National Repository of Grey Literature 5 records found  Search took 0.01 seconds. 
Preparation of historical binders with high resistance to ambient influences
Nehybka, Josef ; Palovčík, Jakub (referee) ; Opravil, Tomáš (advisor)
This master’s thesis is focused on preparation of the mortar mixtures inspired by roman cement with a great resistivity against the corrosion environment, especially a seawater. There were prepared samples of a roman cement containing of pure lime and various artificial pozzolans and natural tuff which were used as pozzolan admixtures. The task of this work is to explore possibility of using pure lime and for example pozzolan admixture which can resist against the corrosive environment like a roman cement. There were prepared a lot of various samples which were tested separately on their mechanical characteristics before and after their exposure of the influence of the corrosive environment. There were used X-ray diffraction analysis for the characterization of a phase composition of the raw materials and some selected samples.
Utilisation of brick recycled materials for water retention in soils
Šmírová, Barbora ; Palovčík, Jakub (referee) ; Opravil, Tomáš (advisor)
This bachelor´s thesis deals with possible utilizations of brick recyclate as an element which cooperates in the field of water retention in the landscape, especially in agricultural soils. Brick recyclate has the same composition and properties as a classic burnt brick, and therefore is very wettable and porous. Above all, these properties are the key element to using brick recyclate as a water holding element in the soil. The aim of this thesis was to determine the ability of brick recyclate to retain water in the soil and then release it back into the soil. Various fractions of brick recyclate were tested experimentally. First experiments were performed with fine quartz sand, and then with two different real samples of soils.. The time for the evaporation of all the added water from the test mixture was assessed. For real samples of soils, experiments continued on the plants under defined laboratory conditions.
Possibilities of utilization of brick-grind-dust in systems based on portland cement
Palovčík, Jakub ; Kalina, Lukáš (referee) ; Opravil, Tomáš (advisor)
This thesis deals with possibilities of using brick-grind-dust which is a secondary product from manufacturing of grinded bricks. A boom in this method of masonry is connected with an increase of production of these secondary materials. These secondary materials are partly returned to brick manufacturing and partly buried in a landfill site. Due to their composition and origin, these materials are potentially pozzolan active, making them interesting for applications in hydraulic binders. The aim of the work was to study the physical and chemical properties of several brick-grind-dust and brick sands. Subsequently, binders based on these materials and Portland cement were prepared. The properties of the binders were modified by means of adding a commercially available polycarboxylate superplasticizer. The development of mechanical properties of the prepared binders has been studied over time. Hydration of the selected binders was analyzed by isothermal calorimetry.
Lightweight composites based on fluid filter ashes
Palovčík, Jakub ; Másilko, Jiří (referee) ; Opravil, Tomáš (advisor)
This Bachelor’s thesis deals with preparation, study and analysis of binders based on fluid filter ashes. Binders were doped with various additives to alter the rheological properties, reduce volumetric weight and increase flexural compressive and tensile strength. Next, a possibility of using waste polyester fibres for reinforcement in matrices based on above mentioned binders was determined. The prepared samples were tested for compression and flexural strength after 28 days. Phase composition was analysed by means of X-ray diffraction analysis.

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