|
|
Research in the field of preparation of anhydrite binders
Hanáček, Jan ; Dvořák, Karel (referee) ; Gazdič, Dominik (advisor)
The presented bachelor´s work deals with a research and development of sulphate binders on a base of anhydrite with focus on its potential usage in the industrial production of dry mortar mixtures. Within the scope of this work a mineralogical analysis of two industry gypsum was performed as well as an assessment of technological attributes while hydrating a laboratory burnt anhydrite II.
|
|
|
Methods of excitation of binders based on anhydrite
Sedlák, Michal ; Dvořák, Karel (referee) ; Gazdič, Dominik (advisor)
The bachelor thesis deals with the internal excitation of anhydrite-based mortars. In the theoretical part, the general theory of sulphate binders, the formation of gypsum binders and their resulting products during firing are described. The theoretical part also describes the anhydrite mortars, their hydration process and collects the existing research on anhydrite excitation in the world, where, among other things, it deals with the further usability of the resulting gypsum by-products. The experimental part focuses on the internal excitation of anhydrite, which is based on the existing research at the THD Institute. The work builds on previous studies that also dealt with internal excitation research. It includes an experiment performed to optimize the thermal regime in the form of increased isothermal endurance with subsequent evaluation by XRD analysis.
|
|
|
The admixtures which are influencing setting time of portland cement
Hlaváček, Jaroslav ; Kalina, Lukáš (referee) ; Opravil, Tomáš (advisor)
During the production of concrete is important the careful selection of raw materials. Nowadays, we are trying in the production to minimize the economic burden and to maximize the use of secondary raw materials. This work is focused on the use of secondary raw materials from the energy industry in construction for the preparation of hydraulic binders. As the main raw materials were used different power plant fly ash from fluidized combustion. The composition of these secondary materials is quite different from conventional high-temperature ash, due to mixing with water they solidify and harden. Experiments were performed with three lodge fly ash from electrostatic precipitators of the fluidized combustion and one high-temperature fly ash. This work is focused on the possibility of monitoring the use of these secondary materials in construction, especially when tests were evaluated characteristics of strength and speed of setting and hardening.
|
|
|
Possibilities of clay plasters shrinkage elimination
Melichar, Jindřich ; Koplík, Jan (referee) ; Opravil, Tomáš (advisor)
Earth plasters which are applicated in interiers don´t have just an estetic, but mainly heat storage function. To accomplish better storage properties the plaster has to be laid on the wall in sufficient thick ply. But this use to be accompained by creating of cracks during dehydration of the plaster. This bachelor work will be considering possibilities of elliminating this negative event by additing suitable components to suppress shrinkage and cracks by creating ettringite.
|
|
| |
|
|
Volume changes of concrete based on reactive powder components and possibilities of their regulation with chemical admixtures
Hlaváček, Jaroslav ; Kalinová, Helena (referee) ; Opravil, Tomáš (advisor)
Very high strength of RPC allows them to an unusual extreme possibilities of their applications. Volume change (shrinkage) negatively affects their relatively broad range of applications, particularly in applications which are used for filling tubes or other components. In today's advanced time with plenty of chemical ingredients and additives on the market (such as the expansion component) could be a side effect of this largely eliminated, or removed entirely. Only some components of the expansion will be appropriate for RPC cements. This reaserch investigates the expansion of ingredients on the basis of sulfates and monitors not only volume changes, but also the strength characteristics and tolerability of the tested anchors tested with a matrix component of the expansion.
|
|
|
Study of Exciters of Anhydrite Binders
Duda, Štěpán ; Vavrušková,, Lenka (referee) ; Gazdič, Dominik (advisor)
Presented diploma thesis is dealing with study of exciters of anhydrite binders. Theoretical part is dedicated to study of available domestic and foreign literature on a given topic. Attention is also paid to the study of the current research at the institute of THD. In the experimental part is developed a proposal of potential exciters of hydration on the basis of literature and according to the results of the research at the institute of THD. Next is proposed the methodological concept of the work. Testing of the monitored technological features follows. The study of the hydration process was recorded using XRD analysis and thermal analysis. Evaluation of the results was implemented by the mutual comparing of prepared recipes.
|
|
|
Methods of Excitation of Sulphate Binder Based on Anhydrite
Adameková, Paulína ; Vavrušková,, Lenka (referee) ; Gazdič, Dominik (advisor)
The presented bachelor thesis is focused on excitation of a sulfate binder based on anhydrite. The thesis is conceptually divided in a theoretical and experimental part. The theoretical part is devoted to the general theory of sulphate binders and anhydrite mortars, at the same time, there is brought view on process of production of historical gypsum binders as well as the current use of anhydrides. In theoretical part of the thesis, there is included study, which is focused on previous research in presented problematics at the THD institution. In the experimental part of the thesis, which is primarily focused on the method of internal excitement, there is elaborated design and mineralogical analysis of input feedstocks as well as the internal waking process itself with subsequent qualitative evaluation using XRD and REM analysis.
|
|
|
Evaluation of local filler sources suitability for anhydrite-based screeds
Šikral, Martin ; Kaláb, Michal (referee) ; Drochytka, Rostislav (advisor)
Goal of this thesis is to evaluate suitability of local filler sources for anhydrite based screed floor covers. The theoretical part is mostly aimed at summarization of general findings about flooring constructions and about anhydrite itself. The thesis also includes description of primary and secondary raw materials. The goal of this work is to suggest suitable fillers for anhydrite based screed floor covers in accordance with distance from Sika CZ, s.r.o with residence in Brno – Modrice. At the same time this thesis explores possibility of secondary raw materials usage as a replacement of primary fillers. In conclusion the thesis focuses on the laboratory test of chosen fillers, summarization and discussion of discovered findings.
|
|
|
Diagnostics of flooring failures and defects in the housing and civic construction
Vrtal, Roman ; Žítt, Petr (referee) ; Schmid, Pavel (advisor)
The object of the thesis is a description of preparation process, realization and subsequent treatment of floors based on calcium sulphate, including problems related to the issue. The aim of the work is to closely acquaint the reader with methods used in diagnostics of flooring failures and defects in the housing and civic construction, including practical applications of these methods on real structures. The work also includes experimental analysis of a real floor construction during local load effect.
|
guest ::
