Marek Danowski: Maintenance of concrete slabs in Saxony-Anhalt Germany............267
Małgorzata Wutke: Characteristic of geo-radar technology and possible directions for its improviement 276
Marzena Suchocka, Martyna Magdziak: Waterprove pavements as an element supporting sustainable development – eco-development on urban areas ....................... 281
Jakub Salach, Piotr Walas: Intelligent vision control system at traffic lights on intersection.............288
Andrzej Stańczyk: Bridge over Salgina River in eastern Switzerland.............294
Andrzej Stańczyk: Probable reasons for destruction of ‘Polcevero’ viaduct on A10 motorway in Genoa..............296
Marek Danowski: Maintenance of concrete slabs in Saxony-Anhalt Germany. „Drogownictwo”, vol. LXXIII, No. 9, 2018, pp. 267–275
Road administration of German state of Saxony-Anhalt maintains 474 km of motorways, 75% of which are concrete. After a period of intensive expansion of road network, maintenance is now the main task of road administration. After many years. There were problems with durability of concrete pavement of the sections adjacent to asphalt pavement, pavement made with alternative cement and also with repairs due to quite common occurrence of the phenomenon of alkaline reaction with silicic acid (AKR reactions), which led to damage of the pavement. German experience can be used for construction of concrete pavement in Poland.
Keywords: concrete pavement, maintenance, damages, AKR reactions.
Małgorzata Wutke: Characteristic of geo-radar technology and possible directions for its improviement. „Drogownictwo”, vol. LXXIII, No. 9, 2018, pp. 276–280
Ground Penetrating Radar (GPR) technology is widely used for imaging the subsurface areas, including road structures. It is a non-destructive method that uses electromagnetic waves to detect signals reflected from sub-surface constructions. GPR transmits electromagnetic waves to the ground, and when these hit a buried object or boundary of materials with different dielectric parameters, the receiving antenna registers changes in the reflected signal. It is important to have a basic knowledge related to the operation of GPR, because its capabilities, but also limitations are directly correlated with science. The article describes GPR technology with particular attention to the limitations of the methodology. It describes the possibilities of increasing the GPR efficiency and new areas of applications.
Key words: Ground Penetrating Radar, GPR, dielectric constant, reflection coefficient, wave length.
Marzena Suchocka, Martyna Magdziak: Waterprove pavements as an element supporting sustainable development – eco-development on urban areas. „Drogownictwo”, vol. LXXIII, No. 9, 2018, pp. 281–287
Efficient and rational management of resources, specially including water, is the basis for sustainable development. These issues are particularly important on the modern cities areas. The article presents the analysis of water-permeable surfaces and the possibilities of their use as elements of urban infrastructure in order to reduce the surface runoff, improve the site conditions of plants and trees, and improve the quality of life of urban residents. The use of permeable water surface has been analyzed in terms of applying it as one of the good practices of sustainable urban development.
Keywords: porous paving, permeable paving, urban water, sustainable development, ecosystem services.
Jakub Salach, Piotr Walas: Intelligent vision control system at traffic lights on intersection. „Drogownictwo”, vol. LXXIII, No. 9, 2018, pp. 288–293
The main issue presented in this article is creating a vision system, which duty will be to control traffic lights taking into account the traffic flow, types of vehicles and their velocity. The main conception is to have influence on the flexible change of the duration of each signaling phase. It will be proved, on the basis of the measurements, that continuous analysis of the junction through vision system can have better impact on its functioning than analysis through inductive-loop traffic detectors (passing or arriving). The detection methods is compared considering reliability of operation and the impact on the control.
Keywords: vision system, vehicle detection, traffic lights.
Andrzej Stańczyk: Bridge over Salgina River in eastern Switzerland. „Drogownictwo”, vol. LXXIII, No. 9, 2018, pp. 294–296
The development of any discipline has it’s milestones. Salginatobel Bridge is one such milestone in the bridge building development.
Keywords: history of bridge’s building, concrete bridges, Maillart.
Andrzej Stańczyk: The probable cause of the „Polcevero” viaduct’s destruction on A10 motorway in Genoa. „Drogownictwo”, vol. LXXIII, No. 9, 2018, pp. 296, III vol.
The attempt to establish the reason behind the “Polcevero” viaduct disaster in Genoa.
Keywords: bridges, Morandi’s viaduct disaster.