Solved area is located in the center of Vyškov and is directly connected to the square. It forms one end of the chip Square. The proposal was to create a dominant object, which will close the square and end with the visual axis, which in recent years is not very flattering. The building would be dominant, but only so that did not compete with dominant main square, with the town hall. At the same time the goal was to design a functional building, which, thanks to the cartridge housing, shops and bring more people into the center and revive him.

De nos jours, une gestion optimale de l'énergie électrique est devenue un enjeu majeur. La conversion de l'énergie entre une source et sa charge est réalisée par un élément central : le convertisseur statique utilisé aussi bien pour des faibles puissances (quelques Watts) que pour des très fortes (plusieurs MWatt). La brique élémentaire est la cellule de commutation constituée de semi-conducteurs de puissance (à commutation commandée ou spontanée) généralement réunis au sein d'un " module de puissance ". La nécessaire réduction des volumes dans certaines applications (comme les systèmes embarqués par exemple) ainsi que l'augmentation des calibres de tensions des nouveaux semi- conducteurs grands gaps auront comme conséquence directe d'augmenter les contraintes sur les systèmes d'isolation des convertisseurs. Une répartition contrôlée de ces contraintes dans le volume présente alors un intérêt pour maintenir la fiabilité du système d'isolation. Il est donc nécessaire d'effectuer une caractérisation la plus large possible de l'ensemble des matériaux isolants utilisés dans le packaging des dits " modules de puissance ", ainsi qu'une bonne compréhension de leurs mécanismes de défaillances. Le travail présenté ici consiste en l'étude d'une nouvelle stratégie de répartition du potentiel dans le volume appelée gradation de potentiel. L'isolation de volume développée est un assemblage multicouche constitué d'un matériau à conductivité contrôlée (Epoxy/Graphene) jouant le rôle de gradateur et d'une fine couche isolante (parylène) assurant la tenue en tension. Différents outils, tant théoriques (simulation) qu'expérimentaux, ont été ainsi utilisés pour aider au dimensionnent du système d'isolation électrique. La modélisation par la méthode des éléments finis (MEF) permet-elle de prédéterminer la répartition de la contrainte (potentiel et champ électrique) dans une structure de test prédéfini ou de décrire l'étude de l'influence de la conductivité du matériau gradateur et de l'épaisseur du film sur la répartition des équipotentielles. D'un point de vue expérimental le film sélectionné a été caractérisé pour des épaisseurs comprises entre 10 et 40 µm. Le matériau à conductivité contrôlée a été ensuite élaboré puis caractérisé pour différents taux de chargement. Après l'incorporation du système d'isolation dans différentes structures tests (substrats métallisés et structure double face), différentes méthodes permettant de caractériser le système d'isolation ont été utilisées qu'il s'agisse de mesures directes de la contrainte électrique par sonde à champ nul (potentiel de surface) ou indirectes par des mesures de décharges partielles. L'isolation multi-couches présente des améliorations dans la répartition du potentiel mais aussi des limites d'utilisation en fonction de la conductivité du matériau gradateur. Cette isolation doit donc être dimensionnée au plus près des caractéristiques d'utilisation et offre une approche intéressante pour le dimensionnement des modules de puissances double face. / Nowadays, an optimal management of the electrical energy becomes a key point in electric systems. The conversion of energy is realized by a main component: the power converter. It is used as well for low power (few Watts) as for very high power (MWatts). The elementary block of the converters, is the switching cell made up of semiconductor power devices. The trend to reduce both the volume and the weight in many applications (for example in embedded systems) and the increase of the rating voltage of the new wide band gap semiconductors will have for consequence an increase of the stresses on the electrical insulating systems of the power module . A controlled grading of these electrical constraints in the volume is highly interesting to ensure the reliability of the system. It is therefore necessary to perform a precise characterization of the insulated materials used in the packaging of the power modules, as well as to get a good understanding of their failures mechanisms. The works presented in this dissertation consists in the study of a new strategy for the field gradation in power modules. The proposed insulation is an assembly of multi-layers made up of a thick material of electrically controlled conductivity (Epoxy/Graphene nanocomposite) and of a thin insulating layer (Parylene films). Various tools were used (both theoretical and experimental) to help dimensioning of the Electrical Insulation System (EIS). The Finite Element Method (FEM) was used to simulate the equipotential and field distribution in the structure under study and to analyse on one hand, the influence of the changes in the conductivity values of the Epoxy/Graphene nanocomposite materials and, on the other hand, the impact of the parylene (PA) films thickness on the stress grading. From an experimental point of view, the PA films were characterized for different thicknesses ranging between 10 µm and 40 µm. The Epoxy/Graphene nanocomposites of controlled conductivity were manufactured and characterized (0 to 5 % wt) for various filler contents. The field grading effects were evaluated directly in different structures thanks to surface potential measurements and (indirectly) to partial discharges measurements. The proposed multilayer EIS exhibits some improvements regarding the stress grading but also some limits depending on the conductivity of the nanocomposite. Such an EIS will have to be dimensioned taking into account the rating voltage and could offer an interesting approach for the future design of the power modules.

The shear strength, elastic moduli and plastic strain characteristics of scaled-down ballast materials are investigated by use of the parallel gradation technique. Uniformly graded ballast materials chosen for the investigation are limestone, basalt and steel-slag. Steel-slag is a byproduct material of Eregli Iron and Steel Works, which is suitable to meet the durability test requirements as well as the electrical resistivity and the waste contaminants regulatory level. Conventional triaxial testing at a strain rate of 0.4 mm/min is used to obtain these characteristics for the scaled-down materials with a diameter of 100 mm specimen under a confining stress of 35 kPa, 70 kPa and 105 kPa / whereas that of only 35 kPa is used to characterize the accumulated plastic strain. The angle of internal friction, f, and the apparent cohesion, c, may be conservatively taken to be 42o and 35 kPa for all materials. The elastic moduli values for all materials may be predicted within an adequate estimate for the engineering purposes by using the power law parameters, K and n, determined for L-9.5 (D50 = 12.7 mm), the coarsest gradation tested for limestone. K with a reference pressure, pr = 1 kPa and n values for L-9.5, respectively, are 4365 and 0.636 for initial / 8511 and 0.419 for secant / 25704 and 0.430 for unloading-reloading elastic moduli. The unloading-reloading moduli increased, as the number of cycles increased. An increase in unloading-reloading modulus at N = 20 obtained was roughly 15% for scaled-down limestone / 10% for the basalt / and 5% for the steel-slag. The plastic strain after first cycle, &amp / #949 / 1, and the plastic strain coefficient, C can be represented as a function of mean particle size for each material type. For the limestone, basalt and steel-slag prototype size, D50 = 45 mm, &amp / #949 / 1 values of 0.59, 0.43 and 0.75 and C values of 0.54, 1.42 and 0.74 are predicted, respectively.

Les développements récents en électronique de puissance visent à augmenter la densité de puissance totale dans les systèmes de conversion d'énergie. Cela contraint alors de plus en plus les matériaux isolants, tels que l'encapsulation dans les modules de puissance. Si les renforcements de champ électrique au sein des polymères isolants atteignent des valeurs critiques, cela peut entraîner une activité de décharges partielles, des arborescences voire la rupture totale de l'isolation. L'objectif de cette thèse est d'étudier l'adaptation des propriétés diélectriques d'un polymère composite isolant afin de réduire les contraintes autour des zones de renforcements de champ électrique. Nous proposons une nouvelle approche de gradation de potentiel pour minimiser les renforcements de champ à travers une structuration locale du matériau composite sous forme d'un gradient de permittivité auto-adaptatif localisé là où les contraintes sont les plus intenses. Cette structuration est réalisée via l'application d'un champ électrique DC lors du procédé d'élaboration du matériau composite, permettant le déplacement par électrophorèse des particules. Le composite à gradient de permittivité est composé d'une matrice époxy chargée en particules à forte permittivité (titanate de strontium SrTiO3 ou titanate de baryum BaTiO3). L'action d'un champ électrique DC sur la résine liquide chargée en particules engendre leur accumulation vers l'électrode de plus fort potentiel, formant ainsi une couche fortement chargée, qui confère à cette région une permittivité plus élevée. Chaque région du composite structuré (zone de la couche accumulée et zone faiblement chargée en particules) a été caractérisée en termes de propriétés diélectriques (permittivité et pertes). Alors que la région des composites faiblement chargée en particules conserve une permittivité voisine de celle des composites homogènes, la couche accumulée présente une augmentation importante liée à l'augmentation de la densité de particules. Les concentrations en particules de chaque région du matériau structuré ont été déterminées précisément, et les valeurs de permittivités associées se corrèlent bien avec les valeurs de permittivité des matériaux composites homogènes de taux de chargement équivalent. Cela montre que la couche accumulée ne s'est pas organisée d'une façon particulière. Concernant la rigidité diélectrique de la couche accumulée, elle présente des valeurs suffisantes pour tenir les contraintes rencontrées et ses valeurs suivent la loi de puissance classique en fonction de l'épaisseur. Des simulations par éléments finis confirment l'intérêt de ces matériaux pour la minimisation des renforcements de champ électrique au niveau du point triple dans les modules de puissance. Ces résultats montrent tout le potentiel applicatif de ces nouveaux matériaux à gradient de champ. Ils pourraient permettre l'amélioration de la fiabilité et de la robustesse des modules de puissance et autres systèmes électriques travaillant sous fort champ. / New developments in power electronics allow increasing the power density of the conversion systems. This means that the insulating materials, such as the encapsulation in power modules, are more are more stressed. If the electric field reinforcements in insulating polymers reach critical values, this can lead to a partial discharge activity, electrical treeing and eventually a complete breakdown of the insulation. The objective of this thesis is to study the appropriate matching of the dielectric properties of insulating polymer composites in order to reduce the electrical stress in the regions of field reinforcement. A new approach to minimize the reinforcements is proposed through a local structuration of the composite material allowing an auto-adaptive permittivity gradient where the largest stresses are present. This structuration is achieved thanks to the application of a DC electric field during the elaboration process of the composite material, leading to the displacement of the particles by electrophoresis. The field grading material is an epoxy matrix filled with high permittivity particles (strontium titanate SrTiO3 or barium titanate BaTiO3). Applying a DC electric field on the liquid resin containing the particles induces their accumulation on the high voltage electrode, building an accumulated layer highly concentrated in particles, conferring to this region a higher permittivity. Each region of the structured composite (accumulated layer and low concentrated region) was characterized in terms of dielectric properties (permittivity and losses). While the low concentrated region of particles keeps a permittivity close to that of homogeneous composites one, the accumulated layer exhibits a significant increase due to the increase in the local particle content. The particle concentration in each region of the structured material were precisely determined, and the related permittivity values are in good agreement with the permittivity values of the homogeneous composite materials of the same filler content. This shows that the accumulated layer was not organized in a particular way. Regarding the dielectric strength of the accumulated layer, its values are large enough for the applications and these values follow the typical power law versus thickness. Finite element methods prove that these materials are appropriate for minimizing the electric field reinforcements at the triple point, between the metal, the ceramic and the encapsulation. These results highlight the interests of these new kind of field grading materials. They could allow improving the reliability and the robustness of power modules or other electrical systems working at high field.

Recently, there has been growing interest on the behaviour of unbound granular material in road base layers. Researchers have studied that the design of a new pavement and prediction of service life need proper characterization of unbound granular materials, which is one of the requirements for a new mechanistic design method in flexible pavement. Adequate knowledge of the strength and deformation characteristics of unbound layer in pavements is a prerequisite for proper thickness design, residual life determination, and overall economic optimization of the pavement structure. The current knowledge concerning the granular materials employed in pavement structures is limited. In addition, to date, no general framework has been established to explain satisfactorily the behaviour of unbound granular materials under the complex repeated loading which they experience. In this study, a conceptual method, packing theory-based model is introduced; this framework evaluates the stability and performance of granular materials based on their packing arrangement. In the framework two basic aggregate structures named as Primary Structure (PS), and Secondary Structure (SS). The Primary Structure (PS) is a range of interactive grain sizes that forms the network of unbound granular materials. The Secondary Structure (SS) includes granular materials smaller than the primary structure. The Secondary Structures fill the gaps between the particles in the Primary Structure and larger particles essentially float in the skeleton. In this particular packing theory-based model; the Primary Structure porosity, the average contact points (coordination number) of Primary Structure, and a new parameter named Disruption Potential are the key parameters that determine whether or not a particular gradation results in a suitable aggregate structure. Parameters mentioned above play major role in the aggregate skeleton to perform well in terms of resistance to permanent deformation as well as load carrying capacity (resilient modulus). The skeleton of the materials must be composed of both coarse enough and a limited amount of fine granular materials to effectively resist deformation and carry traffic loads. / QC 20120601

This thesis produces a definition of consonant mutations, a hitherto relatively unexplored phenomenon in typology, using a sample of languages from the Celtic and Uralic languages. It is defined using Canonical Typology. The base of the phenomenon is established as ‘functionalized consonant alternations’, with seven dimensions of variation: conditioning elements>no conditioning elements; sole functional indicator>accompanied by other morphemes; more than two grades>two grades; some effect on surrounding vowels>only affecting the consonant; only leniting>also non-leniting sound changes; word-initial/-final>word-medial placement; and less regular>more regular. It is also argued that mutations’ phonology is less important than their function.

A presente dissertação tem por objetivo avaliar o método Bailey de seleção granulométrica de agregados para misturas asfálticas, desenvolvido no Departamento de Transportes de Illinois (IDOT) e que vem sendo usado desde o início da década de 80. Atualmente, pesquisas têm sido desenvolvidas com o intuito de aperfeiçoar a seleção granulométrica e, conseqüentemente, o desempenho de misturas asfálticas, incluindo estudos a respeito do método Bailey. Trata-se de um método de seleção granulométrica por volume que, através de um modo sistemático de ajuste da graduação dos agregados na preparação de uma mistura asfáltica, proporciona um forte esqueleto de agregado para resistir à deformação permanente. Resulta, também, em um adequado volume de vazios no agregado mineral, o que permite um maior teor de ligante e aumento da durabilidade da mistura. Os resultados obtidos neste trabalho mostram que as misturas Bailey, independentemente do tipo de agregado (basalto ou gabro), apresentam melhores resultados do que as misturas convencionais e termos de relação módulo de resiliência –resistência à tração. Os resultados do ensaio de fluência por compressão uniaxial estática indicam um melhor desempenho da mistura Bailey com basalto, embora a mistura convencional com gabro tenha apresentado um comportamento ligeiramente superior ao da mistura Bailey com gabro. / The main goal of the master thesis is the evaluation of the Bailey method of gradation selection of aggregates for hot mix asphalt (HMA). The method was developed at the Illinois Department of Transportation (IDOT) and it has been used since the early 1980s. Many researches are intending to improve the gradation selection and, consequently, the performance of HMA, including studies about the Bailey method. It is a method that uses a systematic way of selection and adjustment of the aggregate gradation to provide a strong aggregate skeleton. It also provides an adequate amount of voids in the mineral aggregate that result in higher binder content and improved durability. The results obtained in this work show that Bailey asphalt mixtures, for both aggregates considered, are better than conventional mixtures in terms of resilient modulus – tensile strength ratio. The results of static creep tests indicate that the Bailey mixture with basalt aggregates presents the best performance among the evaluated asphalt mixtures.

O objetivo principal desta pesquisa é avaliar a influência que as propriedades estudadas dos agregados exercem sobre propriedades volumétricas e mecânicas de misturas asfálticas densas. Para tanto, foram avaliadas as propriedades de consenso e de origem, especificadas pelo Superpave, de um conjunto de agregados, além de suas densidades, porosidade, absorção e adesividade. Foram estudados agregados de gabro, basalto e areia natural e três tipos de granulometrias, uma denominada AZR, passando acima da zona de restrição da especificação Superpave, e outras duas, obtidas através do sistema de seleção granulométrica Bailey. Também três níveis de energia de compactação foram aplicados às misturas, 75, 110 e 155 golpes por face do corpo-de-prova Marshall. Avaliou-se o comportamento mecânico das misturas através dos ensaios de estabilidade e fluência Marshall, fluência por compressão uniaxial uniforme, fluência por compressão uniaxial dinâmica, resistência à tração, módulo de resiliência e fadiga. Os resultados mostraram que, de uma maneira geral, o agregado de gabro apresentou superioridade em relação ao agregado de basalto e de areia natural, tanto quando analisado isoladamente como quando analisado nas misturas asfálticas. Suas características de forma, angularidade e textura superficial permitiram arranjos entre partículas adequados, formando esqueletos estruturais resistentes à deformação permanente e também à fadiga. As análises das misturas à luz da granulometria mostram que, de uma maneira geral, a granulometria AZR produziu misturas mais estáveis, mais resistentes à deformação permanente e à fadiga. Pôde-se constatar, também, que as propriedades volumétricas são sensíveis às densidades dos agregados e à taxa de absorção destes, além de serem influenciadas diretamente pelas características de superfície dos agregados e pela energia de compactação. Com o aumento da energia de compactação aplicada, as partículas angulosas e rugosas dos agregados de gabro e de basalto arranjaram-se de maneira mais próxima e, por conseqüência, houve a diminuição dos vazios do agregado mineral e elevação da estabilidade e rigidez das misturas, sem, contudo, causar prejuízos à vida de fadiga. Os estudos sobre a absorção de asfalto pelos agregados revelaram que os agregados absorvem mais asfalto quanto mais fina a espessura da película de asfalto que os envolve e, também, que misturas com um mesmo teor de asfalto absorvem quantidades semelhantes de asfalto, sendo o tempo necessário para que a absorção se complete diretamente proporcional à viscosidade (temperatura) do asfalto. / The main objective of this research is to evaluate the influence that the studied properties of aggregates have on volumetric and mechanical characteristics of dense asphalt mixtures. It was evaluated origin and consensus properties, specified by the Superpave, for a set of aggregates, besides their densities, porosity, absorption and adhesiveness. Aggregates of gabbro, basalt and natural sand were studied and three types of aggregate gradations, one called AZR, passing above the zone of restriction of the Superpave specification, and two others, obtained through the Bailey method. Three levels of compaction energy were applied, corresponding respectively to 75, 110 and 155 blows of the Marshall hammer per face of the specimen. The mechanical behavior of the hot mix asphalt (HMA) was evaluated through the Marshall stability and flow, static and dynamic creep, indirect tensile strength, resilient modulus and fatigue tests. The results showed that, in general terms, the gabbro aggregate presented a superior behavior compared to the natural sand aggregate and the basalt aggregate, based on both aggregate and asphalt mixture evaluation tests. Its characteristics of form, angularity and surface texture resulted in an adequate arrangement between particles, building a resistant structural skeleton to both permanent deformation and fatigue cracking. Analyses of the HMA mixtures as a function of gradation showed that, in general terms, AZR mixtures were more stable, more resistant to permanent deformation and to fatigue cracking than Bailey mixtures. It could be evidenced that the volumetric properties depends on the specific gravity and the absorption rate of the aggregates, being also directly influenced by aggregate surface characteristics and compaction energy. Increasing the energy applied for specimen compaction resulted, for the angular and rough particles of gabbro and basalt aggregates, in a closer arrangement, with reduction of the voids in mineral aggregate and increase of the stability and stiffness of the mixtures, without, however, causing damages that could conduct to a shorter fatigue life. The studies about absorption of asphalt by aggregates showed that the smaller the asphalt film thickness the greater the asphalt absorption. The results also showed that HMA with the same asphalt content absorb similar amounts of asphalt, although the necessary time to complete the absorption is directly proportional to the asphalt viscosity (temperature).

O objetivo principal desta pesquisa é avaliar a influência que as propriedades estudadas dos agregados exercem sobre propriedades volumétricas e mecânicas de misturas asfálticas densas. Para tanto, foram avaliadas as propriedades de consenso e de origem, especificadas pelo Superpave, de um conjunto de agregados, além de suas densidades, porosidade, absorção e adesividade. Foram estudados agregados de gabro, basalto e areia natural e três tipos de granulometrias, uma denominada AZR, passando acima da zona de restrição da especificação Superpave, e outras duas, obtidas através do sistema de seleção granulométrica Bailey. Também três níveis de energia de compactação foram aplicados às misturas, 75, 110 e 155 golpes por face do corpo-de-prova Marshall. Avaliou-se o comportamento mecânico das misturas através dos ensaios de estabilidade e fluência Marshall, fluência por compressão uniaxial uniforme, fluência por compressão uniaxial dinâmica, resistência à tração, módulo de resiliência e fadiga. Os resultados mostraram que, de uma maneira geral, o agregado de gabro apresentou superioridade em relação ao agregado de basalto e de areia natural, tanto quando analisado isoladamente como quando analisado nas misturas asfálticas. Suas características de forma, angularidade e textura superficial permitiram arranjos entre partículas adequados, formando esqueletos estruturais resistentes à deformação permanente e também à fadiga. As análises das misturas à luz da granulometria mostram que, de uma maneira geral, a granulometria AZR produziu misturas mais estáveis, mais resistentes à deformação permanente e à fadiga. Pôde-se constatar, também, que as propriedades volumétricas são sensíveis às densidades dos agregados e à taxa de absorção destes, além de serem influenciadas diretamente pelas características de superfície dos agregados e pela energia de compactação. Com o aumento da energia de compactação aplicada, as partículas angulosas e rugosas dos agregados de gabro e de basalto arranjaram-se de maneira mais próxima e, por conseqüência, houve a diminuição dos vazios do agregado mineral e elevação da estabilidade e rigidez das misturas, sem, contudo, causar prejuízos à vida de fadiga. Os estudos sobre a absorção de asfalto pelos agregados revelaram que os agregados absorvem mais asfalto quanto mais fina a espessura da película de asfalto que os envolve e, também, que misturas com um mesmo teor de asfalto absorvem quantidades semelhantes de asfalto, sendo o tempo necessário para que a absorção se complete diretamente proporcional à viscosidade (temperatura) do asfalto. / The main objective of this research is to evaluate the influence that the studied properties of aggregates have on volumetric and mechanical characteristics of dense asphalt mixtures. It was evaluated origin and consensus properties, specified by the Superpave, for a set of aggregates, besides their densities, porosity, absorption and adhesiveness. Aggregates of gabbro, basalt and natural sand were studied and three types of aggregate gradations, one called AZR, passing above the zone of restriction of the Superpave specification, and two others, obtained through the Bailey method. Three levels of compaction energy were applied, corresponding respectively to 75, 110 and 155 blows of the Marshall hammer per face of the specimen. The mechanical behavior of the hot mix asphalt (HMA) was evaluated through the Marshall stability and flow, static and dynamic creep, indirect tensile strength, resilient modulus and fatigue tests. The results showed that, in general terms, the gabbro aggregate presented a superior behavior compared to the natural sand aggregate and the basalt aggregate, based on both aggregate and asphalt mixture evaluation tests. Its characteristics of form, angularity and surface texture resulted in an adequate arrangement between particles, building a resistant structural skeleton to both permanent deformation and fatigue cracking. Analyses of the HMA mixtures as a function of gradation showed that, in general terms, AZR mixtures were more stable, more resistant to permanent deformation and to fatigue cracking than Bailey mixtures. It could be evidenced that the volumetric properties depends on the specific gravity and the absorption rate of the aggregates, being also directly influenced by aggregate surface characteristics and compaction energy. Increasing the energy applied for specimen compaction resulted, for the angular and rough particles of gabbro and basalt aggregates, in a closer arrangement, with reduction of the voids in mineral aggregate and increase of the stability and stiffness of the mixtures, without, however, causing damages that could conduct to a shorter fatigue life. The studies about absorption of asphalt by aggregates showed that the smaller the asphalt film thickness the greater the asphalt absorption. The results also showed that HMA with the same asphalt content absorb similar amounts of asphalt, although the necessary time to complete the absorption is directly proportional to the asphalt viscosity (temperature).

A presente dissertação tem por objetivo avaliar o método Bailey de seleção granulométrica de agregados para misturas asfálticas, desenvolvido no Departamento de Transportes de Illinois (IDOT) e que vem sendo usado desde o início da década de 80. Atualmente, pesquisas têm sido desenvolvidas com o intuito de aperfeiçoar a seleção granulométrica e, conseqüentemente, o desempenho de misturas asfálticas, incluindo estudos a respeito do método Bailey. Trata-se de um método de seleção granulométrica por volume que, através de um modo sistemático de ajuste da graduação dos agregados na preparação de uma mistura asfáltica, proporciona um forte esqueleto de agregado para resistir à deformação permanente. Resulta, também, em um adequado volume de vazios no agregado mineral, o que permite um maior teor de ligante e aumento da durabilidade da mistura. Os resultados obtidos neste trabalho mostram que as misturas Bailey, independentemente do tipo de agregado (basalto ou gabro), apresentam melhores resultados do que as misturas convencionais e termos de relação módulo de resiliência –resistência à tração. Os resultados do ensaio de fluência por compressão uniaxial estática indicam um melhor desempenho da mistura Bailey com basalto, embora a mistura convencional com gabro tenha apresentado um comportamento ligeiramente superior ao da mistura Bailey com gabro. / The main goal of the master thesis is the evaluation of the Bailey method of gradation selection of aggregates for hot mix asphalt (HMA). The method was developed at the Illinois Department of Transportation (IDOT) and it has been used since the early 1980s. Many researches are intending to improve the gradation selection and, consequently, the performance of HMA, including studies about the Bailey method. It is a method that uses a systematic way of selection and adjustment of the aggregate gradation to provide a strong aggregate skeleton. It also provides an adequate amount of voids in the mineral aggregate that result in higher binder content and improved durability. The results obtained in this work show that Bailey asphalt mixtures, for both aggregates considered, are better than conventional mixtures in terms of resilient modulus – tensile strength ratio. The results of static creep tests indicate that the Bailey mixture with basalt aggregates presents the best performance among the evaluated asphalt mixtures.