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Recycled aggregates to asphalt mixtures of the flexible pavements
Kropáč, Pavel ; Zdřálek, Petr (referee) ; Stehlík, Dušan (advisor)
This thesis deals with the theoretical part of the creation, distribution and recycling of construction and demolition waste. Subsequently covers made from these recycled construction and demolition waste and its potential application in structural layers of the pavement. In the practical part of the thesis deals with monitoring the overall properties of nine asphalt mixtures with different proportion of recycled concrete aggregate and asphalt binder, which are designed and intended for bed asphalt pavement. The recycled concrete aggregate and asphalt are performed various laboratory tests, the results are subjected to a comparison with the relevant standards and TP 210. The conclusion is made price comparisons of asphalt mixtures.
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Quality of the recycled aggregates to the roads
Sokolová, Veronika ; Pecha, Karel (referee) ; Stehlík, Dušan (advisor)
Theoretical part of the thesis describes the production, properties and characteristics of recycled aggregates and the resulting assessment of the suitability of its use in the construction of roads. The practical part is focused on implementing the basic tests of aggregates according to applicable standards, such as bulk density, water absorption and resistance to crushing of aggregates. Tests are performed on fractions of the three types of recycled aggregate and then compared with the same results of tests on natural aggregates.
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SCC with secondary raw materials
Ťažká, Lucia ; Ťažký, Tomáš (referee) ; Hela, Rudolf (advisor)
Bachelor thesis is focused on the possibility of using secondary raw materials and their application to the production of SCC. Large part deals with impurities of type I and its application results mainly from abroad. Furthermore, this work examines the impact of different types of impurities on the resulting concrete durability in various aggressive environments. The practical part is focused on the use of chemically non-reactive additives of type I instead of the commonly used additives of type II which are used to replace part of cement and the resulting design and manufacture of low-strength SCC using appropriate additives.
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Possibilities of using recycled concrete as fine aggregate replacement in cement screeds
Nováková, Iveta ; Brožovský,, jiří (referee) ; Hubáček, Adam (advisor)
The bachelor thesis deals with summary of knowledge about cement-based screed with partial replacement of natural aggregates by recycled aggregates. Special emphasis is given to describing and studying characteristics of cement-based flowscreed. In this study are described feedstocks with requirements which they must meet and test methods for testing properties of screeds. One part is also given to practical application of cement-based flowscreed with partial replacement of natural aggregates by recycled aggregates.
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Unbound and bound mixtures from recycled concrete of highway D1
Mikulíková, Petra ; Mondschein,, Petr (referee) ; Stehlík, Dušan (advisor)
The work is divided into two parts. The first part deals with the description of unbound and bound base layers and their comparison. Furthermore is presented the description of the recycled concrete, its properties, production, improvement and issues. International experiences with recycled concrete technology are described as well. The practical part is focused on laboratory testing of concrete recycled material taken from the highway D1. The aim of this part is to determine whether the concrete can be recycled back into unbound or bound base layers and concrete casing.
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Study of durability of concrete with recycled concrete and brick
Voráč, Jiří ; Hela,, Vlastimil (referee) ; Hela, Rudolf (advisor)
This bachelor thesis deals with issues of recycled concrete. The theoretical part describes the process of recycling the construction and demolition waste and describes requirements for recycled aggregate and recycled concrete in Czech republic and some of the member states of EU. The experimental part is focused on design of concrete with a substitution of coarse aggregate with a recycled concrete and brick aggregate.
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A study of the possibilities of using recycled concrete in the UAE for the production of structural concrete
Lakomá, Karolína ; Novosad, Petr (referee) ; Hela, Rudolf (advisor)
The thesis focuses on verifying the possibilities of utilizing recycled concrete aggregates originating from demolitions in the United Arab Emirates (UAE) in structural concretes for ready-mix concrete technologies. The theoretical part summarizes knowledge in the field of recycled concrete aggregates, their preparation, and production. It outlines the standard requirements for the UAE, the Czech Republic and globally. Additionally, it describes the influences of recycled aggregates on fresh and hardened concrete. The goal of the experimental section was to verify the resulting properties of natural and recycled aggregates. Moreover, the thesis addresses the formulation design for reference and recycled concretes. Tests for both fresh and hardened concrete were conducted based on these formulations. This work compares the achieved results with those obtained in another study from the Czech Republic which is also focused on the use of recycled concrete. Furthermore, an economic analysis comparing the prices of reference and recycled concretes on 1 m3 is conducted within the experimental section.
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The possibility of using recycled concrete for the production of structural concrete
Pijáčková, Erika ; Křížová, Klára (referee) ; Hela, Rudolf (advisor)
The bachelor's thesis deals with the topic of recycled concrete aggregate and its use in the field of structural concrete. The aim of the work was to describe the possibility of complete or partial replacement of natural aggregates with recycled concrete aggregates for concretes of strength classes C16/20 to C30/37. The theoretical part is composed of findings from both domestic and foreign research and legislation, which were used to evaluate the possibility of more frequent use of recycled concrete aggregates in civil engineering in the Czech Republic. The experimental part consists of the design of concrete recipes with natural and concrete recycled aggregates and their economic evaluation.
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Possibilities of using recycled materials for the green roofs constructions
Skalková, Markéta ; Žák, Antonín (referee) ; Žižková, Nikol (advisor)
This bachelor thesis deals with the issue of using recycled building materials in the green roofs. It studies the history, function, benefits and negative impacts, composition, division and structural layers of green roofs. The work describes the production, application and common features of recycled building materials. It determines the basic properties of selected recyclates and evaluates their partial suitability as some of the layers of a green roof.
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Change in the durability of concrete made of recycled concrete by alternative addition of ceramic admixtures
Stavař, Tomáš ; Hoffmann, Oldřich (referee) ; Stehlík, Michal (advisor)
The master thesis dealing with problematic about durability of concrete, with use of recycled concrete and addition of silica additions. Predominant for resistance of concrete constructions is surface layer, through which aggressive gasses and liquids penetrate from surrounding environment. The most important indicator of concrete durability is ability of surface layer transmissions of aggressive substants. In experimental part will be defined the actual state of surface layer by normal testing methods. The transmissions of surface layer will be tested on concrete cubes. Tests for transmissions of air (method TORRENT), of water (method ISAT), of acid gases (dept of carbonation by quick test in 98% CO2) will be carried out and also strength tests. Assessment of positive or negative influence of additions and amount of cement on durability and mechanical properties of concrete will be discussed in conclusion.
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