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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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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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Properties of reinforcing glass-fiber geogrids
Veselý, Petr ; Šperka, Pavel (referee) ; Dašek, Ondřej (advisor)
A proper road infrastructure is an essential part of today’s economy. Usage of roadways should be safe and its flow should be easy going. Primary net of roadways is already in place and attention shifts to its maintenance. Because of constantly increasing loads of heavy traffic, roadways are degrading at a faster pace, while there are still smaller time windows and less avialable resources for their reconstruction. That is why there has been rising demand for pavements that last longer and are able to carry higher weights. With respect to the rural roads it becomes obvious because of low amount of resources for their maintenance, that it is necessary to find an effective way to enhance pavements. From the foregoing it can be safe to say, that there is a clear need for reliable, durable and cost-effective technology of maintenance, such as the use of grids in asphalt pavements. This thesis deals with properties of geogrids made of glass fiber after its compaction as well as its effects on reduction or elimination of spreading of cracks in pavements.
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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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Cold Mix Asphalt
Kolesniková, Simona ; Valenta, Jakub (referee) ; Šperka, Pavel (advisor)
The diploma thesis deals with the issue of cold asphalt mixtures, which are commonly used for temporary repairs of potholes on roads, especially in winter months. The theoretical section describes some of the world´s researches on this topic. This section also includes manufacturers of cold asphalt mixtures in the Czech Republic and products available on the Czech market are presented. The practical part describes the properties of the materials used, the results of laboratory testing on test speciments made of cold asphalt mixtures and their comparison with the properties of asphalt concrete for wearing course. The effect of hot mix asphalt temperature during compaction on selected properties i salso analysed.
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Evaluation of Selected Properties of Asphalt Mixtures with High Air Void Content
Jakub, Tomáš ; Dašek, Ondřej (referee) ; Šperka, Pavel (advisor)
The bachelor thesis is focused on selected properties of asphalt mixtures with higher air-voids content. The first, theoretical part of the work deals with summary of the available literature. Especially in terms of the distribution of mixtures with higher air-voids content and basic effects of air-voids content behavior of the asphalt mixtures. The second, parctical part of the work deals with determinine properties of two asphalt mixtures, namely: porous asphalt (PA 8) and mastix asphalt with higher air-voids content (SMA NH 8). At first is described used test‘s methods and used materials. Within the work, some tests were modified in order to simulate the effect of frost and salt on asphalt mixtures. An integral part of the practical part is the determintation of water resistence (ITSR), frost and salt of the prepared mixture, their mutual comparison and comparison with existing regulations.
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Low-temperature behavior of asphalt binders
Čumíčková, Markéta ; Šperka, Pavel (referee) ; Stehlík, Dušan (advisor)
The work is focused on low-temperature behavior of specimens of asphalt binders and polymer modified bitumens. In the theoretical part, the principles and procedures of tests are simply described: Needle Penetration, Softening Point, Bending Beam Rheometer and Fraass breaking point. In the practical part, results of tests are demonstrated to graphs. The aim of thesis is to determine the correlation between tests.
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Microsurfacing using Reclaimed Asphal Pavement
Kolesniková, Simona ; Valenta, Jakub (referee) ; Šperka, Pavel (advisor)
The road network in the Czech Republic is almost 55,738 km long and its maintenance has been underfunded for a long time. It is therefore necessary to look for ways to extend the overall service life of roads. Microsurfacings belong to the emulsion slurry layers and are made up of a thin layer of a mixture of aggregate and modified asphalt emulsion. It is a pavement maintenance technology used to extend the service life of pavements by 5 to 9 years. As the supply of quality aggregate is gradually decreasing and the price of feedstock for microsurfacing is increasing, the possibility of incorporating R-material into this technology needs to be addressed. This thesis deals with the replacement of natural aggregates in microsurface R-material in the amount of 100 %. In the framework of the work, the formulation of the microsurface with R-material was optimized.
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Innovative Asphalt Mixtures for Wearing Course with a Higher Content of Reclaimed Asphalt Pavement
Spies, Karel ; Hegr, Zdeněk (referee) ; Šperka, Pavel (advisor)
This master's thesis deals with the design of two asphalt mixtures for a wearing course containing 35 % R-material. The asphalt mixtures use a soft bitumen modified with crumb rubber (CRMB) or the unmodified soft binder itself with a penetration grade of 70/100. The work verifies the effect of crumb rubber as a bitumen modifier on the properties of the asphalt mixture with reclaimed asphalt pavement (RAP). At the same time, the work deals with the possibility of using higher amounts of reclaimed asphalt pavement only in combination with a softer binder without the use of rejuvenating additives. The properties of asphalt binders and mixtures are verified using suitable functional tests. Furthermore, the proposed mixtures and their results are compared from various perspectives. At the same time, the thesis in the theoretical part deals with the dosing of a reclaimed asphalt pavement into the asphalt mixture and describes the handling and use of reclaimed asphalt pavement in the Czech Republic and abroad
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Re-using Asphalt Reinforcement Geogrids in Asphalt Mixtures
Provazník, Petr ; Sadil, Dominik (referee) ; Šperka, Pavel (advisor)
The bachelor thesis deals with the topic of re-using reinforcing fiberglass grid which are applied to asphalt layers. The theoretical part describes the general properties of reinforcing materials which includes reinforcement grids and also reinforcing dispersed fibres. There is also a characterization of reclaimed asphalt pavement and its current use. The practical part investigates the properties of reclaimed asphalt pavement which contains milled fiberglass grids. For this purpose several sets of test specimens were made of reclaimed asphalt pavement with proportion of milled fiberglass geogrids. The individual properties of the samples were compared with the initial set which did not contain milled grids. Another comparative sample was R-material to which were added Forta-Fi reinforcing fibers. Functional tests ITS and stiffness were performed on the made samples.
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