<div>Adsorbent technology is widely used in many industrial applications including waste heat recovery, water purification, and atmospheric revitalization in confined habitations. Astronauts depend on adsorbent-based systems to remove metabolic carbon dioxide (CO₂) from the cabin atmosphere; as NASA prepares for the journey to Mars, engineers are redesigning the adsorbent-based system for reduced weight and optimal efficiency. These efforts hinge upon the development of accurate, predictive models, as simulations are increasingly relied upon to save cost and time over the traditional design-build-test approach. Engineers rely on simplified models to reduce computational cost and enable parametric optimizations. Amongst these simplified models is the axially dispersed plug-flow model for predicting the adsorbate concentration during flow through an adsorbent bed. This model is ubiquitously used in designing fixed-bed adsorption systems. The current work aims to improve the accuracy of the axially dispersed plug-flow model because of its wide-spread use. This dissertation identifies the critical model inputs that drive the overall uncertainty in important output quantities then systematically improves the measurement and prediction of these input parameters. Limitations of the axially dispersed plug-flow model are also discussed, and recommendations made for identifying failure of the plug-flow assumption.</div><div><br></div><div>An uncertainty and sensitivity analysis of an axially disperse plug-flow model is first presented. Upper and lower uncertainty bounds for each of the model inputs are found by comparing empirical correlations against experimental data from the literature. Model uncertainty is then investigated by independently varying each model input between its individual upper and lower uncertainty bounds then observing the relative change in predicted effluent concentration and temperature (<i>e.g.</i>, breakthrough time, bed capacity, and effluent temperature). This analysis showed that the LDF mass transfer coefficient is the largest source of uncertainty. Furthermore, the uncertainty analysis reveals that ignoring the effect of wall-channeling on apparent axial dispersion can cause significant error in the predicted breakthrough times of small-diameter beds.</div><div><br></div><div>In addition to LDF mass transfer coefficient and axial-dispersion, equilibrium isotherms are known to be strong lever arms and a potentially dominant source of model error. As such, detailed analysis of the equilibrium adsorption isotherms for zeolite 13X was conducted to improve the fidelity of CO₂ and H₂O on equilibrium isotherms compared to extant data. These two adsorbent/adsorbate pairs are of great interest as NASA plans to use zeolite 13X in the next generation atmospheric revitalization system. Equilibrium isotherms describe a sorbent’s maximum capacity at a given temperature and adsorbate (<i>e.g.</i>, CO₂ or H₂O) partial pressure. New isotherm data from NASA Ames Research Center and NASA Marshall Space Flight Center for CO₂ and H₂O adsorption on zeolite 13X are presented. These measurements were carefully collected to eliminate sources of bias in previous data from the literature, where incomplete activation resulted in a reduced capacity. Several models are fit to the new equilibrium isotherm data and recommendations of the best model fit are made. The best-fit isotherm models from this analysis are used in all subsequent modeling efforts discussed in this dissertation.</div><div><br></div><div>The last two chapters examine the limitations of the axially disperse plug-flow model for predicting breakthrough in confined geometries. When a bed of pellets is confined in a rigid container, packing heterogeneities near the wall lead to faster flow around the periphery of the bed (<i>i.e.</i>, wall channeling). Wall-channeling effects have long been considered negligible for beds which hold more than 20 pellets across; however, the present work shows that neglecting wall-channeling effects on dispersion can yield significant errors in model predictions. There is a fundamental gap in understanding the mechanisms which control wall-channeling driven dispersion. Furthermore, there is currently no way to predict wall channeling effects a priori or even to identify what systems will be impacted by it. This dissertation aims to fill this gap using both experimental measurements and simulations to identify mechanisms which cause the plug-flow assumption to fail.</div><div><br></div><div>First, experimental evidence of wall-channeling in beds, even at large bed-to-pellet diameter ratios (<i>d</i>_bed/<i>d</i>_p=48) is presented. These experiments are then used to validate a method for accurately extracting mass transfer coefficients from data affected by significant wall channeling. The relative magnitudes of wall-channeling effects are shown to be a function of the adsorption/adsorbate pair and geometric confinement (<i>i.e.</i>, bed size). Ultimately, the axially disperse plug-flow model fails to capture the physics of breakthrough when nonplug-flow conditions prevail in the bed.</div><div><br></div><div>The final chapter of this dissertation develops a two-dimensional (2-D) adsorption model to examine the interplay of wall-channeling and adsorption kinetics and the adsorbent equilibrium capacity on breakthrough in confined geometries. The 2-D model incorporates the effect of radial variations in porosity on the velocity profile and is shown to accurately capture the effect of wall-channeling on adsorption behavior. The 2-D model is validated against experimental data, and then used to investigate whether capacity or adsorption kinetics cause certain adsorbates to exhibit more significant radial variations in concentration compared than others. This work explains channeling effects can vary for different adsorbate and/or adsorbent pairs—even under otherwise identical conditions—and highlights the importance of considering adsorption kinetics in addition to the traditional <i>d</i>_bed/<i>d</i>_p criteria.</div><div><br></div><div>This dissertation investigates key gaps in our understanding of fixed-bed adsorption. It will deliver insight into how these missing pieces impact the accuracy of predictive models and provide a means for reconciling these errors. The culmination of this work will be an accurate, predictive model that assists in the simulation-based design of the next-generation atmospheric revitalization system for humans’ journey to Mars.</div>

An experimental and numerical investigation has been conducted to examine steady, internal, nozzle-generated, gas/liquid mist cooling in vertical channels with ultra-thin, evaporating subcooled liquid films. Interest in this research has been motivated by the need for a highly efficient cooling mechanism in high-power lasers for inertial fusion reactor applications. The aim is to quantify the effects of various operating and design parameters, viz. liquid atomization nozzle design (i.e. spray geometry, droplet size distribution, etc.), heat flux, liquid mass fraction, film thickness, carrier gas velocity, temperature, and humidity, injected liquid temperature, gas/liquid combinations, channel geometry, length, and wettability, and flow direction, on mist cooling effectiveness. A fully-instrumented experimental test facility has been designed and constructed. The facility includes three cylindrical and two rectangular electrically-heated test sections with different unheated entry lengths. Water is used as the mist liquid with air, or helium, as the carrier gas. Three types of mist generating nozzles with significantly different spray characteristics are used. Numerous experiments have been conducted; local heat transfer coefficients along the channels are obtained for a wide range of operating conditions. The data indicate that mist cooling can increase the heat transfer coefficient by more than an order of magnitude compared to forced convection using only the carrier gas. The data obtained in this investigation will allow designers of mist-cooled high heat flux engineering systems to predict their performance over a wide range of design and operating parameters. Comparison has been made between the data and predictions of a modified version of the KIVA-3V code, a mechanistic, three-dimensional computer program for internal, transient, dispersed two-phase flow applications. Good agreement has been obtained for downward mist flow at moderate heat fluxes; at high heat fluxes, the code underpredicts the local heat transfer coefficients and does not predict the onset of film rupture. For upward mist flow, the code underpredicts the local heat transfer coefficients and, contrary to experimental observations, predicts early dryout at the test section exit.

L’étude du long poème épique de Lion de Bourges permet de mettre en évidence un parcours individuel modelé par la recherche d’un ordre politique et féodal, au sein duquel le héros tente d’inscrire son action, celle d’un ordre familial, au travers du lignage et de la parentèle, et celle d’un ordre personnel, à la fois recherche des origines et du père, qui devient une quête d’identité. L'idéal chevaleresque s’inscrit donc dans trois perspectives complémentaires. C’est d’abord face à l’instabilité des structures et du pouvoir royal, l’aspiration au rétablissement d’un ordre politique, mais l’inachèvement des actions entreprises et la constante réapparition du mal font que cette quête de l’ordre reste imparfaite. C’est ensuite l’effort pour la restauration d’un ordre familial mis à mal par les entreprises des traîtres et les aléas de l’aventure, mais là encore l’engagement et les efforts du héros ne permettent d’obtenir que des résultats imparfaits ou insatisfaisants. C’est donc à un niveau supérieur, dans la quête d’un ordre intérieur et dans un élan vers la perfection que l’itinéraire personnel de Lion de Bourges peut trouver son véritable sens. Cependant, son ultime tentative pour s’approcher du sacré ne conduit qu’à un échec : le contact avec le surnaturel chrétien est réservé au personnage du Blanc Chevalier, revenant secourable, et le héros doit se contenter d’une forme intermédiaire de merveilleux féerique. En définitive, ce poème témoigne, de manière originale et fort cohérente, de la vision pessimiste de l’idéal humain et de l’engagement héroïque, qui devient prédominante dans l’épopée française tardive. / The long epic poem Lion de Bourges portrays the personal quest of a hero, first, to set in order a feudal political structure; then his own family structure (through ancestry and parentage); and finally, his personal life; for seeking his origins and father becomes a search for his own identity. The chivalric ideal therefore is seen through three complementary perspectives. Initially, when faced with the instability of social structures and royal power, Lion seeks to re-establish political order, but both Lion’s inability to complete his goals and the constant reappearance of evil cause this quest to remain incomplete. Afterwards, Lion’s effort to bring his family back together is derailed by traitors’ plots and the fortunes of adventure, so there again the hero’s efforts produce only imperfect or unsatisfactory results. It is thus only at the highest level, the quest for personal order, for spiritual perfection, that the private itinerary of Lion de Bourges might find its true goal. However, his last desire, to reach sanctity, leads to failure as well: contact with the Christian supernatural is reserved for the White Knight, a helpful spirit, and the hero must content himself with a lesser form of supernatural, the enchanted marvelous world. Clearly, this poem demonstrates, in an original and highly consistent way, the pessimistic view of the human ideal and of heroic engagement that predominates in late French epic.

Em um cenário de aumento de competitividade, crescente expectativa por inovações do produto e necessidade de atender diferentes perfis de consumidores, o conceito de gerenciamento de cadeias de suprimentos globais (GSCM) surge como uma estratégia para coordenar mais eficazmente as atividades dispersas geograficamente dos sistemas produtivos. Na adoção do GSCM, as organizações devem lidar com rupturas que impactam no gerenciamento das suas atividades, tais como a interrupção de vias de transporte, pane no fornecimento de energia, desastres naturais e até ataques terroristas. Nesse contexto, o trabalho introduz um procedimento sistematizado para modelagem das cadeias de suprimentos visto como um sistema a eventos discretos e sua análise por simulação das atividades do GSCM baseada em técnicas formais como a rede de Petri (PN) e o Production Flow Schema (PFS). Um exemplo é também apresentado para ilustrar e comprovar as vantagens do método proposto na análise do GSCM. / In a context of increasing competition, rising of expectations for product innovations and need to satisfy different consumer needs, the concept of global supply chain management (GSCM) emerges as a strategy to more efficiently coordinate the geographically dispersed activities of production systems. Adopting GSCM, organizations have to deal with external disruptions that impact management activities, such as transport interruption, power supply failure, natural disasters and terrorist attacks. In this way, a systematized procedure for modeling supply chains as a discrete event system and simulation analysis of GSCM activities based on formal techniques, such as Petri net (PN) and Production Flow Schema (PFS) is introduced. An example is also presented to illustrate and confirm the advantages of the proposed method for GSCM analysis.

Orientador: Daniel Mário Ugarte / Tese (doutorado) - Universidade Estadual de Campinas, Instituto de Fisica Gleb Wataghin / Made available in DSpace on 2018-08-17T20:15:26Z (GMT). No. of bitstreams: 1 Tizei_LuizHenriqueGalvao_D.pdf: 12237887 bytes, checksum: e97ac7041ecfd4c30088cf9b43d9849a (MD5) Previous issue date: 2011 / Resumo: O desenvolvimento de novos materias tem grande interesse devido à ocorrência de novos fenômenos e propriedades, as quais podem ser usadas em futuras aplicações tecnológicas. Em particular, nas últimas décadas, esforços imensos foram realizados buscando compreender nanomateriais e os efeitos da redução de tamanho e de dimensão. Entre os diferentes avanços alcançados, podemos citar o desenvolvimento significativo de nanofios semicondutores (estruturas quasi-unidimensionais) com dezenas ou centenas de nanometros de espessura e milhares de nanometros de comprimento. O método mais utilizado para o crescimento de nanofios é o método catalítico chamado VLS (Vapor-Líquido-Sólido), no qual uma nanopartícula metálica serve como sorvedouro preferencial de átomos de um vapor e, também, como posição para a formação de um sólido (nanofio). O VLS foi proposto por Wagner e Ellis nos anos 60. Em nossos trabalhos, nos concentramos no estudo de nanofios de semicondutores III-V crescidos em um reator de Epitaxia de Feixe Químico (CBE) catalisados por nanopartículas de Au. Mais especificamente, estudamos nanofios de InP, InAs, InGaP, InAsP e heteroestruturas InP/InAs/InP. Como a qualidade de interfaces e homogeneidade química do material crescido, influenciam diretamente as propriedades ópticas e elétricas de nanofios, nossa pesquisa nos levou a avaliar os limites da aplicação de diversas técnicas de microscopia eletrônica de transmissão aplicadas: TEM (Microscopia Eletrônica de Transmissão), STEM (Microscopia Eletrônica de Transmissão em Varredura), HRTEM (Microscopia Eletrônica de Transmissão de Alta Resolução), EDS (Espectroscopia de Raios-X Dispersados em Energia) e EELS (Espectroscopia de Perda de Energia de Elétrons). Como consequência, determinamos os limites de detecção de variações químicas e de medidas de larguras de interfaces das diferentes técnicas. Em particular, devido às limitações impostas pelo dano por radiação no material, propusemos o uso de deslocamentos químicos de plasmons (EELS) para a caracterização química de nanoestruturas de semicondutores III-V. Desenvolvemos uma metodologia para a análise de seções transversais de nanofios de InAsP. Os experimentos realizados indicam a diferença entre os semicondutores produzidos por crescimento axial (catalítico) e por radial (bidimensional). Além disso, a análise química detalhada de heteroestruturas InP/InAs/InP levou a detecção de concentrações inesperados de As no segmento final de InP. Interpretamos esta observação como uma indicação de que As difunde através da nanopartícula catalisadora durante o crescimento, demonstrando uma rota de incorporação de elementos do grupo V em nanofios crescidos pelo método VLS. Finalmente, estudamos os efeitos de defeitos estruturais extendidos, como discordâncias na morfologia e distorções estruturais de nanofios. Neste sentido, observamos a torção de Eshelby em nanofios de InP contendo discordâncias em parafuso únicas. Nossos resultados mostram que as taxas de torção medida são muito maiores (até 100%) do que o previsto pela teoria elástica macroscópica. Isto mostra as mudanças significativas nas propriedades mecânicas e estruturais em nanoestruturas e ilustra o papel importante de estudos detalhados de microscopia eletrônica para a análise de deformações em nanoestruturas / Abstract: The development of new materials has great interest due to the possibility of finding new phenomena and properties, which can be used in technological applications. In particular, in the last decades, huge efforts have been made in order to understand nanomaterials and, the effects of size and dimensionality reduction. Among different advances, it is worth noting the significant development of semiconductor nanowires (quasi-one dimensional structures) with tens or hundreds of nanometers in diameter and thousands of nanometers in length. The catalytic method VLS (Vapor-Liquid-Solid) is the most used approach for nanowire preparation, in which a metal nanoparticle serves as a preferential sink for atoms from a vapor and, also, as the position for the solid nucleation; this method was proposed by Wagner and Ellis in the 60s. In our work, we have focused on the study of III-V semiconductor nanowires grown by Chemical Beam Epitaxy (CBE) catalyzed by Au nanoparticles. Specifically, we have studied different III-V nanowires (InP, InAs, InGaP and InAsP), as ell as, some heterostructured wires (InP/InAs/InP). As the quality of interfaces and the chemical homogeneity of materials directly influence the optical and electrical properties of nanowires, our research have led us to assess the limit of applicability of several characterization techniques based on transmission electron microscopy: TEM (Transmission Electron Microscopy), STEM (Scanning Transmission Electron Microscopy), HRTEM (High Resolution Transmission Electron Microscopy), EDS (Energy Dispersed X-Ray Spectroscopy) and EELS (Electron Energy Loss Spectroscopy). As a consequence, we have determined the detection limit for the measurement of chemical composition variations and interface widths. In particular, due to the limitations imposed by radiation damage on III-V nanowires, we have proposed the use of Plasmon chemical shifts (EELS) to the chemical characterization of III-V nanostructures. We have analyzed the cross sections of InAsP nanowires and we have been able to reveal a difference between the semiconductors materials produced by the axial (catalytic) and radial (bidimensional) growth. Through the detailed chemical analysis of InP/InAs/InP heterostructures we have detected an unexpected concentration of As in the last InP segment of the heterostructure. We have interpreted this result as an indication that As diffuses through the catalytic nanoparticle during growth. This demonstrates an incorporation route for group V atoms in nanowires grown by VLS. Finally, we have studied the effects of extended structural defects, like dislocations, in the morphology and structural distortions of nanowires. In this sense, we have observed the Eshelby twist in InP nanowires containing a single screw dislocation. Our results show that measured twist rates are much larger (up to 100%) than the predictions from the elasticity theory. This shows the significant change of mechanical and structural properties in nanoscale and, illustrates the important role of a careful electron microscopy studies to analyze deformations in nanostructures / Doutorado / Física da Matéria Condensada / Doutor em Ciências

Submitted by Renata Lopes (renatasil82@gmail.com) on 2017-04-20T13:39:03Z No. of bitstreams: 1 pedromachadodealmeida.pdf: 13436160 bytes, checksum: 84c66613dade0766ae9ea2bdc8be9f91 (MD5) / Approved for entry into archive by Adriana Oliveira (adriana.oliveira@ufjf.edu.br) on 2017-04-20T14:45:37Z (GMT) No. of bitstreams: 1 pedromachadodealmeida.pdf: 13436160 bytes, checksum: 84c66613dade0766ae9ea2bdc8be9f91 (MD5) / Made available in DSpace on 2017-04-20T14:45:37Z (GMT). No. of bitstreams: 1 pedromachadodealmeida.pdf: 13436160 bytes, checksum: 84c66613dade0766ae9ea2bdc8be9f91 (MD5) Previous issue date: 2011-04-29 / Esta dissertação apresenta uma estratégia de controle para sistemas de geração fotovoltaicos, de único estágio, trifásicos, conectados à rede elétrica de distribuição. São desenvolvidos modelos matemáticos para representar as características dinâmicas dos painéis fotovoltaicos, do conversor fonte de tensão (VSC -“Voltage Source Converter”) e da rede de distribuição. A modelagem do sistema de geração disperso (SGD) é feita no sistema de coordenadas síncrono (dq), fornecendo um sistema de equações diferenciais que pode ser usado para descrever o comportamento dinâmico do sistema quando as tensões da rede estão equilibradas ou desequilibradas. O conversor é controlado no modo de corrente, através da estratégia de modulação vetorial (Space Vector Modulation - SVM). São projetadas duas malhas de controle em cascata para controlar o conversor estático. A malha interna controla a corrente injetada na rede enquanto que a externa controla a tensão no barramento CC do conversor. O controle da tensão CC permite rastrear o ponto de máxima potência do painel PV além de controlar a quantidade de potência ativa injetada na rede CA. Um método ativo de detecção de ilhamento baseado na injeção de corrente de sequência negativa é incorporado ao sistema de controle. Resultados de simulações digitais obtidos com o programa ATP (Alternative Transient Program ) são utilizados para validar os modelos matemáticos e as estratégias de controle. Finalmente, um protótipo experimental de pequena escala é montado em laboratório. Todo o sistema de controle do protótipo experimental foi implementado no DSP TMS320F28212. Os resultados obtidos demonstram o funcionamento do sistema e podem ser usados para validar a estratégia de controle utilizada. / This dissertation presents a control strategy for a single-stage, three-phase, photovoltaic systems to be connected to a distribution network. Mathematical models are developed to represent the dynamic characteristics of the photovoltaic panels, the voltage-source converter (VSC) and the distribution network. The modeling of the dispersed generation system (DGS) is done in the synchronous reference frame (dq), providing a system of differential equations that describes the dynamic behavior of the system when the network voltages are balanced or unbalanced. The converter is controlled in current mode through the space vector modulation (SVM) strategy. Two control loops are designed to control the static converter. The inner loop controls the injected current into the network while the external loop controls the converter DC bus voltage. The DC voltage regulator allows to track the PV maximum power point and to control the active power injected into the AC grid. An active islanding detection method based on negative-sequence current injection is incorporated into the control system. Digital simulations results obtained with Alternative Transients Program (ATP) is used to validate the mathematical models and the control strategies. Finally, a small-scale experimental prototype is implemented in the laboratory. The whole control system of the experimental prototype was programmed in DSP TMS320F2812 of Texas Instruments. The results demonstrate that the operation of the system can be used to validate the applied control strategy.

Les écoulements diphasiques jouent un rôle prépondérant dans les moteurs-fusées à ergols liquides cryogéniques, équipant par exemple les lanceurs de la famille Ariane. L'étude expérimentale de tels engins propulsifs étant complexe et onéreuse, disposer d'outils numériques à même de simuler fidèlement leur fonctionnement se révèle être un objectif aussi important qu'ambitieux. La difficulté majeure réside dans le caractère fortement multi-échelles du problème, si bien qu’aucune approche numérique existante n'est capable à elle seule de décrire parfaitement l'ensemble des échelles liquides. Partant de ce constat, les travaux présentés dans cette thèse visent à mettre en place une stratégie de couplage entre des modèles bien adaptés aux différentes topologies d'écoulement diphasique, et ce dans le cadre de la plateforme logicielle multi-physique CEDRE développée par l'ONERA. La démarche adoptée consiste précisément à coupler un modèle à interface diffuse de type ``4 équations'' pour les zones à phases séparées, et un modèle cinétique eulérien pour la phase dispersée, rendant ainsi possible la description de l’atomisation primaire. Par ailleurs, les conditions sévères qui règnent dans les moteurs cryotechniques, où de forts gradients de température, vitesse et densité sont rencontrés, mettent à l'épreuve la robustesse des méthodes numériques. Une nouvelle méthode MUSCL multipente pour maillages non structurés généraux a ainsi été développée, permettant d’améliorer la robustesse et la précision des schémas de discrétisation spatiale. L’ensemble de la stratégie de couplage est finalement appliquée à la simulation du banc Mascotte de l'ONERA pour la combustion cryotechnique. / Two-phase flows play a significant role for the proper functioning of cryogenic liquid-propellant rocketengines, such as those that equip the launchers of the Ariane family. Since the experimental investigationof such propulsion devices is complex and expensive, developing numerical tools able to accuratelysimulate their functioning, is a crucial but nonetheless ambitious objective. The major difficulty is due tothe multiscale nature of the problem, as a result of which there is currently no numerical approach ableto perfectly describe all the liquid scales on its own. Based on this observation the work presented in thisthesis aims at setting up a coupling strategy between models well-adapted to each two-phase flowtopology, in the framework of the ONERA’s multiphysics CEDRE software. The approach adoptedprecisely consists in coupling a 4-equation diffuse interface model for the separated phases and aeulerian kinetic model for the dispersed phase, thus making it possible to describe primary atomization.Besides, the harsh conditions within cryogenic rocket engines, where large temperature, velocity anddensity gradients are encountered, severely challenge the robustness of numerical methods. A newmultislope MUSCL method for general unstructured meshes is thus developed in order to improve therobustness and accuracy of space discretization schemes. The whole coupling strategy is finally appliedto the numerical simulation of the ONERA’s Mascotte test bench for cryogenic combustion research.

The diploma thesis is focused on fire-resistant repair mortar with fine-grained filler. The aim of this work is the research and development of fine-grained Mortars resistant to high temperatures, which are characteristic at the beginning of the fire. The theoretical knowledge with subsequently realized laboratory verification was used. At-tention was paid to the masses based on the mixed binder comprising cement and blast furnace slag, respectively. high-temperature ash. Cellulose fibres were used as the dis-persed reinforcement. Two kinds of aggregate were assessed - fly ash agloporit and am-phibolite incl. combinations thereof. Laboratory tests were carried out via determination of basic material properties (density, strength, consistency, dimensional changes etc.) after exposure to extreme temperatures. A substantial part of the research was also study of different cooling conditions - slow and fast (water and air). Selected formulations were subjected to temperatures up to 1200 ° C. In the conclusion is selected several recipes that have been found to be optimal for continuing research on the basis of the results and findings.

This dissertation deals with the study of durability and degradation repair mortars for reinforced concrete structures. In its theoretical part, there are the research findings on the behavior of repair mortars exposed to corrosive environments with different exposure time and selected high temperatures. Processes occurring in repair mortars during their loading at high temperatures or when exposed to chemically aggressive environments are described, We can find recipes designed for cementitious binder based with a specific replacement using slag or fly ash in its practical part. The object of the research was to determine the durability of the proposed repair mortars, and determine their suitability for use on concrete structures, which may be exposed to a synergistic effect of chemically aggressive environments with high temperatures simulating fire.

The diploma thesis is focused on polymercement materials with dispersed reinforcement. The aim of this work is development of suitable polymercement mixture and monitoring of the impact of dispersed reinforcement on the course of maturation of these materials and physico-mechanical properties. The effect of high temperatures on the properties of the mortar is also examined. Emphasis is placed on the use of alternative resources and byproducts. Mixed binder of cement and slag and admixture of microsilica was used. Recycled cellulose was used as dispersed reinforcement and was compared with commercial polypropylene fibers.