article, special attention is paid to the noisiness from surfaces made of porous asphalt concrete (PAC), BBTM (thin asphalt layer), and stone mastic asphalt (SMA) with a maximum aggregate size of 8 mm and 5 mm. It has also been proved that surfaces of porous asphalt concrete, within two years after the commissioning, significantly contribute to a reduction of the maximum level of noise in the streets and roads with lower speed of passing cars. Reduction of the maximum A-weighted sound pressure level of a statistical car traveling at 60 kph reaches values of up to about 6 dB, as compared with the SMA11. Along with the exploitation of the road, air voids in the low-noise surface becomes clogged and acoustic properties of the road decrease to a level similar to standard asphalt. Full article
(This article belongs to the Special Issue Low-Noise Road Surfaces)
Open AccessArticle Performance Assessment of Low-Noise Road Surfaces in the Leopoldo Project: Comparison and Validation of Different Measurement Methods
Coatings 2015, 5(1), 3-25; doi:10.3390/coatings5010003
Received: 12 November 2014 / Accepted: 4 January 2015 / Published: 15 January 2015
Cited by 1 | PDF Full-text (16927 KB) | HTML Full-text | XML Full-text
Abstract
In almost all urban contexts and in many extra-urban conurbations, where road traffic is the main noise pollution source, the use of barriers is not allowed. In these cases, low-noise road surfaces are the most used mitigation action together with traffic flow reduction.
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In almost all urban contexts and in many extra-urban conurbations, where road traffic is the main noise pollution source, the use of barriers is not allowed. In these cases, low-noise road surfaces are the most used mitigation action together with traffic flow reduction. Selecting the optimal surface is only the first problem that the public administration has to face. In the second place, it has to consider the issue of assessing the efficacy of the mitigation action. The purpose of the LEOPOLDO project was to improve the knowledge in the design and the characterization of low-noise road surfaces, producing guidelines helpful to the public administrations. Several experimental road surfaces were tested. Moreover, several measurement methods were implemented aiming to select those that are suitable for a correct assessment of the pavement performances laid as mitigation planning. In this paper, the experience gained in the LEOPOLDO project will be described, focusing on both the measurement methods adopted to assess the performance of a low-noise road surface and the criteria by which the experimental results have to be evaluated, presenting a comparison of the obtained results and their monitoring along time. Full article
(This article belongs to the Special Issue Low-Noise Road Surfaces)
Open AccessArticle Noise Reduction Properties of an Experimental Bituminous Slurry with Crumb Rubber Incorporated by the Dry Process
Coatings 2014, 4(3), 602-613; doi:10.3390/coatings4030602
Received: 12 June 2014 / Revised: 29 July 2014 / Accepted: 1 August 2014 / Published: 11 August 2014
PDF Full-text (7385 KB) | HTML Full-text | XML Full-text
Abstract
Nowadays, cold technology for asphalt pavement in the field of road construction is considered as an alternative solution to conventional procedures from both an economic and environmental point of view. Among these techniques, bituminous slurry surfacing is obtaining an important role due to
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Nowadays, cold technology for asphalt pavement in the field of road construction is considered as an alternative solution to conventional procedures from both an economic and environmental point of view. Among these techniques, bituminous slurry surfacing is obtaining an important role due to the properties of the obtained wearing course. The functional performance of this type of surfaces is directly related to its rough texture. Nevertheless, this parameter has a significant influence on the tire/road noise generation. To reduce this undesirable effect on the sound performance, new designs of elastic bituminous slurries have been developed. Within the FENIX project, this work presents the acoustical characterization of an experimental bituminous slurry with crumb rubber from wasted automobile tires incorporated by the dry process. The obtained results show that, under controlled operational parameters, the close proximity sound levels associated to the experimental slurry are considerably lower than those emitted by a conventional slurry wearing course. However, after one year of supporting traffic loads and different weather conditions, the evaluated bituminous slurry, although it conserves the original noise reduction properties in relation to the conventional one, noticeably increases the generated sound emission. Therefore, it is required to continue improving the design of experimental surfaces in order to enhance its long-term performance. Full article
(This article belongs to the Special Issue Low-Noise Road Surfaces)

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