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Study of usabiliti of sands for preparation of aeroconcrete in hydrotermal condition
Straka, Radek ; Ptáček, Petr (referee) ; Opravil, Tomáš (advisor)
A building industry is expanding branch all the time and it intervenes in the life of everyone. Aeroconcrete is very attractive and actual subject nowadays because economy is important point of view of production. This material finds a wide-spread use thanks to its specific properties. The good manipulation and great thermal insulating properties are secured by its porous structure. Furthermore, proper material selection provides a saving of power of house for every customer demands. Due to aeroconcrete's sufficient compressive strength it is useful for both constructions and internal walls. Fundamental and very important for final material properties is raw material composition of aeroconcrete. A relationship between composition of filler (quartz sand) and resultant properties of aeroconcrete is an objective of the thesis.
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The Possibilities of Accelerating of Ageing process of Brickmaking raw materials mixtures
Lukášková, Monika ; Stančík,, Hynek (referee) ; Sokolář, Radomír (advisor)
Aim of this thesis lies mainly in the verification of how to speed up the time of maturing of brick ceramic mixtures by adding hot water. The theoretical part describes the history of ceramics, brick, ceramic products, manufacture of ceramic brick shards and the time required maturing and its influence on the final properties of ceramic products. In the practical part will be used one type of brick earth and then it will mix a plastic dough, which will be from the current production of mixtures distinguished higher temperature mixing water. Next step is to describe the procedures for tests on individual samples. The outcome of this work should be to evaluate which water temperature is best for shortening the time of maturing brick ceramic mixtures, and what effect this acceleration have on resting of the plastic dough and what is the final characteristics of this sample.
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The technology of aerated concrete
Zezulová, Anežka ; Kalina, Lukáš (referee) ; Opravil, Tomáš (advisor)
The technology of aerated concrete is a topic that is permanently studied and developed because of the incessant demand for a building material which ensures relatively high strength at low volume weight. This bachelor’s thesis examines the influence of replacing a part of sand with another silica material – microsilica. The increase of mechanical strength is expected at the same volume weight. Microsilica contents around 98 % of amorphous silicon dioxide with a high specific surface area that is substantially higher than a specific surface area of a ground sand. The reactivity of silicon dioxide increases with a higher specific surface area and also with the creation of a mineral tobermorite, which is the keeper of the strength in autoclaved aerated concrete. Three types of microsilica were chosen to examine the influence of replacing a part of sand with microsilica according to their availability for manufacture: microsilica Sikron and Elkem 971 U, microsilica Grace Davison was tested only marginally. Tests were carried out to determine volume weight, compressive strength, phase composition (by X-Ray diffraction method), and the content of tobermorit (by TG-DTA method).
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The Possibilities of Accelerating of Ageing process of Brickmaking raw materials mixtures
Lukášková, Monika ; Stančík,, Hynek (referee) ; Sokolář, Radomír (advisor)
Aim of this thesis lies mainly in the verification of how to speed up the time of maturing of brick ceramic mixtures by adding hot water. The theoretical part describes the history of ceramics, brick, ceramic products, manufacture of ceramic brick shards and the time required maturing and its influence on the final properties of ceramic products. In the practical part will be used one type of brick earth and then it will mix a plastic dough, which will be from the current production of mixtures distinguished higher temperature mixing water. Next step is to describe the procedures for tests on individual samples. The outcome of this work should be to evaluate which water temperature is best for shortening the time of maturing brick ceramic mixtures, and what effect this acceleration have on resting of the plastic dough and what is the final characteristics of this sample.
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Study of usabiliti of sands for preparation of aeroconcrete in hydrotermal condition
Straka, Radek ; Ptáček, Petr (referee) ; Opravil, Tomáš (advisor)
A building industry is expanding branch all the time and it intervenes in the life of everyone. Aeroconcrete is very attractive and actual subject nowadays because economy is important point of view of production. This material finds a wide-spread use thanks to its specific properties. The good manipulation and great thermal insulating properties are secured by its porous structure. Furthermore, proper material selection provides a saving of power of house for every customer demands. Due to aeroconcrete's sufficient compressive strength it is useful for both constructions and internal walls. Fundamental and very important for final material properties is raw material composition of aeroconcrete. A relationship between composition of filler (quartz sand) and resultant properties of aeroconcrete is an objective of the thesis.
|
|
|
The technology of aerated concrete
Zezulová, Anežka ; Kalina, Lukáš (referee) ; Opravil, Tomáš (advisor)
The technology of aerated concrete is a topic that is permanently studied and developed because of the incessant demand for a building material which ensures relatively high strength at low volume weight. This bachelor’s thesis examines the influence of replacing a part of sand with another silica material – microsilica. The increase of mechanical strength is expected at the same volume weight. Microsilica contents around 98 % of amorphous silicon dioxide with a high specific surface area that is substantially higher than a specific surface area of a ground sand. The reactivity of silicon dioxide increases with a higher specific surface area and also with the creation of a mineral tobermorite, which is the keeper of the strength in autoclaved aerated concrete. Three types of microsilica were chosen to examine the influence of replacing a part of sand with microsilica according to their availability for manufacture: microsilica Sikron and Elkem 971 U, microsilica Grace Davison was tested only marginally. Tests were carried out to determine volume weight, compressive strength, phase composition (by X-Ray diffraction method), and the content of tobermorit (by TG-DTA method).
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