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Durability of the waste building materials for subgrade
Lorenc, Daniel ; Hýzl, Petr (referee) ; Stehlík, Dušan (advisor)
The Bacherol thesis is focused on the use of waste building materials to subgrade of the pavement. Examines in detail advantages and disadvantages of this recycled material. Mainly deal with negative properities like water absorption and frost action, and figure out the dependance on the amount of brick parts in waste buildingng material. It practically verifies California bearing ratio, water absorption and rate of frost action of waste building material. A decisive impact on results will have a number of brick parts in recycled material.
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The use of the waste aggregates for bound mixtures of pavements
Chloupek, Adam ; Zajíček, Jan (referee) ; Stehlík, Dušan (advisor)
The works deals with the possibilities of using non-standard fraction of fine crushed aggregate in route base layers. Goal of my thesis is research of using material from specific location. Theoretical part summarizes basic knowledge regarding bound mixtures and their normative requirements. Practical part of my thesis describes my various mixture design and following testing and determination of design properties by official and experimental tests. The conclusion summarizes the researched outputs and findings, which confirm the future possibilities of using this material in base layers.
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Design of the bound mixtures to pavements
Hepner, Urban ; Pácha, Petr (referee) ; Stehlík, Dušan (advisor)
The bachelor thesis focuses on the monitoring of the impact of the shape on the tested bound mixture solid during the strength tests in an uniaxial stress. The theoretical part is devoted to the hydraulic binders bound mixtures, strength test in the uniaxial stress and furthemore discusses the foreign research concerning the topic of the strength ratio between a cylinder solid and a cubical solid. Practical part of the thesis describes the act of preparation of a mixture for the production of the test solids, laboratory tests provided on the prepared mixture, the production of the test solids and finally the following tests of the prepared solids strength in the uniaxial stress. All the results from the tests of the strenght in the uniaxial stress are in the end evaluated and compared to the foreign research.
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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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Waste building material to subgrade pavement
Masař, Daniel ; Hýzl, Petr (referee) ; Stehlík, Dušan (advisor)
The theoretical part of the diploma thesis searches the production of Construction and demolition waste and their subsequent transformation into the final recyclate and its possible use in roads. Attention is focused on the use of mixed recycled material into subgrade of the pavement and the characteristics of tests that must be performed before its used to the road. The next chapters pai attention to the problematic properties of recyclates, foreign experience with the use of mixed recyclate in Construction and the possibilities of its development. The practical part verifies the suitability of mixed recycled material into subgrade of the pavement using laboratory tests. The tests are performer on individual mixtures of mixed recycled material with cement, blast furnace slag or cement dust in various percentages. The results are then compared and it is evaluated which mixtures show the best properties. Part of the practical part is also the economic evaluation of these mixtures against commonly used materials.
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Use of polymers in road constructions
Klusková, Jana ; Komenda, Radek (referee) ; Stehlík, Dušan (advisor)
The diploma thesis deals with the use of recycled polymers in asphalt mixtures. In the theoretical part of the thesis there is discussed the global issue of plastic waste including the experience of foreign countries, where this technology has already been introducted and used. The practical part is devoted to the proposal of using recycled plastic in asphalt mixture, description of used laboratory tests and the evaluating the effect of low-density polyethylen (LDPE) on the asphalt mixture type AC. There were performed tensile strenght tests, water resistant tests and stiffness modulus tests in the laboratory (E). The output of this work is an evaluation of measured values, processing of results and their interpretation depending on the possible use of this technology in Czech republic.
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Cold asphalt mixtures with R-material
Ševc, Jan ; Mondschein,, Petr (referee) ; Stehlík, Dušan (advisor)
The thesis is focused on the use of R-material into cold asphalt mixtures. It deals with cold recycling and with input materials for this technology. It verifies properties of R-material and residues of bituminous binder. It also verifies properties of designed cold asphalt mixtures by the probative controls (indirect tensile strenght and water resistance). Furthermore is focused on the experimental measurement of selected mixtures to ensure more characteristics. The amount of homogenity of R-material, quantity and quality of residues bituminous binder is essential for positive results.
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The use of asphalt recycled materials in the base and subbase layers of pavements
Tanečková, Pavlína ; Hýzl, Petr (referee) ; Stehlík, Dušan (advisor)
This thesis consists of theoretical and practical parts. The theoretical part gathers available information on the current state of construction and demolition waste management. This part discusses foreign experiences with SDW management, provides basic information on the introduction of circular economy. Equally important is the environmental impact, which is discussed from the perspective of Decree No 283/2023 Coll. It also provides basic information on construction and demolition waste and describes the recycling process. It also discusses the most common types of recyclates and their use in roads. The practical part of this thesis verifies the possibilities of using asphalt recyclates and their mixtures cemented with asphalt emulsion or hydraulic binder. The main objective was to verify the possibilities of using these recyclates in cemented subbase layers for urban roads. These possibilities were verified and then compared by means of laboratory tests. Finally, a comparison of cemented mixtures of asphalt recyclates with specific binder dosage and low temperature heating of the mixture for optimum compaction to the desired strength values using recyclates is made.
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The amount of damage determination in cases of defects and failures of flexible pavements road structures
Špaček, Petr ; Jůza, Petr (referee) ; Kledus, Robert (referee) ; Stehlík, Dušan (advisor)
This thesis is focused on possibilities of financial valuation of flexible pavements surface layers conditions, in connection with whole life cycle of the pavement and certain possibilities of their maintenance and repairs, in cases of defects and failures from forensic engineering point of view. There were carried out analysis of the topics connected with judging of flexible pavements surface layers defects and failures related to forensic investigation in the Czech Republic, as well as abroad. In this thesis there were created pricing models of the certain construction works which are related to repairs and maintenance of flexible pavements. Within the possibilities of the author, there were compared market prices of the particular construction works in selected regions with the prices according to generally used pricing systems in the Czech Republic. The goal of this thesis is to create unified methodology for amount of damage financial valuation in cases of defects and failures of flexible road pavements surface layers for forensic engineering practice in the Czech Republic.
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The waste buildings material to subgrade of the pavement
Ševc, Jan ; Pecha, Karel (referee) ; Stehlík, Dušan (advisor)
The thesis is focused on the use of waste buildings materials to subgrade of the pavement. In detail it deals with monitoring the carrying capacity of the material used to replace unsuitable subgrade mainly of the urban road communications. It practically verifies California bearing ratio and resistance to frost and water of the waste buildings materials firmed by cement for possible use in subbase layers. The amount of residues in recycled bricks is essential for positive results in terms of the properties of materials in subgrade of the pavement.
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