Browsing by Author "Opravil, Tomáš"

Alternativní kameniva na bázi druhotných surovin z energetického průmyslu

Kratochvíl, Jiří

Vysokoteplotní i fluidní popílky nejsou v současné době dostatečně využívány a jsou deponovány ve značných množstvích. Tato práce se snaží nalézt a ověřit některé možnosti jejich vhodného uplatnění ve stavebnictví, konkrétně ...

Application of brick grind dust in systems based on Portland cement

Palovčík, Jakub; Opravil, Tomáš; Novotný, Radoslav; Másilko, Jiří (IOP Publishing, 2018-07-12)

This paper deals with possibilities of application brick-grind-dust which is a secondary product from manufacturing of grinded bricks. This product is usually partially returned to brick manufacturing or buried on a land ...

The ash from fluidized bed combustion as a donor of sulfates to the Portland clinker

Beranová, Denisa; Bartoníčková, Eva; Koplík, Jan; Opravil, Tomáš (Elsevier, 2016-08-03)

The paper deals with possibilities of using solid residues from fluidized bed combustion of coal, bed and filter ash in the production of composite Portland cements. The ash from fluidized bed combustion contains a high ...

Betony na bázi tuhých zbytků z fluidního spalování

Darakevová, Michaela

Tato práce je zaměřena na možnosti využití druhotných surovin z energetického průmyslu ve stavebnictví, konkrétně v betonových aplikacích, kde jako hlavní suroviny pojivové části kompozice jsou použity tuhé zbytky fluidního ...

Determination accuracy of analysis refractory materials by x-ray fluorescence

Janča, Martin; Šiler, Pavel; Opravil, Tomáš; Kotrla, Jan (IOP Publishing, 2018-07-12)

This work was focused on the finding of the right way how to analyze refractory materials by X-ray fluorescence. This method can provide accurate results which can be easily repeated, what is the reason why this method is ...

Determination of Critical Parameters of Drug Substance Influencing Dissolution: A Case Study

Bojňanská, Erika; Kalina, Michal; Pařízek, Ladislav; Bartoníčková, Eva; Opravil, Tomáš; Veselý, Michal; Pekař, Miloslav; Jampílek, Josef (Hindawi Publishing Corporation, 2014-09-15)

The purpose of this study was to specify critical parameters (physicochemical characteristics) of drug substance that can affect dissolution profile/dissolution rate of the final drug product manufactured by validated ...

The determination of the influence of pH value of curing conditions on Portland cement hydration

Šiler, Pavel; Kolářová, Iva; Sehnal, Tomáš; Másilko, Jiří; Opravil, Tomáš (Elsevier, 2016-09-01)

Water composition during cement hydration can be changed due to migration of ions from the cement matrix to the solution. The storage of various materials together can lead to transfer of various ions and distortion of ...

The field of solid solutions in ternary system of synthetic apatite-type alkaline earth element-yttrium-silicate oxybritholite phases of the composition: AEE(delta)Y(10-delta)[SiO4](6)O3-0.5 delta, where AEE=Ca, Sr and Ba

Ptáček, Petr; Opravil, Tomáš; Šoukal, František; Tkacz, Jakub; Másilko, Jiří; Bartoníčková, Eva (Elsevier Ltd, 2016-01-08)

This contribution deals with the synthesis, properties and investigation of the field of solid solutions formed between the three end-members of apatite-type alkaline earth element-yttrium-silicate oxybritholites with the ...

The formation of feldspar strontian (SrAl2Si2O8) via ceramic route: Reaction mechanism, kinetics and thermodynamics of the process

Ptáček, Petr; Šoukal, František; Opravil, Tomáš; Bartoníčková, Eva; Wasserbauer, Jaromír (Elsevier, 2016-05-15)

The reaction mechanism, the equilibrium composition, the temperature range of stability of formed intermediates as well as the kinetics and thermodynamics of activated state during the formation of monoclinic strontium-a ...

Hodnocení vlastností vápna

Palušáková, Stanislava

Táto bakalárska práca sa zaoberá hodnotením vlastností vápien, ktoré sa používajú v oblasti pamiatkovej starostlivosti pamiatok, ale i pre bežné stavebné aplikácie. Cieľom tejto bakalárskej práce je zostaviť vhodnú sadu ...

Influence of Barium Oxide Additions on Portland Clinker

Zezulová, Anežka; Staněk, Theodor; Opravil, Tomáš (Institute of Rock Structure and Mechanics of The Czech Academy of Sciences, v. v. i., 2017-01-02)

Nowadays, nuclear power plants are widespread around the world and research is of great interest. Together with nuclear research, shielding of different types of radiation is an important current topic of research aiming ...

The influence of barium sulphate and barium carbonate on the Portland cement

Zezulová, Anežka; Staněk, Theodor; Opravil, Tomáš (Elsevier Ltd., 2016-08-03)

Shielding of different types of radiation should be studied these days when there is a great development in the field of nuclear science. Barium ions can shield different type of radiation, therefore, by incorporation of ...

The influence of starting materials´ solubility on tobermorite structure formation under the hydrothermal conditions

Galvánková, Lucie; Bartoníčková, Eva; Opravil, Tomáš; Tkacz, Jakub; Ptáček, Petr (IOP Publishing, 2018-07-12)

Overall, the tobermorite mineral crystallises under the hydrothermal conditions from the CaO-SiO2-H2O system. The system of calcium hydrosilicates species is extremely complex and many factors play an important role. The ...

Introduction of novel kinetic approach to calculation of activation energy and its application to the sinter-crystallization of strontian feldspar

Ptáček, Petr; Opravil, Tomáš; Šoukal, František (Elsevier, 2016-11-05)

The kinetics, the mechanism and the thermodynamics of activated state of formation of primary strontian feldspar via sinter-crystallization of non-equilibrium melt during the thermal treatment of ceramic body was investigated ...