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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
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.

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.

De Cauwer B.,Ghent University | Fagot M.,Ghent University | Beeldens A.,Belgian Road Research Center | Boonen E.,Belgian Road Research Center | And 2 more authors.
Weed Research | Year: 2014

Summary: The recent phaseout of herbicide use on public pavements in Flanders has triggered the development of alternative weed control strategies. Besides the search for effective non-chemical curative methods, there is also a need for strategies that prevent or reduce weed growth on pavements. In this study a paving experiment was set up under a rain shelter to investigate the effects of four construction factors on weed growth: joint filling material, joint width, organic pollution of the joint filling material and type of bedding layer. Paving mini-plots were oversown with a mixture of dominant, hard-to-control weed species found on pavements. The inhibitory effect on weeds was determined by examining initial weed density and weed coverage over a 2-year period. More weed growth was found in pavings with wide joints and organically polluted joint filling materials. High permeability of the bedding layer resulted in higher weed cover. The coarse-grained filling materials and the sodium silicate-enriched sand Dansand® were associated with less weed cover than the fine-grained filling materials. Our results show there is potential for preventing weed growth using suitable paving materials and appropriate high-standard construction and maintenance of pavements. © 2013 European Weed Research Society.

De Cauwer B.,Ghent University | Fagot M.,Ghent University | Beeldens A.,Belgian Road Research Center | Boonen E.,Belgian Road Research Center | And 2 more authors.
Weed Research | Year: 2014

Summary: Reduction in herbicide use in non-agricultural areas is being imposed by a growing number of governments, triggering the development of alternative strategies for weed prevention and control. This study aimed to determine the weed preventive abilities of different paving types, the required treatment frequency of non-chemical weed control scenarios on these pavements and the associated weed species composition. A test parking area, constructed with four concrete paving types, was sown with a mixture of dominant weed species. Six scenarios with repeated use of a single weed control method (brushing with waste removal, hot air, selective application of hot water and three scenarios with flaming) and two scenarios with alternating use of brushes and hot air were applied to control the weeds during two growing seasons. Treatments were applied at well-defined intervention moments, based upon weed development. Over 2 years, the paving types differed in weed coverage (up to a fourfold difference) and required varying treatment frequency (up to a 11-fold difference) with lowest values for pavings with porous pavers. Within most paving types, up to 28% lower treatment frequencies were found for selective application of hot water, as compared with all other single method scenarios. Shifts in weed composition occurred in plots treated repeatedly with the same technique. Paving type determined the chances for the establishment of different weed species and alternating non-chemical control methods with different modes of action offered the best opportunity to keep weeds under control. © 2013 European Weed Research Society.

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