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Evaluation of properties of lime mortars
Babíková, Barbora ; Švec, Jiří (referee) ; Opravil, Tomáš (advisor)
This bachelor thesis deals with evaluation of properties of lime mortars and their application in field of restoration and preservation of cultural heritage. The aim of this works is to compile evaluation line of different types of lime mortars based on comparison of their behavior during testing of their characteristic properties and resistance. Studied properties like setting time, compressive strength, tensile strength in bending, frost resistance, reactivity, content of free lime, loss of mass on ignition, point to applicability of given mortar in different interior or exterior conditions. The results of individual tests are further processed and evaluated.
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Effect of water-lime ratio on the properties of lime mortars.
Kurfürstová, Nela ; Vyšvařil, Martin (referee) ; Rovnaníková, Pavla (advisor)
Diploma thesis gives a brief description of the traditional technology of preparation of lime mortars for restoration of historical buildings. The theoretical part is focused on the preparation of lime mortars traditional methods, using appropriate materials for making and influence amount of water. Attention is also paid to the events that take place in the setting and hardening of lime mortar. In the experimental part of the research was conducted, which aimed to assess the influence of water-cement ratio and mixing ratio (binder to filler) on the properties of lime mortars. At various times were measured mechanical properties, density, shrinkage, frost resistance and porosity. The mortar was also carried out thermal analysis and found to contain calcium carbonate. Acquired knowledge could help in the reconstruction of historical buildings.
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Plasters modified by burnt clays
Soukupová, Eva ; Příhoda,, Jiří (referee) ; Sokolář, Radomír (referee) ; Michoinová,, Dagmar (referee) ; Rovnaníková, Pavla (advisor)
The doctoral thesis deals with the reactivity of burnt clays in connection with modified lime mortars. The theoretical part of the doctoral thesis provides an overview of the properties of lime mortars, their quality and ways of their degradation. The different types of burnt clays (brick powder, bentonites and burnt clay shale), their origin, properties and factors affecting their reactivity and methods of its evaluation are stated. The properties and reactivity of burnt clays are evaluated on the basis of determination of pozzolanic activity, mineralogical and chemical composition, surface area, density, content of the amorphous phase and granulometry in the experimental part of the doctoral thesis. The compositions of lime mortars containing burnt clays and evaluation of an impact of burnt clay on the properties of mortars in the fresh and hardened state are given. Consistency, bulk density, workability and air content of mortars in the fresh state are evaluated. Strength characteristics depending on the time, water absorbability, porosity, capillary attraction, adhesion, coefficient of diffusion resistance, frost resistance, shrinkage, mineralogical composition and microstructure of mortars in the hardened state are evaluated. Attention is also paid to the influence of the cellulose ether addition into the modified lime mortars.
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Mounting frame structures of production and warehouse complex in Paskov
Gaďurek, Robin ; Nečasová, Barbora (referee) ; Vlčková, Jitka Laura (advisor)
The content of the submitted thesis is the implementation of a reinforced concrete skeleton assembled in Paskov. This is a manufacturing and warehouse facility Italinox. The work contains a comprehensive technical report, technical report transport relations, bills of quantities, two technological regulations, two control and test plans, design of mechanical assemblies, and health and safety. The appendix contains drawings framed construction and piloting, budget, schedule, drawing of the site.
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Methods of Indetification of Historic Mortars
Kurfürstová, Nela ; Bayer, Patrik (referee) ; Rovnaníková, Pavla (advisor)
The thesis is describing short survey on metods to help identify individual components that was used in the history for the production of mortar. The work is focused especially for plaster whose main binder is lime. The lime was in the past used to mortatrs to improve the properties for example adhesion to the substráte, workability, hygrophobic and more. The aim of practical part was to analyze the obtained historical mortar according to the methods mentioned in the theoretical part – determining individual components contained in historical mortar, composition ratio and proposal for the composition of the repair mortars. These knowledge can to help for reconstrution of historical objects.
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Strengthening of weak historic renders with traditional and innovated consolidation treatment
Slížková, Zuzana ; Frankeová, Dita
The presented study was aimed to proof consolidation effects of different families of consolidants: inorganic agents (lime -based or silica-based solutions or sols), organic agents (silicic acid ester based consolidant) and their combination on the characteristics of weak mortars prepared in laboratory with different types of aggregates. Besides exploring consolidant-substrate interaction also the pozzolanic activity of the aggregate and the binder mortar component after reaction with lime (calcium hydroxide solution) was investigated in order to understand and describe the strengthening mechanism into consolidated mortars. As the study was based on experimental research, the production of mortar test specimens represented an important preliminary work. Different mortar components (various types of sand in terms of phase composition, clay, lime) and the same ratio of the aggregate and the binder were used in various mortar mixtures. Various mineralogical types of aggregate were used with the same grain size distribution (600 pieces of tubes of 40 mm in outer diameter, of the height of 40 mm and depth of 4 mm were prepared for testing the compressive strength, for the tension tests 550 thin plates of dimensions 40 mm x 100 mm x 4 mm were cast and 600 beams 20 x 20 x100mm were made for testing the flexural strength and other characteristics of reference and consolidated mortars). The sand used for mortar specimens was characterized by microscopic examination of thin section and also by X-ray diffraction, X-ray fluorescence spectroscopy and thermal analysis. The pozzolanic activity of the sands (reactivity with calcium hydroxide) was determined by means of the thermal analysis and supplemented by wet silicate analysis. The amount of the effective matter in the consolidant was the same for all agents per the square unit for all mortar types and specimen shape. One set of specimens was prepared as the reference set the second set was used for the evaluation.
Fulltext: content.csg -  PDF
Plný tet: 0443951_2015_Slizkova_Frankeova_Strengthening_of_weak_historic_renders_with_traditional_and_innovated_consolidation_treatment - PDF
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