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Shear stress relaxation of bituminous binders in DSR
Musil, Vladimír ; Hegr, Zdeněk (referee) ; Dašek, Ondřej (advisor)
The thesis describes the relaxation properties of bituminous binders determined in dynamic shear rheometer (DSR). Paving bitumen, polymer modified bitumen (PMB) and crumb rubber modified bitumen (CRmB) were chosen for comparison. In order to describe the effects of ageing on asphalt binders relaxation properties, the laboratory simulation of ageing using RTFOT and 3xRTFOT method was performed. For each binder were simultaneously conducted tests of needle penetration, softening point and elastic recovery. Selected bitumens were used for the production of asphalt mixtures. The low-temperature properties tests (TSRST) were performed for these mixtures, when the results were compared to the relaxation properties of binders determined in the DSR.
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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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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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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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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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