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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
11

Studium vlastností vápenných malt pro obnovu omítek historických staveb / Investigation of the properties of lime mortars for the renovation of historical building plasters

Kolouchová, Eliška January 2015 (has links)
The theoretic part of this diploma thesis interprets historical procedures of lime mortar manufacturing and modern options for the historical lime plaster renovation. The experimental part of this diploma thesis aims for the comparison of physical-mechanic characteristic of lime mortar manufactured with different kinds of lime. The main goal is verifying of positive influence of using the aged lime mortar on its physical-mechanic characteristics.
12

Recherches sur la datation directe de la construction des édifices : exploration des potentialités de la datation des mortiers archéologiques par luminescence optiquement stimulée (OSL) / Researches on direct dating of constructions : Investigations of the potentials of Optically Stimulated Luminescence to date archaeological mortars

Urbanová, Petra 27 November 2015 (has links)
La datation directe de l’édification de maçonneries est l’objectif archéologique majeur de cette thèse qui s'inscrit dans un contexte interdisciplinaire. Il s’agit de mettre au point une méthode de datation des mortiers, matériaux de choix beaucoup plus représentatifs de la chronologie de l’édification que les briques ou les bois de charpentes qui peuvent être remployés. Les mortiers de chaux, constitués d'un mélange de chaux et de sable, peuvent être datés par luminescence optiquement stimulée : il s’agit en effet de remonter à la fin de la dernière exposition à la lumière des grains de sable qui ont été ajoutés à la chaux par les anciens bâtisseurs, ce qui correspond précisément à la fabrication du mortier au moment de l’édification. Les monuments datés dans ce travail forment un ensemble d’édifices de référence s'étendant de l'Antiquité gallo-romaine jusqu'à la fin du Moyen Âge, bien calés chronologiquement par les approches chronologiques indépendantes. L’objectif est de comparer la chronologie obtenue par OSL à celle connue et démontrer ainsi la validité de la méthode. La procédure de datation des mortiers par OSL est compliquée par plusieurs facteurs. D’abord, le blanchiment optique des grains de quartz du mortier n’est pas uniforme en raison de l’éventuelle faible durée d’exposition à la lumière. En plus, une faible ancienneté des objets à dater (2000 ans au maximum) implique des signaux de faible amplitude et la nécessité d’adapter le protocole de mesure. Enfin, particulièrement les mortiers grossiers peuvent être affectés par les effets microdosimétriques. Ces facteurs sont pris en compte dans le choix de méthodologie de datation qui comprend ainsi les étapes suivantes : la caractérisation du mortier par microscopie optique, par EDX-MEB et par imagerie beta, la mesure des doses archéologiques individuelles par la technique de monograin, la détermination de la dose annuelle et le calcul de la dose archéologique ou bien de l’âge. Cette dernière est une étape délicate car il s’agit de sélectionner dans les distributions des doses archéologiques individuelles les grains bien blanchis qui portent une information chronologique recherchée. Pour cela, les différentes approches statistiques habituellement utilisées en datation par luminescence sont testées. Cette thèse apporte une démonstration de la méthode et montre que dans de nombreux cas, elle peut produire des dates fiables. L’analyse individuelle de chaque grain est ici un seul moyen permettant d’obtenir des informations exactes sur la vraie nature du matériau étudié. / The heart of the proposed research lies in the possibilities of direct dating of historical constructions, the interdisciplinary issues of a high significance. The aim of this research is to put into practice a dating method dealing with mortars, the category of materials more convenient and much more representative for the chronology of buildings in comparison with bricks or wood constructions that may be reused. Lime mortars composed of the mixture of sand and lime can be dated by optically stimulated luminescence: the objective is to determine the last moment when the grains of sand have been exposed to light which corresponds exactly with the fabrication of the mortar at the moment of building. The monuments dated within this PhD. thesis constitute a group of reference structures from the Gallo-Roman antiquity to the Middle Ages well-dated by other independent chronological approaches. The objective is to compare the chronology obtained by OSL with the known one and thereby to proof the validity of the method. The OSL dating procedure of mortars is complicated by numerous factors. First of all, due to the short exposure to light the optical bleaching of quartz grains in mortar is not homogeneous. In addition, the young age of dated material (maximally 2000 years old) implies signals of a weak intensity and the necessity to adapt conveniently the measurement protocol. Finally, especially the coarse-grained mortars can be affected by the microdosimetric effects. All these factors are taken into account when selecting a convenient dating methodology comprising the following stages: characterization of mortar by optical microscopy, by SEM-EDX and by beta autoradiography, the measurement of individual archaeological doses by the single grain technique, the determination of the annual dose and the calculation of the archaeological dose and of the age. The latter stage is a tricky one; it is necessary to select from the measured distribution of archaeological doses the well-bleached grains that contain the right chronological information. In this context, different statistical approaches usually used in luminescence dating are tested. This thesis brings a demonstration of the OSL dating method and shows that in many cases we can get reliable dates. The individual analysis of each grain is here the only way how to get the precise information about the nature of the studied material.
13

Vliv použitého kameniva na vlastnosti vápenných malt / The effect of aggregate type on the properties of lime mortar

Žižlavský, Tomáš January 2017 (has links)
The thesis is focused on the comparison of the role of different types of aggregates and the binder-aggregate ratio on the properties of lime mortars. The theoretical part of the thesis deals with the effect of properties of aggregate, a binder-aggregate ratio and a use of calcareous aggregate, especially limestone, on the properties of mortars. It also deals with the utilization of limestone as aggregate in a history of masonry. In the practical part of the thesis there is a comparison of physically-mechanical and microstructural properties of mortars prepared with different type of aggregate (siliceous sand and limestone aggregate), with varying binder-aggregate ratio and also with a partial substitution of the aggregate by limestone fines. It was found that the usage of limestone instead of quartz sand produces the mortar of comparable properties. The partial substitution of the aggregate with limestone fines caused noticeable growth of strength, especially in mortars with higher binder-aggregate ratio.
14

Vliv vodního součinitele na vlastnosti vápenných malt / Effect of water-lime ratio on the properties of lime mortars.

Kurfürstová, Nela January 2016 (has links)
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.
15

Polyfunkční koncový dům v Karlových Varech / Multifunctional house in Karlovy Vary

Růžička, Jiří January 2017 (has links)
The project solves a multifunctional Duma building in a vacant lot, contemplated the construction site is located in Carlsbad, in the street Vyhlíce. This is a protected site spa. Part of the project's layout and structural design of the house. It is a six-storey house with an attic and a basement floor. It is designed as a free-standing in the gap as the final house. The layout is divided into two complete units with their own input. There are spaces for business and residential units for permanent housing. Part of the living area are also room house equipment. Inputs to both parts are wheelchair accessible. The house is not wheelchair The house is designed as a brick building of brick masonry Porotherm the module dimensions of 250 (125) mm with reinforced concrete ceilings. Roofed by a hipped roof. The house is located on a private plot of 519 m2 built-up area of 221 m2. The land is gently sloping. The main orientation of the building to the cardinal's east and west. The south wall is adjacent to the neighboring house.

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