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SilVia - Sustainable Road Surfaces for Traffic Noise Control

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SilVia - Sustainable Road Surfaces for Traffic Noise Control

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Abstract

The overall aim of the project was to provide decision-makers with a tool allowing them to rationally plan traffic noise control measures including low-noise road surfaces. That tool, actually the final output from the project, is a "Guidance Manual for the Implementation of Low-Noise Road Surfaces". It is a compilation of the key research and findings from the entire component Work Packages within the project. The Manual is split into 6 parts. Part 1 summarises the basics about noise in general and vehicle noise and tyre/road noise, in particular, in order to provide the reader with the necessary background to the topic. Part 2 presents an overview of the different low-noise solutions for pavements, including well-established surface types and technologies which are relatively new or under development, some of which have been tested within the SilVia project. It also reviews construction and maintenance techniques used for low-noise surfaces and addresses the possibilities of improving the acoustic performance and durability of low-noise road surfaces. Part 3 first summarises the different measurement methods that are available for the evaluation of the acoustic performance of a road surface, particularly for labelling and conformity-of-production (COP) assessment. The essential chapter in Part 3 is a presentation of the "Noise classification procedure" that has been developed to provide the most accurate and reproducible characterization of the acoustic performance of a specific pavement and could be used in specification and procurement. Part 4 deals with the economic aspects related to the use of low-noise road surfaces. This includes consideration of both safety and sustainability issues. A cost/benefit analysis tool developed as part of this project is also presented. Part 5 considers the interactions that can affect the effectiveness - positively or negatively - of low- noise surfaces. Part 6 presents advice and recommendations derived from the study on how to make the best use of the low-noise solutions for road pavements. They address the decision makers, the road authorities, the contractors and road engineers as well as the policy makers at national and at European level. In addition, a CD-ROM is attached to the Guidance Manual. It includes all main outputs (Deliverables) of SilVia as well as the intermediate technical reports produced by the different Work Packages, plus some other related documents. This is for the reader who is interested in technical details and in the research results underlying the development of the different chapters of the Guidance Manual.

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... No 1222/2009 [21] have been published in order to suggest tyre characteristics that are useful to decrease tyre/road noise. In the meanwhile, the European studies SilVia [22], HARMO-NOISE [23], QCITY [24] and SILENCE [25] focused on actions based on low emission road surfaces, including the methods to evaluate their effectiveness. Results showed that road pavements which incorporate rubber deriving from end-of-life tyres represent an effective solution. ...
Article
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Road traffic in urban contexts produces noise mainly by the interaction of tyres with pavement surface and, therefore, the use of low-noise surfaces represents the best solution since they aim to mitigate the source. Moreover, in urban contexts it is often the only viable solution, together with a careful traffic planning. The main challenge in their adoption as noise mitigation actions is to be able to forecast the acoustical performances that the new road surface will be able to offer. In the UE, the new Green Public Procurement requires experimental verification of noise performance compliance: the designer must declare the acoustical performance of the proposed low-noise pavement and, a few months after the laying, the actual performance of the road surface must be tested using the Close Proximity Method (CPX). Due to the importance of being able to forecast CPX levels, the present work reports a novel way to model CPX broadband levels of newly laid low-noise road surfaces using only data available to the designer before the laying or easily obtained through coring tests, such as grading curve, fractal dimension, asphalt binder content, air voids, voids in mineral aggregates. Two models were elaborated, using two different frequency separations for tyre/road noise. The first model separates low and high frequency contributions, while the second one also considers noise around 1 kHz separately, using a three-band model. Both models are capable of forecasting the acoustic performance of newly laid low-noise road surfaces, using different road mixture parameters at different frequency ranges. The three band model shows a lower RMSE.
... The in the frame work of ISO TC43/SC1/WG33 developed CPX method was found to be in principle adequate for that task.. Although the first experiences with respect to both representativity and reproducibility of the procedure were rather disappointing [2], the modifications made on base of that experience are promising and a final test done in the framework of the SILVIA project [3] will certainly exhibit better results. The related standardised measurement methods based on texture and absorption measurements (ISO 13472 and 13473 series) are helpful in the understanding acoustical characteristics, their role in the functional specification of the noise reducing effect however is limited. ...
Conference Paper
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The development of low noise surfaces is going rapidly and several new types are being produced nowadays. Application of these surfaces in every day road building practice requires the availability of generally accepted test methods to establish the acoustic properties and the be able to control the performance after being produced and during its life time. In this paper we will describe an assessment method for the type approval of acoustic quality of noise reducing road surfaces, closely connected to the noise immission calculation scheme, and we will we will discuss the statistical and methodological aspects and further work on a conformity of production testing and monitoring procedures. Data from seven surfaces will be used as illustration of the method.
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