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Browsing Conference Proceedings (VTTI) by Author "Anfosso-Lèdèe, Fabienne"
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- A Methodology To Evaluate Pavement Noise Performances For Characterisation, Checking And Monitoring PurposesAnfosso-Lèdèe, Fabienne; Leroux, C. (2012)Over the past decade, road industry developed efficient low noise pavements, providing rolling noise reductions up to 8 dB(A) compared to traditional dense asphalt pavements. With such a progress, road authorities are willing to introduce noise requirements in the tenders for road surface renewal. This implies that a general framework is accepted by both parties, defining the noise performance and describing the procedures to characterise or check it on site. Consequently, the National Working Group for Road Surface Characteristics (GNCDS) was tasked to develop a methodology to evaluate pavement noise performances for characterisation, checking and monitoring purposes. The members of GNCDS belong to public road authorities or institutes and private road companies. In this way, the methodology to be developed should integrate the concerns and possibilities of all stakeholders. In particular, special attention was paid to the difficulties that road contractors often face to reproduce noise performances of a given pavement product from one work site to another, due to unavoidable variations in the properties of aggregates or binder, in the laying process or in local practices. The methodology proposed is based on the method developed within the “SILVIA” EU project, but introduces several adaptations and simplifications to improve the practicability. Noise performance is defined by an absolute pass-by noise level at a reference speed (90 km/h in France). Therefore, the noise characterisation of a pavement is performed by a SPB measurement. At least two different sections on different sites with less than 1.5 dB(A) difference in noise levels, are necessary to define an average noise performance of the pavement product. A CPX measurement is also performed in parallel, to be used as a reference for the checking procedure of other sections of the same type of pavement. The paper will present the methodology developed, the experimental tests performed to check its applicability. Then some successful examples of application of this methodology will be presented.
- Miriam: An International Round Robin Test To Compare Rolling Resistance Measurement MethodsBergiers, Anneleen; Goubert, Luc; Anfosso-Lèdèe, Fabienne; Ejsmont, Jerzy A.; Sandberg, Ulf; Zöller, Marek (2012)The MIRIAM project (Models for rolling resistance in Road Infrastructure Asset Management Systems) was originally established by twelve partners from Europe and USA. It aims at developing methods for improved control of road transport carbon dioxide (CO2) emissions in order to obtain a sustainable and environmentally friendly road infrastructure. The first phase of the project, taking place in 2010-2011, included a round robin test (RRT) to compare different rolling resistance (RR) measurement equipment. The RRT was organized in June 2011 on a test track in Nantes, France. Three institutes participated with their RR trailers. RR measurements were carried out on various surfaces, such as epoxy resin, surface dressings, thin layers, porous cement concrete, porous and dense asphalt concrete. Measurements were carried out at 50 and 80 km/h to assess the influence of speed on RR. A few tyres were used to study the impact of the tyre. Many runs were undertaken on the same surface to gain knowledge about repeatability and reproducibility of the test method. Texture measurements with laser profilometer were performed on the same test sections to investigate the homogeneity of the pavements and to study the relation between texture and RR. In this paper some results, analyses and conclusions of this pilot study are presented.