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Dependance of pavement surface skid resistance on aggregate polishing and traffic loading
Dašková, Jaroslava ; Čelko,, Ján (referee) ; Šachl,, Jindřich (referee) ; Vojtěšek, Antonín (referee) ; Kudrna, Jan (advisor)
Road safety is a complex problem. It is influenced mainly by the driver, the vehicle and the road surface. This thesis is focused on the road surface properties and especially skid resistance that directly affect the braking distance and keeping the vehicle in the horizontal curves and thus traffic accidents. The thesis deals with the durability of pavement surface skid resistance, the type of pavement layers and aggregate polishing used in wearing course. The aim of this thesis was to develop the methodology for improvement of road surfaces skid resistance durability and implementation of functional test for their assessment.
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Bituminous mixture desing with the use of 30 % reclaimed asphalt and its functional evaluation
Horáček, Daniel ; Šperka, Pavel (referee) ; Kudrna, Jan (advisor)
The aim of my bachelor thesis is to design asphalt mixture with a higher lifetime (mixture of type VMT 16) and its subsequent assessment by selected functional tests. VMT blends are used for load and underlayer layers of roads with higher transport loads. The main idea of this bachelor thesis is the design of an asphalt mixture consisting of natural aggregates, recycled asphalt mixtures and crumb rubber modified bitumen, yet retaining good road-holding properties. The use of recyclable bituminous mixtures will allow the recycling of bent or milled asphalt layers, which is currently high in surplus, and will allow the overall cost of building new high-quality asphalt layers to be reduced. The bachelor thesis describes the empirical and functional tests performed, according to which the resulting asphalt mixture was designed, and the results compared with the TP151 Asphalt mixture with high modulus of stiffness (VMT).
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Application of crumb rubber in bituminous binders and in bituminous mixtures
Dašek, Ondřej ; Fišer,, Jiří (referee) ; Vacín,, Otakar (referee) ; Komačka,, Jozef (referee) ; Kudrna, Jan (advisor)
Presented dissertation thesis is focused on the possibility of using the crumb rubber from waste tires for modification of paving grade bitumen. The resulting asphalt rubber can be used as an alternative to polymer modified bitumen in compacted bituminous mixtures. The theoretical part describes the rheological properties of asphalt binders and the history and today state of the art in the world and in the Czech Republic. The practical part of the work contains a description of the properties of chosen crumb rubbers and produced asphalt rubbers focused on their rheological properties and on change of these properties caused by the aging at high temperature. Subsequently, the chosen empirical and functional properties of bituminous mixtures with asphalt rubber are described. Laboratory properties of these mixtures were verified under real service conditions on 32 test sections. Based on the dissertation thesis results the preliminary technical specification of the Ministry of Transport (TP 148) and their following revision were approved. The conclusion of the work summarizes and highlights the results of the dissertation.
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New world experience with Asphalt-Rubber pavement
Jevínová, Alexandra ; Urbanec, Květoslav (referee) ; Kudrna, Jan (advisor)
The road infrastructure and the services provided in road transportation are inseparable part of everyday people´s life, improving economic development, competitiveness and social prosperity. Development of the road infrastructure is extensive process, both financially and technically, and in Czech and Slovak conditions it mostly depends on EU funds. In the recent years there is a great need for new approach of design and realization of the road projects in the selection of the most appropriate solution in feasibility study beginning in the project stage, continuing in realization, taking into account the possibilities of using all kinds of recycled material, which can otherwise end up in the landfills. One of the mentioned materials are also waste tires. The main goal of bachelor thesis is to verify the possibilities of application the waste tires in the road construction focusing on the technology of Crumb Rubber modified Bitumen using “wet process “(continuous blend).
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The use of glassgrids in asphalt pavement structure
Sadil, Dominik ; Šperka, Pavel (referee) ; Kudrna, Jan (advisor)
The bachelor thesis deals with the use of fiberglass grids in asphalt layers. These materials are used as reinforcement materials in road construction primarily to partially elimination or delay the formation of cracks in the roadway and to transfer the tensile loads that are distributed to the sub-layers. The bachelor thesis tests the properties asphalt layers reinforced by geogrids by using selected functional tests and also was monitored their behavior between asphalt layers. At the same time, the thesis determines whether these functional tests are practically applicable for asphalt layers with fiberglass grids.
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Rheological properties of binders
Hotař, Petr ; Fišer,, Jiří (referee) ; Kudrna, Jan (advisor)
The comparison of rheological properties (complex shear modulus and phase angle and dynamic viscosity) of four paving bitumens and two polymer modified bitumens is performed in this diploma thesis. Furthermore, the empirical tests (needle penetration and softening point) were determined on these binders. Effect of asphalt binders aging was modeled using RTFOT test and modified RTFOT test (3 x RTFOT).
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Bituminous mixture for wearing course with increased content of reclaimed asphalt
Spies, Karel ; Šperka, Pavel (referee) ; Kudrna, Jan (advisor)
The bachelor thesis deals with design of asphalt mixture for wearing course, by performing functional tests according to ČSN EN 12697 (736160) Bituminous mixtures - Test methods for hot asphalt mixtures and comparison of its properties with asphalt concrete for wearing course (ACO 11 +) according to ČSN EN 13108-1 ed. 2 (736140) Bituminous mixtures - Specification for materials - Part 1: Bituminous concrete. The proposed layer is characterized by a high (50%) reclaimed asphalt pavement content (RAP) and the use of a crumb rubber modified bitumen (CRMB) without the use of rejuvenators or other softening additives. The aim of the work is to verify the expected properties of the asphalt mixture and point out the possibility of using larger amounts of reclaimed asphalt pavement in asphalt mixtures.
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