Browsing by Author "Goubert, Luc"

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    About The Reproducibility Of Texture Profiles And The Problem Of Spikes
    Goubert, Luc; Bergiers, Anneleen (2012)
    The ISO working group ISO/TC43/SC1/WG39 has recently been worrying about the quality of texture profiles, measured with laser profilometers. It appears that the quality has not improved in recent years, rather on the contrary: in spite of the technological progress it appears to decrease! The WG is especially concerned of the presence of invalid positive spikes in some profiles which might dramatically affect the Mean Profile Depths (MPD) [1] and to some extent the texture spectra calculated with those spectra, if one does not properly deal with these erroneous measurement points prior to calculating the MPD or spectrum. In this paper the results of an international round robin test with static laser profilometer devices on two epoxy moulds of dense asphalt concrete road surfaces are shown, indicating the reproducibility of this kind of devices for the wavelength range from 2,5 mm up to 125 mm. A new procedure to deal with the spike problem is presented. The aim is to remove the spikes without affecting significantly the valid part of the spectra. The effect on MPD and spectra will be shown for some typical cases. The method, based on the detection of steep jumps in the profile, appears to work.
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    About The Rolling Resistance Trailer And Parameters Influencing Rolling Resistance
    Bergiers, Anneleen; Goubert, Luc; Vuye, Cedric (2012)
    The issue of global warming by an excessive amount of carbon dioxide (CO2) in the atmosphere is a hot topic and the consequences for man and environment become more and more clear. Road transportation plays a significant role in CO2 emission and unlike other sectors, its emission has even increased the last years. To stop this trend, different measures may be taken: e.g. tackling traffic congestion, lowering the consumption of the vehicles… Many other parameters influence CO2 emission by transportation: e.g. tyre, vehicle and road characteristics… In this paper the influence of the road surface is investigated with a “quarter-car” trailer, suitable to measure rolling resistance with a car tyre on different road surface types. Texture measurements with a laser profilometer are performed to examine the correlation between rolling resistance and texture. The impacts of different parameters are investigated: repeatability over short and long time, speed, wind, tyre inflation pressure, tyre load, tyre type … Some rough coast down measurements are performed to compare with the trailer method. By gaining more knowledge about this topic, more environmental friendly and sustainable road infrastructure may be developed and implemented. This is expected to be an important tool for policy makers in their fight against CO2 emission.
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    Miriam: An International Round Robin Test To Compare Rolling Resistance Measurement Methods
    Bergiers, 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.