Belgian Road Research Center

Brussels, Belgium

Belgian Road Research Center

Brussels, Belgium
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Destree A.,Belgian Road Research Center | De Visscher J.,Belgian Road Research Center
European Journal of Environmental and Civil Engineering | Year: 2017

The intrinsic characteristics of tack coats play an important role in the adhesion between layers, but the conditions of application of these coats are equally crucial. In this context, the BRRC actively participates in a Belgian working group on tack coats and the objective is to carry out a “field” study about adhesion between layers while evaluating the influence of different parameters– such as type and rate of spread of tack coat, nature and preparation of the binder course, etc. With a view to this objective, a test site was constructed consisting of four test sections differing in type of tack coat, texture due to milling speed and cleaning operation of the binder course. The bond strengths were investigated by direct shear tests performed in the laboratory on specimens taken from the four test sections. This paper describes the conditions of application, the measurements made on site and the results of the interlayer adhesion test. The test sections were constructed in good conditions, leading to high shear strength values. Only the effect of tack coat type could be demonstrated, while for all milling speeds and cleaning operations considered in this study, the results were equally good and not significantly different. © 2017 Informa UK Limited, trading as Taylor & Francis Group

De Visscher J.,Belgian Road Research Center | Vanelstraete A.,Belgian Road Research Center
International Journal of Pavement Research and Technology | Year: 2017

The use of new types of asphalt mixtures for thin to very thin surface courses is seen as a cost-effective solution for reducing traffic noise in Belgium. However, ravelling is a major concern for this type of mixtures and there is a need for a standardized laboratory test to predict resistance to ravelling caused by shear forces (also known as “scuffing”). The Belgian Road Research Centre (BRRC) uses the Darmstadt Scuffing Device, an apparatus developed in Germany for testing porous asphalt. This paper describes the experience of BRRC with this test device. As a first step, it was verified whether the test is capable of discriminating between mixtures other than porous asphalt, the mixture type for which the apparatus was originally designed. The second step was to verify if the ranking of mixtures is in agreement with the observations on the road. Therefore, the test was applied to mixtures from different test sections that are being monitored at regular times, a work that will be continued in the coming years. While this work is going on, CEN TC 227 WG1/TG2 is in the process of drafting a European standard for the scuffing test (prCEN/TS 12697-50). The results of this research will be used to contribute to the development of a standard European test method. © 2017 Chinese Society of Pavement Engineering

Maeck J.,Belgian Road Research Center | Bergiers A.,Belgian Road Research Center
Proceedings of the INTER-NOISE 2016 - 45th International Congress and Exposition on Noise Control Engineering: Towards a Quieter Future | Year: 2016

The City of Antwerp has initiated a pilot project on thin noise reducing asphalt layers in an urban environment. The aim is to investigate the behaviour of the asphalt layers from a noise perspective with respect to urban (lower speed) traffic without neglecting the mechanical durability. Five thin asphalt layers are selected, and compared with a reference section. The laying has been followed extensively by visual inspection and surface and internal temperature measurements during laying and compaction. Sampling of bulk materials of the distinct sections serves for a granulometry check and laboratory ravelling tests on sample specimens. Periodically the test sections are monitored by texture, CPX and rolling resistance measurements. At the acoustically best performing test sections, an initial reduction of 4 up to 5 dB(A) is detected by the CPX method using P1 tyre at 50 km/h. Also lower MPD and rolling resistance values are measured on the thin asphalt layers. The major concern in the STOLA project is to learn about a good balance between the noise reducing capacity of the chosen thin asphalt layers, a limited degradation of the noise performance during its lifetime and a good mechanical performance delaying ravelling and texture changes as long as possible. © 2016, German Acoustical Society (DEGA). All rights reserved.

Bergiers A.,Belgian Road Research Center | Maeck J.,Belgian Road Research Center
Proceedings of the INTER-NOISE 2016 - 45th International Congress and Exposition on Noise Control Engineering: Towards a Quieter Future | Year: 2016

In the ROSANNE project (acronym for "ROlling resistance, Skid resistance, ANd Noise Emission measurement standards for road surfaces") Work Package four deals with texture influence, reference tyres and surfaces. One objective is to study the performance of various reference tyres, to ascertain their reproducibility and stability over time. In the light of the ongoing writing of ISO/TS 11819-3 regarding reference tyres, research was performed to fill up some gaps. CPX measurements were repeated with new P1 and H1 tyres at various kilometers run-in on 10 road surfaces to verify the influence of run-in. Additionally measurements were performed with three sets of P1 tyres on these 10 road surfaces to verify the reproducibility. Influence of mounting direction of new P1 tyres was verified on a porous mastic asphalt to supplement available research. Work Package two deals with measurement methods for noise emission properties. One task is temperature influence and correction. In the frame of the ongoing writing of ISO/TS 13471-1 about temperature correction for CPX method, a measurement campaign was done on a poroelastic road surface. 24 measurements were performed with P1 tyre with air temperature range from 9 to 22°C. © 2016, German Acoustical Society (DEGA). All rights reserved.

Cesbron J.,LUNAM University | Bergiers A.,Belgian Road Research Center
Proceedings of the INTER-NOISE 2016 - 45th International Congress and Exposition on Noise Control Engineering: Towards a Quieter Future | Year: 2016

During the European PERSUADE project, a full scale test section with a poroelastic road surface (PERS) has been built on a road with regular traffic in Herzele in Belgium. The acoustical performance of the PERS test section has been monitored during ten months. SPB, CPB and CPX measurements were performed and showed no significant deterioration of the acoustical properties over time. The noise reduction was remarkable. Noise reductions up to 9 dBA were measured in comparison with an old asphalt concrete at the reference speed of 50 km/h. Several road properties influencing tyre/road noise have also been measured in situ. Mean Profil Depth (MPD) and road texture spectra were assessed from texture measurements with a dynamic laser profilometer. Sound absorption was measured following ISO13472-1 and appeared to be relatively low for a porous road surface. Mechanical impedance of the road surface was also measured using a specific impact method. Thus, the dynamic Young modulus of the road surface was estimated using a single degree of freedom approach. The stiffness was relatively high for a PERS but much less than a traditional asphalt concrete, having a good potential for reduction of tyre/road interaction via the elasticity of the road surface. © 2016, German Acoustical Society (DEGA). All rights reserved.

Goubert L.,Belgian Road Research Center
INTERNOISE 2014 - 43rd International Congress on Noise Control Engineering: Improving the World Through Noise Control | Year: 2014

Affordable and effective traffic noise mitigation measures are highly wanted, e.g. for the "action plans" which are due for the European Noise Directive in the EU MS. Low noise pavements are an interesting option as they are a "source measure" and relatively cheap compared to other measures. The problem with the conventional low noise pavements is that the obtained noise reduction (typical 2 to 7 dBA) is lower than what can be achieved with noise barriers (typical 7 up to 12 dBA). A poroelastic road surface (PERS), consisting of a significant amount of rubber and bound with an elastic polymer, such as polyurethane, has proven to be capable of reducing the tyre/road noise with 8 to 12 dBA. A limited durability was one of the major obstacles for its use. Since 2009 a consortium of twelve EU partners is working on the development of a useable type of PERS in the EU funded PERSUADE project. All relevant aspects are being considered and for all remaining problems one tried to find a solution. Mixes which at least perform well in the laboratory have been found and these are currently tested on road test tracks. This paper summarizes the current project status.

Bergiers A.,Belgian Road Research Center
18th International Congress on Sound and Vibration 2011, ICSV 2011 | Year: 2011

The ongoing revision of ISO standard 11819-1 "Statistical Pass-By (SPB) method", requires detailed information about its variant for built up areas, the so called backing board (BB) method. The latter method comprises the installation of a solid board behind the microphone during the measurements, protecting the microphone against noise from behind (for example reflections by facades). The noise coming from the front is reflected by the backing board in a controlled way, so that it can be taken into account afterwards. In theory the sound pressure level rises with 6 dB(A), corresponding to a doubling of the sound pressure. Different experiments confirm this value for light vehicles as long as only the overall level is considered and not the spectral analysis of the sound. However, as the SPB method is a time consuming method and heavy vehicles are rather scarce at most test locations fulfilling all measurement method requirements, during previous research not enough heavy vehicles have been measured to be able to confirm this value for heavy traffic. Therefore SPB measurements with backing board have been performed on different test locations in Belgium, focused on heavy traffic. In this paper the results of these measurements are presented. Copyright © (2011) by the International Institute of Acoustics & Vibration.

Goubert L.,Belgian Road Research Center | Sandberg U.,Swedish Road and Transport Research Institute
ICSV 2016 - 23rd International Congress on Sound and Vibration: From Ancient to Modern Acoustics | Year: 2016

A poroelastic road surface (PERS) consists of rubber granulates and stone aggregates, bound with an elastic resin, such as polyurethane. It does not contain bitumen. Thanks to its elasticity, porosity and texture, it is capable of yielding an unequalled noise reduction, typically 8 - 12 dB(A) with respect to reference dense asphalt concrete. Although already invented in 1979, some persistent problems, the most important being as durability, prevented the use of it for noise abatement. In 2009 the six year EU funded project PERSUADE started, aiming to develop a highly noise reducing, safe and affordable PERS with an acceptable durability. The approach of the PERSUADE consortium was at the same time holistic (all aspects of PERS were studied) and step-wise. It started with laboratory testing of mixes and adhesion to the sub layer. Then small scale pilot test tracks were constructed on parking lots and consequently full scale test tracks on real roads. An extensive monitoring program extracted as much as possible information from the test tracks. Many other relevant aspects, such as cost-benefit, fire safety, toxicity, sustainability, etc were thoroughly studied. This contribution outlines all the findings of the project and makes clear how one go further with this technology.

Boonen E.,Belgian Road Research Center | Beeldens A.,Belgian Road Research Center
European Transport Research Review | Year: 2013

Purpose: This paper gives an overview of our research on photocatalytic concrete, which exhibits air purifying properties. Under the action of sunlight, a catalyst present at the surface of the material is activated, enabling degradation of pollutants from the surroundings and transformation to less harmful products. It is a promising technique to reduce a number of air contaminants, especially at sites with a high level of pollution: highly trafficked canyon streets, road tunnels, etc. In addition, the combination with cement offers some synergistic advantages, as the reaction products can be adsorbed at the surface and subsequently washed away by rain. However, the great potential of this emerging technology is hampered by the lack of uniform testing methods at European level to evaluate the photocatalytic activity. Methods: Laboratory research is undertaken at BRRC to compare existing methods and draw up recommendations for future standards. Furthermore, translation of lab testing towards results in situ remains critical to demonstrate the effectiveness on larger scale. In this perspective, several trial applications have recently been initiated in Belgium to asses the "real life" behavior. Results: The paper gives a short overview of the photocatalytic principle and the application in concrete, as well as some main results of the laboratory research recognizing the important parameters that come into play. In addition, the implementation efforts of some recent realizations in Belgium will be presented. Conclusions: Already some very promising results towards air purification have been obtained. Nevertheless, further validation, also with modeling, is necessary to extrapolate the findings and enable a judicial implementation of photocatalytic road materials across the globe. © 2012 The Author(s).

Sandberg U.,Swedish Road and Transport Research Institute | Goubert L.,Belgian Road Research Center
40th International Congress and Exposition on Noise Control Engineering 2011, INTER-NOISE 2011 | Year: 2011

The PERSUADE (PoroElastic Road SUrface for Avoiding Damage to the Environment) project started as an EU funded project aiming at further development of the poroelastic road surface (PERS). It has been shown in previous experiments in Sweden and Japan that this experimental type of pavement, made of rubber granules and stone or sand aggregates, bound with a flexible polymer like polyurethane, is capable of reducing tire/road noise by up to 12 dB(A) for cars. This is a higher reduction than any other type of surfacing has offered. In this paper, the main problems (such as limited raveling resistance, adhesion to the sub layer and decreasing skid resistance) will be discussed as well as the strategy how the project consortium will try to solve them. The potential usefulness of the new pavement will also be discussed. The paper will include a chapter in which the economical feasibility of PERS is studied. It is obvious that this type of road surface is much more expensive than even the most costly "conventional" noise reducing pavements. Nevertheless, research carried out within the framework of PERSUADE has shown that PERS can be a cost effective noise abatement measure in certain applications, even with a limited lifetime. Copyright © (2011) by the Institute of Noise Control Engineering.

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