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Effective management must be based on solid structures, which in the case of road infrastructure means the properly selected, implemented system for maintaining the surface. For such a system to be useful, it has to be fed with data of proper quality and accuracy, but above all the data that reflect current, actual state of the road infrastructure. Developed diagnostic techniques can help to ensure these requirements through their efficiency and precision, and relatively low cost of conducting the research. With non-invasive research methods NDT (Non-Destructive Testing) it is possible to obtain in a very short time information about technical condition of the entire road network administered. Radar technique The application of radar technique GPR (Ground Penetrating Radar) in the road research can be divided into four general categories: studies conducted in the design of new roads, testing of existing roads, and receiving checks and tests for management systems.
GPR measurement system In the study of existing roads radar technique is used primarily to determine the layout of structural layers of pavement. Data obtained in this way is very precise and are an important element of the design process of surface reinforcement, it is also an important component of database systems for road maintenance.
Radar research of road section for the needs of road pavement maintenance system More and more GPR studies are performed on newly built roads. In such measurements, especially emphasized are the advantages of radar technique, ie. the measuring of efficiency and accuracy of the data obtained. With this method of measurement the randomness that entails drilling is being eliminated.
Traffic Speed Deflectometer (http://www.greenwood.dk/) The measurement of laser deflectometer TSD is based on advanced laser technology. To measure vertical displacement of the ground surface caused by a moving truck special laser sensors are used. The difference of displacements between that of a laden and unladen point is an expression of the current ground motion caused by a truck of a known load. Using the Doppler technique, it is possible to evaluate pavement surface deflection velocity. In order to obtain optimum conditions of measurement, control systems (inertia system and servomechanism) are used, allowing to monitor the position of laser sensors. Asessment of surface parameters An example of a modern measurement system, using which you can identify almost all the surface parameters is the ARGUS device, by a German company Schniering. In such system, in addition to a set of laser sensors to measure the longitudinal and transverse roughness and texture, the system uses high-resolution cameras, serving to identify surface defects and record the image of a road lane. Identification of defects in such systems involves manual or semi-automatic analysis of the surface image.
ARGUS system by Schniering company. The unmistakable advantages of such devices are their efficiency (the measurement takes place at a speed of 40-60 km/h and can be carried out without hindrances to the road traffic) and high reproducibility and repeatability of results. These features make the measurement systems of this type very useful in the evaluation of pavement for the needs of systems for maintenance and road data banks at the network level. Pavement condition identification Over the past few years the Institute, together with partners, executed several large projects involving the identification and assessment of condition of road surfaces. Within three years, measurements of various surface features had been conducted, on the sections with a total length of just over 2000 km.,and in terms of lanes about 4600 km.
An example profile of elementary data
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The project “The mobile laboratory for the non-destructive pavement characteristics quantification” is financed by The European Regional Development Fund under the Operational Program Innovative Economy.
