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Prediction of road surface skid resistance in laboratory
Nekulová, Pavla ; Dašek, Ondřej (referee) ; Stryk, Josef (referee) ; Varaus, Michal (advisor)
The dissertation deals with a testing method described in ČSN EN 12697-49 (also known as Wehner/Schulze), which aims to predict the evolution of skid resistance properties of road surfaces using laboratory testing. Given that the required quality of skid resistance on road surfaces must be met not only for new constructions but also at the end of the warranty period, contractors of transportation structures have started focusing on the lifespan of road skid resistance properties. Although the Wehner/Schulze test was introduced in the 1960s, increased attention has been given to it only in the last fifteen years. The fundamental prerequisite for utilizing this testing method is linking the measurement results in the laboratory to values measured by dynamic measuring devices, commonly used for monitoring the skid resistance of road surfaces. This involves establishing a relationship between laboratory simulation of traffic and actual traffic load. The final step involves employing the Wehner/Schulze testing method to design special asphalt mixtures with optimal longevity of skid resistance properties. In this case, it entails an asphalt mixture with a combination of aggregates with different PSV values to utilize local aggregates with low PSV values, supplemented with a small quantity of high-quality imported aggregates with high PSV values.
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New trends in pavement maintenance
Březina, Ilja ; Stryk, Josef (referee) ; Hýzl, Petr (advisor)
The diploma thesis is dealing with the topic of new trends in asphalt road routine maintenance with a focus on new possibilities to repair damaged road surface, especially potholes and cracks. In the diploma thesis, a new advice which uses microwave heating in resurfacing asphalt roads was developed with the aim to observe its effectiveness and the optimal repair time. The obtained results were consulted with the producer of the equipment in order to utilize this new technology for repairing potholes and cracks on asphalt road surface in standard practice.
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Application of thermography in the diagnostics of transport infrastructure objects
Janků, Michal ; Stryk, Josef
In order to maintain the proper condition of buildings, bridges, roads and other structures, their regular maintenance is essential. Often, if the distress is detected at the beginning of the disorder, the cost of removing it is far lower than after months of uncontrolled degradation. Locating a distress in time, often means detecting it before it is visible to the naked eye. A key means of detecting hidden distresses is non-destructive diagnostic methods (NDT), including thermographic testing. The purpose of the presented methodology is to provide an efficient tool that will allow a rapid assessment of the state of the transport infrastructure objects and help with the identification of the locations where visual inspection or detailed diagnosis is required. The thermographic measurement is non-contact and can be carried out without the need to exclude traffic on the road. The methodology describes possible ways of using infrared thermography, especially in diagnosis of bridges, roads and tunnels. The presented methodology was prepared within project TE01020168 - Centre for Effective and Sustainable Transport Infrastructure (CESTI), with financial support of the Czech Technology Agency within the Centre of Competence Program. This methodology is intended for road managers at all levels (state, county, city), designers, construction companies and other entities that can use data and processed outputs from thermographic measurements.
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Evaluation of pavement condition by combination of FWD device and ground penetrating radar
Stryk, Josef ; Březina, Ilja ; Matula, Radek ; Grošek, Jiří ; Janků, Michal
The combination of two non-destructive diagnostic devices – the Falling Weight Deflectometer (FWD) used to assess the bearing capacity of pavements and the Ground Penetrating Radar (GPR) used to determine the thickness of structural layers, to identify inhomogeneities, hidden defects and failures are increasingly being used in pavement diagnostics. The purpose of the methodology is to specify the procedure for performing measurements of combinations of these two devices, in the context of conducting a diagnostic survey of pavements. It draws attention to the benefits of processing data measured by both devices and their use in creating homogeneous sections, which serve as a basis for planning of maintenance, repair and reconstruction of roads. The presented methodology was prepared within project TE01020168 – Centre for Effective and Sustainable Transport Infrastructure (CESTI), with state support of the Czech Technology Agency within the Centre of Competence Program. This methodology is intended primarily for companies dealing with pavement diagnostic surveys
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Geocomposite drainage for the purpose of drainage on transport infrastructure objects
Macan, Tomáš ; Zedník, Petr ; Stryk, Josef ; Vodáček, Ondřej ; Kašpar, Martin ; Hubík, Petr
This methodology describes in detail the design, dimensioning and application of geocomposite drainage for the purpose of drainage on transport infrastructure objects. In addition to conventional systems, such as drainage layers made up of unbound, permeable materials, geocomposites are increasingly encountered on construction sites. Drainage geocomposite is a geosynthetic with drainage function, able to drain water in the plane in which it is installed for this purpose due to its composite structure. It consists of a drainage core and core protection. Very little space is devoted to drainage geocomposites in Czech standards and technical regulations. Therefore, this methodology deals in more detail with the design and application of drainage geocomposites, summarizes knowledge and procedures from various, mainly foreign, sources and is intended to help their wider and technically correct use in practice. It gives details, sample sheets and specific examples of implementation that supplement the information given in the technical regulations for drainage. The methodology was prepared within project TE01020168 - Centre for Effective and Sustainable Transport Infrastructure (CESTI), with state support of the Czech Technology Agency within the Centre of Competence Program. This methodology is intended primarily for the transport infrastructure owners and administrators, designers and contractors of transport infrastructure objects.
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New trends in pavement maintenance
Březina, Ilja ; Stryk, Josef (referee) ; Hýzl, Petr (advisor)
The diploma thesis is dealing with the topic of new trends in asphalt road routine maintenance with a focus on new possibilities to repair damaged road surface, especially potholes and cracks. In the diploma thesis, a new advice which uses microwave heating in resurfacing asphalt roads was developed with the aim to observe its effectiveness and the optimal repair time. The obtained results were consulted with the producer of the equipment in order to utilize this new technology for repairing potholes and cracks on asphalt road surface in standard practice.
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