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Methodology for determining the durability of concrete and its resistance to frost and chemical deicing salts
Chaloupková, Kristýna ; Novosad, Petr (referee) ; Hubáček, Adam (advisor)
The bachelor's thesis explores the possibilities of improving testing procedures for determining the resistance of concrete to frost and chemical deicing salts. Currently used testing methods are notably problematic in terms of their repeatability and reproducibility. These tests are influenced by several factors, including the method of sample storage prior to testing, the preparation of the test surface, and the significant impact of edge effects. Additionally, the raw materials used in the test solution also affect the outcomes. During the test, water condensation occurs in the freezing chamber, altering the concentration and level of the test solution.
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The issue of waterproof concrete for the concrete tunnel lining
Dipold, Václav ; Brožovský, Jiří (referee) ; Hubáček, Adam (advisor)
This bachelor thesis deals with a summary of requirements for waterproof lining of tunnels. Then focuses on the characteristics and requirements for concrete lining. Emphasis will be on requirements for fresh concrete, such as the hydration heat, the temperature requirements of concrete during storage and the requirements for concrete in the hardened state such as strength properties, modulus of elasticity and volume changes. Subsequently is discussed possibility of using SCC for this type of construction.
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Possibilities for testing and improving the durability of aerated concrete
Klaudová, Dana ; Voves, Jiří (referee) ; Hubáček, Adam (advisor)
This master´s thesis studies qualities of aerated concretes, is monitoring influenece concrete composition, quantity of aerating admixture and plasticized admixture on the durability of concrete. It is monitored especially air flow and his influence on durability on concrete. In theoretical part are explained mechanisms of damage concrete, phenomena, which influence compressive strength of concrete and then there are the results of resistance against the influence of chemical defrosting substances. In experimental work were designed, mixed and tested recipe of concerete. We investigated different atribute, especially resistance of the chemical defrosting and air flow in hardened concrete. The result of master´s thesis is effect of flow air in concrete on the durability.
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Study of the influence of additions on the durability of aerated concrete
Halešová, Adéla ; Voves, Jiří (referee) ; Hubáček, Adam (advisor)
The aim of this work is to summarise and consider the possibilities of using admixtures and their influence on the durability of aerated concrete.This bachelor's thesis is based on research findings concerning aerated concrete. Furthermore, it deals with the study of inert and active additions. The experimental part is focused on testing trial samples with the addition of admixtures. It examines what is the rate of the possible chosen physically-mechanical features such as the rate of air density, the durability of surface against the effect of water and chemical defrosting substances and achieving the required strength.
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Methods of assessing the increase in the durability of concrete products with a painted surface with a subsequent cure
Minaříková, Kateřina ; Eger, Lukáš (referee) ; Hubáček, Adam (advisor)
This diploma thesis is focused on the description and summary of existing knowledge about vibro-pressed concrete products with treated surface with protective coating, that is hardering by ultravioled and infrared radiation. The theoretical part describes the production of vibro-presses products, possible wayt of finishing the surface including the description of the most commonly used materials and the methods of application and hardering of protrctive coating on the surface. Another point of the theoretical part is creating of lime efflorescence on the concrete surface and their subsequent disappearance. The experimental part of the thesis is ficused on obtaining information about the properties of the modified pavements by these techologies and comparing the acquired properties with the charakteristice of the reference pavements that do not have any protective coating on their surface.
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Comparison of elastic moduli of building materials
Ballon, Marek ; Hubáček, Adam (referee) ; Brožovský, Jiří (advisor)
The bachelor thesis deals with the detection of static and dynamic elastic moduli of building materials, their comparison and overview of the relationships between them. Describes methods for the determination of static modulus of elasticity in the press loading and dynamic modulus of elasticity obtained by non-destructive methods, including ultrasonic pulse method and resonance method.
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The influence of the preparation and editing of test specimens for testing the durability of concrete and concrete products
Šťastný, Antonín ; Brožovský, Jiří (referee) ; Hubáček, Adam (advisor)
This bachelor’s thesis examines the influence of the preparation and editing of test specimens for testing the durability of concrete and concrete products. In particular it monitors the effect of surface treatment and storage of test samples on durability of concrete. The theoretical part describes the mechanism of damage to the samples exposed to salt scaling. It further describes the test methods, which identifies and describes the durability of concrete and concrete products according to the test standards in force in the Czech Republic. Three types of concerete was proposed and mixed in the experimental part of this work. They were using the same raw materials and were differed in degree of aeration. Samples were made from each types of concrete. Thay had different surface treatment, various degrese of saturation before the salt scaling test and the samples were compared with each other.
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Possibilities of using Crystallization and sealing Admixtures for Concrete in a highly chemically aggressive Environment
Fittl, David ; Slezák, Viktor (referee) ; Hubáček, Adam (advisor)
Previously neglected and today largely run-down agricultural and farm buildings, which have not been properly maintained, are in a dilapidated state. In recent years, however, farmers and husbandmen have been trying to create a greener and more sustainable environment. Therefore, construction companies and concrete manufacturers are under pressure to produce more resistant concrete structures with enhanced durability for buildings that must withstand aggressive environments. This thesis summarizes the current knowledge of the durability of concrete exposed to highly chemically aggressive environments; it provides a summary of the knowledge of individual types of crystallization additives in concrete; and it includes descriptions of the various types of environment affecting concrete and descriptions of agricultural and farm buildings.
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Waterproof concrete structures and regulations for the design and implementation
Křenek, Daniel ; Brožovský, Jiří (referee) ; Hubáček, Adam (advisor)
This thesis covers the issues of design, production, and property testing in regards to waterlight concrete structures. The testing conducted on the properties fit in accordance to the Czech Republic and international regulations. This thesis covers the issues of design, production, and property testing in regards to waterlight concrete structures. The experimental part focused on the design of the concrete mix, which stems from previous knowledge of individual, and speific regulations. Various types of cement were particularly examined along with studying the effects of admixtures that were partially replaced by cement with propoerties of watertight concrete
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