This thesis presents how to establish a theoretical model to predict risk of thermal cracking in young concrete when cast on ground or an arbitrary construction. The crack risk in young concrete is determined in two steps: 1) calculation of temperature distribution within newly cast concrete and adjacent structure; 2) calculation of stresses caused by thermal and moisture (due to self-desiccation, if drying shrinkage not included) changes in the analyzed structure. If the stress reaches the tensile strength of the young concrete, one or several cracks will occur. The main focus of this work is how to establish a theoretical model denoted Equivalent Restraint Method model, ERM, and the correlation between ERM models and empirical experiences. A key factor in these kind of calculations is how to model the restraint from any adjacent construction part or adjoining restraining block of any type. The building of a road tunnel and a railway tunnel has been studied to collect temperature measurements and crack patterns from the first object, and temperature and thermal dilation measurements from the second object, respectively. These measurements and observed cracks were compared to the theoretical calculations to determine the level of agreement between empirical and theoretical results. Furthermore, this work describes how to obtain a set of fully tested material parameters at CompLAB (test laboratory at Luleå University of Technology, LTU) suitable to be incorporated into the calculation software used. It is of great importance that the obtained material parameters describe the thermal and mechanical properties of the young concrete accurately, in order to perform reliable crack risk calculations.  Therefore, analysis was performed that show how a variation in the evaluated laboratory tests will affect the obtained parameters and what effects it has on calculated thermal stresses.

Submitted by Luciana Ferreira (lucgeral@gmail.com) on 2017-12-13T11:59:28Z No. of bitstreams: 2 Dissertação - Patrícia Guedes Gambale - 2017.pdf: 11002358 bytes, checksum: 0a8a575fbc0c16340994402f2059944c (MD5) license_rdf: 0 bytes, checksum: d41d8cd98f00b204e9800998ecf8427e (MD5) / Approved for entry into archive by Luciana Ferreira (lucgeral@gmail.com) on 2017-12-13T12:00:08Z (GMT) No. of bitstreams: 2 Dissertação - Patrícia Guedes Gambale - 2017.pdf: 11002358 bytes, checksum: 0a8a575fbc0c16340994402f2059944c (MD5) license_rdf: 0 bytes, checksum: d41d8cd98f00b204e9800998ecf8427e (MD5) / Made available in DSpace on 2017-12-13T12:00:08Z (GMT). No. of bitstreams: 2 Dissertação - Patrícia Guedes Gambale - 2017.pdf: 11002358 bytes, checksum: 0a8a575fbc0c16340994402f2059944c (MD5) license_rdf: 0 bytes, checksum: d41d8cd98f00b204e9800998ecf8427e (MD5) Previous issue date: 2017-08-31 / Fundação de Amparo à Pesquisa do Estado de Goiás - FAPEG / The advancement of concrete technologies and methods of structural calculation nowadays makes buildings increasingly challenging, especially from the point of view of foundations. Foundation blocks with great volumes need attention as to the fissures arising from the exothermic process of hydration of the concrete, this concern defines the mixture as mass concrete, a widespread term in the construction of dams and that has been gaining space in urban civil construction. This study proposes the monitoring of prototypes of concrete blocks developed in the laboratory and foundation block in the field, with the use of thermocouples comparing with numerical methods of finite elements aiming to improve the prediction of cracks and to develop techniques so that they are avoided. This study will analyze the influence of the type and consumption of cement in the emergence of tensions arising from the energy released during its hydration. As results, a relation of the type interference and cement consumption is presented through the monitoring and analysis of the foundation block prototypes developed in the research, the development of a simplified unidirectional model of temperature and voltage prediction due to the heat of hydration for to evaluate the maximum temperature reached and the potential of cracking in the concrete mass and the comparison between the temperature results obtained in the Ansys program, which uses three- dimensional modeling and, as a way of validating the predictive model of thermal behavior as a reliable tool of analysis, the study also presents a field monitoring of a foundation block of a construction located in Goiânia and later application of the forecast model and the Ansys program. It was found, therefore, that the cement type has a considerable influence on the compressive strength and the adiabatic elevation, the latter being less significant. As for the cement consumption analysis, there was a notable increase in temperature in the concrete with higher consumption, causing cracks in the analyzed structure. By means of the results presented by the Ansys program, the monitoring of the prototypes and block in the field and the proposed forecast model, the validation of this model was confirmed as a good predictive tool of thermal behavior, highlighting some limiting conditions that surround it. / O avanço das tecnologias do concreto e dos métodos de cálculo estrutural possibilita, nos dias atuais, edifícios cada vez mais desafiadores, principalmente do ponto de vista das fundações. Blocos de fundações de grandes volumes, definidos como concreto massa, carecem de atenção quanto às fissuras advindas do processo exotérmico de hidratação do concreto, estapreocupação atualmente é bastante difundida na construção de barragens e que vem ganhando espaço na construção civil urbana. Este trabalho propõe o monitoramento de protótipos de blocos de concreto desenvolvidos em laboratório e bloco de fundação em campo, com o uso de termopares comparando com métodos numéricos de elementos finitos objetivando aprimorar a previsão de fissuras e desenvolver técnicas para que estas sejam evitadas. O trabalho analisará a influência do tipo e consumo de cimento na liberação de calor e no surgimento de tensões advindas da energia liberada durante sua hidratação. Como resultados, são apresentados uma relação da interferência dos tipos e consumo de cimento por meio do monitoramento e análise dos protótipos de blocos de fundação desenvolvidos na pesquisa, o desenvolvimento de um modelo simplificado unidirecional de previsão de temperatura e tensão devido ao calor de hidratação para avaliar a temperatura máxima atingida e o potencial de fissuração no concreto massa e a comparação entre os resultados de temperatura obtidos no programa Ansys, que utiliza modelagem tridimensional e, como forma de validar o modelo preditivo do comportamento térmico como ferramenta confiável de análise, o trabalho também apresenta um monitoramento em campo de um bloco de fundação de uma obra localizada Goiânia e posterior aplicação do modelo de previsão e do programa Ansys. Verificou-se, assim, que o tipo de cimento influencia de maneira considerável na resistência à compressão e na elevação adiabática, sendo a última menos significativa. Quanto a análise de consumo de cimento, verificou-se um aumento notável de temperatura no concreto com maior consumo, ocasionando fissuras na estrutura analisada. Por meio dos resultados apresentados pelo programa Ansys, o monitoramento dos protótipos e bloco em campo e o modelo de previsão proposto, confirmou-se a validação do referido modelo como boa ferramenta pretidiva de comportamento térmico, ressaltando algumas condições limitantes que o cercam.

The impact of temperatures (up to 1000 °C) with various heating rates of 5 °C/min, 200 °C/min, 300 °C/min, and according to ISO 834 standard fire curve on physical, mechanical, and thermal properties, as well as thermo-mechanical behaviors of granites were investigated. A new methodology was proposed for the heterogeneity characterization of rocks at the grain-size level in numerical simulation. The thermo-mechanical constitutive law is developed by combining the temperature-dependent relations of granite properties with classical Mohr-Coulomb model with strain-softening and tension cut-off. The proposed modelling strategy is able to replicate the thermal induced cracking which results in reduced peak strength, pronounced softening and transition from brittle to ductile behaviour. Research results help to understand the damage mechanisms of granite caused by fire or other high temperature conditions, and can be used to develop guidelines for repair and maintenance as well as assessment of risks of tunnels and historical buildings after fire accidents.

Low temperature cracking is an important form of asphalt pavement deterioration in cold regions. The cracks develop when thermally induced stresses exceed the fracture resistance of the asphalt pavement. In this study, by incorporating HMA fracture mechanics into thermal cracking model, a new integrated model is introduced to investigate low temperature cracking performance. To evaluate its reliability and accuracy, the predicted thermally induced stress and failure temperature are compared with the fracture stress and fracture temperature obtained from thermal stress restrained specimen test. The findings indicate that this HMA fracture mechanics-based thermal cracking model has a great potential to reliably evaluate the performance of asphalt mixtures subjected to thermally induced damage.

Creep is defined as deformation that takes place under constant load after an initial elastic response. This thesis focuses on a material property problem area that concerns stress analysis. Focus is on stress development considering creep deformations occurring when a concrete structure is under load, i.e. stress analysis with viscoelastic properties of the material.From laboratory tests, both elastic modulus and deformations over time are estimated in an evaluation process. Usually, deformations of moist sealed samples are denoted basic creep. At Luleå Technical University creep measurements are evaluated according to the theory and methodology in Larson and Jonasson (2003a, 2003b). The model is denoted Linear Logarithmic Model, used for moist sealed concrete samples. This thesis involves an investigation of the evaluation procedure for basic creep performed in Thysell laboratory at LTU, to examine how sensitive the evaluation process is for the outcome from stress calculations. The calculations are performed in the Finite Element Method software ConTeSt Pro.The aim of the thesis is to analyze the sensitivity of evaluation of basic creep and of the Linear Logarithmic Model (LLM) by making changes in the evaluation process to see how different parameters sets effect calculated stresses/strains during through crack analysis. The changes are solely done in the relaxation spectra.The purpose is also to analyze how sensitive the changes made in the evaluation process are when typical cases are studied. The typical cases are defined with a structure of a newly cast wall on a mature slab, where various thickness of the wall during different temperature conditions are analyzed. The temperature conditions are named standard, winter and summer. With this, concrete is tested and evaluated to yield two material parameter sets useful for temperature - and stress calculations for young concrete.The material parameter sets were analyzed and their creep values were converted into relaxation values, i.e. relaxation spectra, according to Maxwell-chain formulation for LLM. ConTeSt calculations generate temperature development for the walls and slabs. Colour maps and values of the strain ratio for each studied case are also obtained.It can be established that the evaluation process of basic creep is sensitive. A conclusion to be drawn is that small changes in the relaxation spectra, gives changes in the results of stress calculations for the typical cases. As soon as we deviate from the temperature development for the test performed in the laboratory, either by changing the thickness of the wall or by testing different temperature conditions we get a different temperature development than the tested one. With the deviation in the calculated temperature development compared to the measured one, a difference in the calculated strain ratios for the two different material parameter sets created are found.The main discovery in this work is that when a geometry of the wall that is identical to the geometry of the concrete tested at the laboratory is analyzed, a small deviation in the calculations of strain is obtained. This is expected since the temperature development in the created wall will follow the temperature development of the tested concrete. When differing from this geometry and temperature case, differences in calculated strain ratios are observed. / Krypning är deformation som sker under en konstant belastning och i detta examensarbete är det fokus på deformationer av fuktförseglade betongprover. Detta examensarbete är inriktat på olika materialparametersuppsättningar som berör spänningsanalyser. Det är fokus på spänningsutveckling med avseende på krypdeformationer som uppstår när en betongstruktur är under belastning. Detta gällande spänningsanalyser med viskoelastiska egenskaper hos betongmaterialet. Från laboratorietester bestäms både elasticitetsmodulen och deformationer över tid i en utvärderingsprocess. På Luleå tekniska universitet, utvärderas krypningsmätningarna enligt teorin och metodiken som finns beskriven i Larson och Jonasson (2003a, 2003b). Modellen är benämnd Linjär Logaritmisk Modell (LLM), som används för fuktförseglade betongprover. Examensarbetet innehåller en undersökning av utvärderingsprocessen för krypning utförda i Thysell laboratoriet vid LTU. Detta för att undersöka hur känslig utvärderingsprocessen är för resultatet av spänningsberäkningar. Beräkningarna utförs i Finita Elementprogrammet ConTeSt. Syftet med detta arbete är att analysera känsligheten i utvärderingen av krypning för fuktförseglade betongprover och för den Linjära Logaritmiska modellen genom att göra ändringar i utvärderingsprocessen för att se hur olika materialparametersuppsättningar påverkar beräknade spänningar under analys av genomgående sprickor. Ändringar görs endast i relaxationsspektra. Syftet är också att analysera hur känsliga förändringarna i utvärderingsprocessen är när olika typfall studeras. Typfallen definieras av ny gjuten vägg på en mogen betongplatta, där olika väggtjocklekar under olika temperaturförhållanden analyseras. Temperaturförhållandena benämns standard, vinter och sommar. Därvid testas och utvärderas betongen för att ge två materialparameteruppsättningar som är användbara för temperatur- och spänningsberäkningar för ung betong.Materialparameteruppsättningarna analyserades och deras krypvärden konverterades till relaxationsvärden, så kallade relaxations spektra, genom att använda Maxwell element för LLM. Från ConTeSt beräkningar erhålls värden för temperaturutveckling i vägg samt platta. Värmeutvecklingskarta tillsammans med värden på töjningskvoten för väggarna under varje studerat temperaturfall erhålls också från ConTeSt programmet. Det kan fastställas att den studerade utvärderingsprocessen för krypning är känslig. Små ändringar i relaxationsspektra ger variationer i resultatet av spänningsberäkningar för de olika typfallen. Så fort vi varierar den beräknade väggens temperaturutveckling från temperaturutvecklingen för testet som utförts i laboratoriet, antingen genom att ändra väggtjocklek eller genom att testa olika temperaturförhållanden, så erhålls en annorlunda temperaturutveckling än den som togs fram från laboratoriet. Med avvikelser i de beräknade temperaturutvecklingarna jämfört med den erhållna temperaturutvecklingen från den testade betongen i laboratoriet beräknas och analyseras skillnaden i töjningskvot. Den huvudsakliga upptäckten i detta arbete är att när den beräknade geometrin på väggen är identisk med den geometri som används för testriggen i laboratoriet, erhålls små variationer i de beräknade töjningskvoten. Detta är förväntat eftersom temperaturutvecklingen i den beräknade väggen är densamma som för betongen i testriggen i laboratoriet. När man avviker från den geometri eller de temperaturförhållandena som är identiska till dem i laboratoriet så erhålls större avvikelser i värden för den beräknade töjningskvoten.

No description available.

Les procédés conventionnels de transformation thermique de la biomasse sont conçus pour la production d’huiles ou de gaz riches en CO, CO2, H2 et hydrocarbures légers à des fins énergétiques ou chimiques. Le pilote de pyrolyse rapide utilisé dans cette étude comporte un réacteur cyclone, chauffé à ses parois, et capable de mettre en oeuvre la pyroliquéfaction ou la pyrogazéification par le simple jeu des conditions opératoires. Les produits de réaction (charbon, huiles et gaz) sont récupérés et analysés. Les bilans de matière massiques et élémentaires (C, H, O) bouclent de façon très satisfaisante. Les basses températures de paroi et faibles débits de gaz vecteur favorisent la pyroliquéfaction. La production d’huiles augmente avec le débit de biomasse. La taille des particules a une faible influence sur les sélectivités en gaz, liquides et charbon. Un modèle de fonctionnement du cyclone est établi en tenant compte de l’hydrodynamique des phases gaz et solide ainsi que des lois de transferts de chaleur paroi-gaz et paroi-solides dans le cyclone. Ce modèle inclut également un schéma cinétique de pyrolyse rapide intégré dans un modèle de décomposition de la particule, ainsi qu’un modèle de craquage des vapeurs. Validé successivement sur la cellulose puis sur le bois, il permet de prédire les variations des sélectivités en fonction des conditions opératoires. Le modèle montre que les réactions de craquage se déroulent majoritairement dans une mince couche limite proche des parois chaudes. On propose deux lois générales (pyrogazéification et pyroliquéfaction) regroupant les différents paramètres opératoires contrôlant les performances du réacteur / The usual processes of biomass thermal upgrading are designed for the production of bio-oils or of gases rich in CO, CO2, H2 and light hydrocarbons for energy or chemical productions. The laboratory-scaled set-up used in this study includes a cyclone reactor, heated at its walls and able to carry out the fast pyroliquefaction or pyrogazeification by simply changing the operating conditions. The reaction products (charcoal, liquids and gases) are recovered and analyzed. The masses and elementary (C, H, O) balances closures are very accurate. Pyroliquefaction conditions are favoured by low walls temperatures and small carrier gas flowrates. The bio-oils fractions increase with the biomass flowrate. The particles size has only a weak influence on gas, liquids and charcoal selectivities. A model representing the cyclone behaviour is established by taking into account the hydrodynamics of the gases and solids, and the wall-gas and wall-solids heat transfer laws inside the cyclone. This general model includes also a model of particle decomposition (scheme of fast pyrolysis in competition with heat transfers) and a model of vapours cracking. Validated successively with cellulose and then with wood, it allows to predict the variations of the selectivities according to the operating conditions. The model shows that the cracking reactions occur mainly inside a thin boundary layer close to the hot walls. Two laws (pyrogazeification and pyroliquefaction) gathering the various operational parameters that control the performances of the reactor are finally proposed

Le procédé de craquage thermique est un procédé industriel sensible aux conditions de température et de pression. L’utilisation de réacteurs aux parois nervurées est une méthode permettant d’améliorer la sélectivité chimique du procédé en augmentant considérablement les transferts de chaleur. Cependant, cette méthode induit une augmentation des pertes de charge dans le réacteur, ce qui est dommageable pour le rendement chimique et doit être quantifié. En raison de la complexité de l’écoulement turbulent et de la cinétique chimique, le gain réel offert par ces géométries en termes de sélectivité chimique est toutefois mal connu et difficile à estimer, d’autant plus que des mesures expérimentales détaillées sont très rares et difficiles à mener. L’objectif de ce travail est double: d’une part évaluer le gain réel des parois nervurées sur le rendement chimique; d’autre part proposer de nouveaux designs de réacteurs offrant une sélectivité chimique optimale. Ceci est rendu possible par l’approche de simulation numérique aux grandes échelles (LES), qui est utilisée pour étudier l’écoulement réactif à l’intérieur de diverses géométries de réacteurs. Le code AVBP, qui résout les équations de Navier Stokes compressibles pour les écoulements turbulents, est utilisé pour simuler le procédé grâce à une méthodologie numérique adaptée. En particulier, les effets des pertes de charge et du transfert thermique sur la conversion chimique sont comparés pour un réacteur lisse et un réacteur nervuré afin de quantifier l’impact de la rugosité de paroi dans des conditions d’utilisation industrielles. Une méthodologie d’optimisation du design des réacteurs, basée sur plusieurs simulations numériques et les processus Gaussiens, est finalement mise au point et utilisée pour aboutir à un design de réacteur de craquage thermique innovant, maximisant le rendement chimique / Thermal cracking is an industrial process sensitive to both temperature and pressure operating conditions. The use of internally ribbed reactors is a passive method to enhance the chemical selectivity of the process, thanks to a significant increase of heat transfer. However, this method also induces an increase in pressure loss, which is damageable to the chemical yield and must be quantified. Because of the complexity of turbulence and chemical kinetics, and as detailed experimental measurements are difficult to conduct, the real advantage of such geometries in terms of selectivity is however poorly known and difficult to assess. This work aims both at evaluating the real benefits of internally ribbed reactors in terms of chemical yields and at proposing innovative and optimized reactor designs. This is made possible using the Large Eddy Simulation (LES) approach, which allows to study in detail the reactive flow inside several reactor geometries. The AVBP code, which solves the Navier-Stokes compressible equations for turbulent flows, is used in order to simulate thermal cracking thanks to a dedicated numerical methodology. In particular, the effect of pressure loss and heat transfer on chemical conversion is compared for both a smooth and a ribbed reactor in order to conclude about the impact of wall roughness in industrial operating conditions. An optimization methodology, based on series of LES and Gaussian process, is finally developed and an innovative reactor design for thermal cracking applications, which maximizes the chemical yield, is proposed

Pour améliorer l'efficacité des procédés thermiques de craquages et réduire les phénomènes de cokage liés à la température de paroi trop élevée, l'utilisation de tubes nervurés est une technique potentiellement car elle permet d'améliorer le mélange et d'augmenter les transferts de chaleur. Cependant, la perte de charge est significativement augmentée. En raison de la complexité de l'écoulement turbulent, du système chimique et du couplage turbulencechimie, il est difficile d'estimer a priori la perte réelle en termes de sélectivité des tubes nervurés. Les expériences représentatives de laboratoire combinant turbulence, transferts de chaleur et chimie sont très rares et trop coûteuses à l'échelle industrielle. Dans ce travail, l'approche simulation aux grandes échelles résolue à la paroi (WRLES) est utilisée pour étudier écoulement non-réactif puis réactif dans des tubes à la fois lisses et nervurés, pour quantifier leur impact sur la turbulence et sur la chimie. Le code AVBP, qui résout les équations de Navier-Stokes compressibles pour les écoulements turbulents, est utilisé avec des schémas chimique réduites du craquage de l'éthane puis du butane. L'écoulement à la paroi est analysé en détail et comparé pour les deux géométries, fournissant des informations utiles pour le développement ultérieur de modèles de parois pour ce type de rugosité. L'impact de la résolution du maillage et du schéma numérique est également discuté, pour trouver le meilleur compromis entre coût et précision de calcul pour une application industrielle. L'impact des structures d'écoulement turbulent ainsi que leurs effets sur le transfert thermique et le mélange sur les réactions chimique sont étudiés à la fois pour les tubes lisses et les tubes nervurés. Perte de pression, transfert de chaleur et conversion chimique sont finalement comparés. / To improve the efficiency of thermal-cracking processes, and to reduce the coking phenomena due to high wall temperature, the use of ribbed tubes is an interesting technique as it allows better mixing and heat transfer. However it also induces significant increase in pressure loss. The complexity of the turbulent flow, the chemical system, and the chemistry-turbulence interaction makes it difficult to estimate a priori the real loss of ribbed tubes in terms of selectivity. Experiments combining turbulence, heat transfer and chemistry are very rare in laboratories and too costly at the industrial scale. In this work, Wall-Resolved Large Eddy Simulation (WRLES) is used to study non-reacting and reacting flows in both smooth and ribbed tubes, to show the impact of the ribs on turbulence and chemistry. Simulations were performed with the code AVBP, which solves the compressible Navier-Stokes equations for turbulent flows, using reduced chemistry scheme of ethane and butane cracking for reacting cases. Special effort was devoted to the wall flow, which is analyzed in detail and compared for both geometries, providing useful information for further development of roughness-type wall models. The impact of grid resolution and numerical scheme is also discussed, to find the best trade-off between computational cost and accuracy for industrial application. Results investigate and analyze the turbulent flow structures, as well as the effect of heat transfer efficiency and mixing on the chemical process in both smooth and ribbed tubes. Pressure loss, heat transfer and chemical conversion are finally compared.

Submitted by Lúcia Brandão (lucia.elaine@live.com) on 2015-07-15T16:05:00Z No. of bitstreams: 1 Tese - Cristiane Daliassi Ramos de Souza.pdf: 2429333 bytes, checksum: 3abea0012ee786e4320f226b2f591475 (MD5) / Approved for entry into archive by Divisão de Documentação/BC Biblioteca Central (ddbc@ufam.edu.br) on 2015-07-20T15:48:37Z (GMT) No. of bitstreams: 1 Tese - Cristiane Daliassi Ramos de Souza.pdf: 2429333 bytes, checksum: 3abea0012ee786e4320f226b2f591475 (MD5) / Approved for entry into archive by Divisão de Documentação/BC Biblioteca Central (ddbc@ufam.edu.br) on 2015-07-20T15:54:41Z (GMT) No. of bitstreams: 1 Tese - Cristiane Daliassi Ramos de Souza.pdf: 2429333 bytes, checksum: 3abea0012ee786e4320f226b2f591475 (MD5) / Made available in DSpace on 2015-07-20T15:54:42Z (GMT). No. of bitstreams: 1 Tese - Cristiane Daliassi Ramos de Souza.pdf: 2429333 bytes, checksum: 3abea0012ee786e4320f226b2f591475 (MD5) Previous issue date: 2012-11-10 / CAPES - Coordenação de Aperfeiçoamento de Pessoal de Nível Superior / The Jatropha curcas L. is a vegetable species that supplies great amount of oil, but due to its toxicity cannot be used to feed human beings. It is a promising alternative for Biodiesel production. This Thesis had the purpose of perform analytic, thermal and energy studies for the oil extracted from oleaginous species Jatropha curcas L., cultivated in the State of Amazonas. The study was also done for byproducts such as fruit peels, seed peels and the cake originated by biofuel productive chain. To reach the proposed objective, the experimental activities were started with the sampling of the whole fruits in a plantation located in Itacoatiara city-Amazonas. Six independent samplings were done in different months and all the samples were submitted to physical characterization to evaluate size and weight for all parts of the fruit. The process to obtain the oil was done by two methods: mechanical extraction and chemical extraction (Soxhlet system). The chemical extraction was performed for all available samples and the best efficiency was the 50.21%, although all the extractions have presented good results (43-48%). The mechanical process was just performed for the 2010 crop presenting a satisfactory efficiency (33.14%). Then, the oil extracted by the two processes was characterized by several physical-chemical parameters. The oxidative stability by Rancimat was measured for the oils and the result was around 12 hours, this value is considered satisfactory when compared with other species. The fatty acid profile was analyzed by gas chromatography, which indicated the presence of higher concentrations of oleic and linoleic acids. The palmitic, stearic, arachidic and palmitoleic acids were also detected, however in smaller concentrations. The evaluation for thermal and energy potential was done for the oil and byproducts using TG/DTA, immediate analysis and superior heat power techniques. The results of thermal analysis for the oils obtained by chemical and mechanical extraction indicated thermal stability temperature about 180 and 217°C, respectively. Energy evaluation for byproducts was done by immediate analysis and high values for volatile materials were found (65-78%). These values characterize a fuel that can be easy and quickly burned during the combustion process. The results of PCS for the obtained oils presented high values (34-39 MJ/kg), which are close to the ones measured for diesel. For the byproducts, the results were between 17 and 21 MJ/kg, close and even superiors to the literature values for other agricultural residues showing, therefore, great applicability for use in energy generation processes. Finally, reactions with the Jatropha curcas L. oil were made to obtain biofuels through the methylic and ethylic transesterification and thermal cracking. The results for transesterification process were excellent, with efficiency above 90%, however, the physical-chemical evaluation showed that the methylic Biodiesel was the only one in conformity with the Resolution 14/2011 from ANP. A satisfactory efficiency of 75% was obtained for bio-oil. / O pinhão manso é uma espécie vegetal que fornece grande quantidade de óleo e por sua toxidade não pode ser usado na alimentação humana, podendo se transformar em uma alternativa promissora na produção de Biodiesel. Esta Tese teve a finalidade de realizar um estudo analítico, térmico e energético do óleo extraído da espécie oleaginosa pinhão manso (Jatropha curcas L.), cultivada no Estado do Amazonas, assim como dos co-produtos, tais como, cascas do fruto, cascas da semente e torta, presentes na cadeia produtiva de biocombustíveis. Para atingir o objetivo proposto, as atividades experimentais foram iniciadas com a coleta dos frutos na plantação localizada em Itacoatiara-AM. Foram feitas seis coletas em diferentes meses e todas as amostras foram submetidas à caracterização física avaliando o tamanho e a massa para todas as partes do fruto. Em seguida realizou-se o processo de obtenção do óleo, utilizando dois métodos, a extração mecânica e a extração com solvente (Método Soxhlet). A extração com solvente foi realizada para todas as amostras coletadas e o melhor rendimento obtido foi de 50,21%, apesar de ter obtido bons resultados em todas as extrações (43-48%). O processo mecânico foi realizado apenas com o lote da safra de 2010 apresentando um rendimento satisfatório (33,14%). Posteriormente, o óleo extraído foi caracterizado por diversos parâmetros físico-químicos. A estabilidade oxidativa por Rancimat foi realizada para o óleo do pinhão manso ficando em torno de 12 horas, um valor considerado satisfatório quando comparado com outras espécies. O perfil de ácidos graxos foi analisado por cromatografia gasosa, o qual indicou a presença de altas concentrações dos ácidos oléico e linoléico. Os ácidos palmítico, esteárico, araquídico e palmitoléico também foram detectados, porém em concentrações menores. A avaliação do potencial térmico e energético foi realizada para o óleo e os co-produtos utilizando as técnicas de TG/DTA, análise imediata e PCS. Os resultados da análise térmica dos óleos, obtidos via extração química e mecânica, indicaram uma temperatura de estabilidade térmica em torno de 180C e 217C, respectivamente. Na avaliação energética dos co-produtos realizada pela análise imediata houve destaque para o teor de materiais voláteis, que apresentou valores elevados (65-78%), o que caracteriza um combustível mais fácil e rapidamente queimado durante o processo de combustão. Os resultados do PCS para os óleos obtidos apresentaram valores elevados (34-39 MJ/kg) e próximos ao diesel. Para os co-produtos, os resultados ficaram entre 17 e 21 MJ/kg, próximos e até superiores aos valores reportados na literatura para outros resíduos agrícolas mostrando, portanto grande aplicabilidade para utilização em processos de geração de energia. Por fim foram realizadas reações com o óleo de pinhão manso para obter biocombustíveis através da transesterificação metílica e etílica e do craqueamento térmico. Os resultados da transesterificação mostraram-se excelentes, com rendimentos acima de 90%, entretanto a avaliação físico-química mostrou que apenas o Biodiesel metílico ficou em conformidade com a Resolução 14/2011 da ANP. O Bio-óleo obteve um rendimento satisfatório (75%).