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Optimization of concrete mixture based on alkali activation of secondary materials
Šafář, Martin ; Šoukal, František (referee) ; Kalina, Lukáš (advisor)
This bachelor thesis deals with design, preparation and optimization of concrete mixture based on alkali activated secondary materials – blast furnace slag and fly ash. Sodium hydroxide partially replaced by bypass cement kiln dust was used as an activator. Mixture design was based on model made for Portland cement based concrete. Observed properties were workability of fresh mortar, price of mixtures and mechanical properties of concrete. Microstructure and composition of concrete was studied by SEM-EDX and XRD. Analysis of raw materials was based on XRF. The optimal mixture composition was chosen from obtained data.
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Methods of using cement kiln by-pass dust in building materials technology
Sikorová, Věra ; Koplík, Jan (referee) ; Kalina, Lukáš (advisor)
This diploma thesis is focused on methods of using cement kiln by-pass dust in building materials technology. By-pass dust was treated to remove chlorides and could then be used as other constituent to various types of cements in the amount of 0–5 wt. % according to ČSN EN 197-1. The properties of dusts before and after chloride removal were examined and after incorporating modified by-pass dust into the cement, the properties of fresh and hardened cement pastes and mortars were studied. It was found that modified by-pass dust after incorporation into cement fulfill requirements of ČSN EN 197-1.
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Synthesis of Aluminosilicate Systems Based on Alkali Activation of Industrial By-Products
Kalina, Lukáš ; Rovnaníková, Pavla (referee) ; Škvára, František (referee) ; Havlica, Jaromír (advisor)
Portland cement-based products are the most commonly used building materials. However, it is well known that the production of OPC not only consumes a significant amount of natural resources and energy but also releases high quantity of carbon dioxide (CO2) to the atmosphere. Purpose of this work is to develop new cementitious material similar to Portland cement-based concrete, which is convenient in terms of energy and is environmental-friendly at once. This work presents preparation, composition and properties of inorganic aluminosilicate polymer, called geopolymer, synthesized from blast furnace slag and fly ash, activated by sodium hydroxide and cement kiln dust. Study of the microstructure was based on SEM-EDX-WDX, TG-DTA-EGA and XRD analysis.
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Possibilities of Chloride Ions Binding in Alkali-Activated Slag Systems
Chadima, Jan ; Kalina, Lukáš (referee) ; Bílek, Vlastimil (advisor)
This bachelor thesis deals with chloride binding in alkali activated slag and tries to bind chlorides by adding metakaolin, alumina and cement bypass kiln dust to form Friedel’s salt in alkali activated system. These admixtures were selected as a potential sources of aluminate ions that are necessary for the formation of this salt. The amount of chlorides in solid samples and in leachates was determined by Volhard titration. To find out phase composition X-ray diffraction and thermogravimetric and differential thermal analysis were used. Chloride ions were bound in by far the greatest extent in the pastes containing cement bypass dust because only in this case Friedel’s salt was formed. In the case of alumina and metakaolin chlorides were bound likely via adsorption on C-S-H phase.
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Methods of using cement kiln by-pass dust in building materials technology
Sikorová, Věra ; Koplík, Jan (referee) ; Kalina, Lukáš (advisor)
This diploma thesis is focused on methods of using cement kiln by-pass dust in building materials technology. By-pass dust was treated to remove chlorides and could then be used as other constituent to various types of cements in the amount of 0–5 wt. % according to ČSN EN 197-1. The properties of dusts before and after chloride removal were examined and after incorporating modified by-pass dust into the cement, the properties of fresh and hardened cement pastes and mortars were studied. It was found that modified by-pass dust after incorporation into cement fulfill requirements of ČSN EN 197-1.
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Possibilities of Chloride Ions Binding in Alkali-Activated Slag Systems
Chadima, Jan ; Kalina, Lukáš (referee) ; Bílek, Vlastimil (advisor)
This bachelor thesis deals with chloride binding in alkali activated slag and tries to bind chlorides by adding metakaolin, alumina and cement bypass kiln dust to form Friedel’s salt in alkali activated system. These admixtures were selected as a potential sources of aluminate ions that are necessary for the formation of this salt. The amount of chlorides in solid samples and in leachates was determined by Volhard titration. To find out phase composition X-ray diffraction and thermogravimetric and differential thermal analysis were used. Chloride ions were bound in by far the greatest extent in the pastes containing cement bypass dust because only in this case Friedel’s salt was formed. In the case of alumina and metakaolin chlorides were bound likely via adsorption on C-S-H phase.
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Synthesis of Aluminosilicate Systems Based on Alkali Activation of Industrial By-Products
Kalina, Lukáš ; Rovnaníková, Pavla (referee) ; Škvára, František (referee) ; Havlica, Jaromír (advisor)
Portland cement-based products are the most commonly used building materials. However, it is well known that the production of OPC not only consumes a significant amount of natural resources and energy but also releases high quantity of carbon dioxide (CO2) to the atmosphere. Purpose of this work is to develop new cementitious material similar to Portland cement-based concrete, which is convenient in terms of energy and is environmental-friendly at once. This work presents preparation, composition and properties of inorganic aluminosilicate polymer, called geopolymer, synthesized from blast furnace slag and fly ash, activated by sodium hydroxide and cement kiln dust. Study of the microstructure was based on SEM-EDX-WDX, TG-DTA-EGA and XRD analysis.
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Optimization of concrete mixture based on alkali activation of secondary materials
Šafář, Martin ; Šoukal, František (referee) ; Kalina, Lukáš (advisor)
This bachelor thesis deals with design, preparation and optimization of concrete mixture based on alkali activated secondary materials – blast furnace slag and fly ash. Sodium hydroxide partially replaced by bypass cement kiln dust was used as an activator. Mixture design was based on model made for Portland cement based concrete. Observed properties were workability of fresh mortar, price of mixtures and mechanical properties of concrete. Microstructure and composition of concrete was studied by SEM-EDX and XRD. Analysis of raw materials was based on XRF. The optimal mixture composition was chosen from obtained data.
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