O concreto auto-adensável (CAA), que representa um dos mais significativos avanços na tecnologia de concreto, foi desenvolvido no Japão em 1988 com o intuito de se obter estruturas de concreto duráveis. É um concreto que dispensa o processo convencional de vibração ou adensamento por ter a capacidade de fluir e preencher os espaços da fôrma apenas através de seu peso próprio. Desde então, várias pesquisas têm sido realizadas e esse tipo de concreto já vem sendo aplicado na prática há algum tempo em alguns países, principalmente por grandes empresas de construção no Japão e na Suécia. Pesquisas para se estabelecerem métodos racionais de dosagem para CAA bem como métodos de ensaios no estado fresco têm sido desenvolvidas, visando fazer do CAA um concreto de aplicação comum. Contudo, ainda não se conhece bem este material e o que se nota é que a maioria dos CAA apresentados em trabalhos científicos é obtida com altos teores de argamassa, além da grande dispersão desses teores. Neste trabalho foi estudada a influência do teor de argamassa sobre as características de concretos auto-adensáveis, tanto no estado fresco como no estado endurecido, produzidos a partir de diferentes teores de argamassa (55, 60, 65, 70 e 75%). Para a produção dos mesmos foi aplicado um novo método de dosagem para CAA desenvolvido por Tutikian (2004), o qual se mostrou satisfatório no que diz respeito às propriedades de fluxo dos CAA. Em termos de resistências mecânicas os CAA´s obtidos apresentaram comportamentos bem similares uns aos outros para relações a/c aproximadas e mesmo teor de fíler calcário (que substitui parte do teor de agregado miúdo total) . Porém, o consumo de aditivo superplastificante tende a aumentar, para uma mesma fluidez, com o aumento do teor de argamassa, o que se caracteriza pelo aumento da superfície específica da mistura para altos teores de argamassa. Quando comparado com um concreto convencional com mesmo teor de argamassa o CAA apresentou qualidades similares ou ligeiramente superiores, com exceção de seu custo que é superior ao de um concreto convencional. Deste modo, o presente trabalho pretende contribuir para um melhor conhecimento e entendimento do CAA para que o mesmo possa ser aplicado com segurança em edificações e obras corrente de engenharia civil. / Self-compacting concrete (SCC), first developed in Japan in 1988 to achieve durable concrete structures, and adopted in Europe and the rest of the world more recently, represents one of the most significant advances in concrete technology. SCC is a type of concrete that can flow and compact in a mould or formwork under its own weight without the need for vibration. Since then, several research activities have been carried out and this type of concrete has been used in practical structures in Japan and Sweden, mainly by large construction companies. Investigations for establishing rational mix design methods for SCC and self-compactability testing methods have been developed from the point of view of making this new concrete a standard concrete. However, SCC is not well known so far and it can be observed worldwide that most of the SCC has been proportioned with high mortar/paste contents. This work aims to assess the influence of the mortar content in the composition of SCC on its properties, both in fresh and hardened states, produced with five different mortar contents (55, 60, 65, 70, and 75%). The newly-developed mix design method (TUTIKIAN, 2004) was applied to produce all SCC, and it seemed to be a very good method in terms of the SCC flow properties. Concerning the mechanical properties (compressive/tensile strength) all SCC produced in this study have presented similar results related to others with approximate water-to-cement ratio and the same limestone filler content (used to replace part of the total fine aggregate content). It was verified that the superplasticizer dosage increases as the mortar content increases for the same values of flow properties, which can be explained by the greater specific surface of the mixtures as the mortar content increases. Compared to a normal vibrated concrete with the same mortar content in its composition, SCC presented equal or slightly better qualities, excepting the issue of costs which is more expensive than those of the normal vibrated concrete. This dissertation aims to contribute for a better knowledge and understanding of SCC so it can be safely applied in buildings and in civil engineering projects.

Os efeitos produzidos pela interação da radiação ionizante com os circuitos integrados podem ser classificados em efeitos de eventos únicos (Single Event Effects - SEE), comumente relacionados a problemas transientes, e efeitos de dose total ionizante (Total Ionization Dose - TID), os quais se originam em decorrência do longo tempo de exposição à radiação ionizante. Com relação à proteção desses circuitos, técnicas, como redundâncias temporais e espaciais, podem ser aplicadas a fim de reduzir a ocorrência de eventos transientes. Por outro lado, efeitos de TID e mesmo alguns SEE específicos, como os que causam degradações permanentes do circuito, podem ser atenuados drasticamente através de técnicas propostas em nível de layout. Nesse contexto, este trabalho analisa os conceitos básicos envolvidos na interação da radiação com o transistor MOS, desvios de suas características elétricas e técnicas de atenuação dos efeitos acumulativos aplicadas em níveis de arquitetura de sistemas, de processo de fabricação e de dispositivo. Contudo, este trabalho realiza uma abordagem mais detalhada de técnicas de tolerância em nível de layout. A tolerância em nível de layout do transistor é o resultado da combinação entre tecnologia escolhida agregada ao uso de anéis de guarda (guard rings) e aplicação de técnicas em nível de dispositivo como, por exemplo, a de geometria fechada (enclosed-gate). Este trabalho explora diferentes topologias de geometria fechada analisando diferentes modelagens e estimativas de razão de aspecto (W⁄L). Além disso, todas as análises e propostas apresentadas ao longo deste trabalho levam em conta o ambiente de projeto comercial, de forma que os dispositivos e técnicas propostas possam ser aplicadas e fabricadas utilizando ferramentas de projeto comerciais, respeitando restrições quando a dimensões e espaçamentos entre estruturas de acordo com requisitos comerciais de litografia. Os resultados obtidos corroboram o fato de que ao custo de área é possível que se obtenha um dispositivo mais tolerante à radiação e, neste caso, técnicas de mais alto nível ainda podem ser aplicadas de forma a atingir uma maior eficiência de proteção. / Studies related to ionizing radiation effects into MOS transistors are usually classified into two main groups, Single Event Effects (SEE) and Total Ionization Dose (TID). The former is related to transient effects and the later to the permanent effects which occurs during the whole lifetime of integrated circuits and devices. Architecture level for SEE mitigation techniques usually involves redundancy and majority voters, on the other hand, TID mitigation techniques act avoiding or reducing the weak and critical regions in the layout perspective. In this context this work proposes the analysis of primary physical mechanisms of radiation effects in semiconductor components and MOS transistors by exploring the electrical properties and related degradations. The mitigation (or hardening) techniques are explored not only at the architectural level but also by processes improvements. Nonetheless, this work is primarily focused to achieve a radiation hardened circuit by applying specific changes in the layout perspective making the design named as Radiation Hardened by Design (RHBD). Trading the area and circuit density it is possible to harden the most basic building block of electrical circuits (MOS transistors) and, in this case, by applying higher levels of mitigation techniques it is even possible to harden the entire circuit. Hardening by device is a combination of technology node, use of guard rings and techniques such as Enclosed Layout Transistor (ELT). Thus, this work realizes a comparative study of different proposed models to estimate the effective W/L aspect ratio in ELTs. Moreover, the analysis and approaches presented throughout this work take into account the commercial context, i.e., respecting the commercial Process Design Kits rules.

Due to technology scaling, the probability of a high energy radiation particle striking multiple transistors has continued to increase. This, in turn has created a need for new circuit designs that can tolerate multiple simultaneous errors. A common type of error in memory elements is the double node upset (DNU) which has continued to become more common. All existing DNU tolerant designs either suffer from high area and performance overhead, may lose the data stored in the element during clock gating due to high impedance states or are vulnerable to an error after a DNU occurs. In this dissertation, a novel latch design is proposed in which all nodes are capable of fully recovering their correct value after a single or double node upset, referred to as DNU robust. The proposed latch offers lower delay, power consumption and area requirements compared to existing DNU robust designs. Multiple simultaneous radiation induced errors are a current problem that must be studied in combinational logic. Typically, simulators are used early in the design phase which use netlists and rudimentary information of the process parameters to determine the error rate of a circuit. Existing simulators are able to accurately determine the effects when the problem space is limited to one error. However, existing methods do not provide accurate information when multiple concurrent errors occur due to inaccurate approximation of the glitch shape when multiple errors meet at a gate. To improve existing error simulation, a novel analytical methodology to determine the pulse shape when multiple simultaneous errors occur is proposed. Through extensive simulations, it is shown that the proposed methodology matches closely with HSPICE while providing a speedup of 15X. The analysis of the soft error rate of a circuit has continued to be a difficult problem due to the calculation of the logical effect on a pulse generated by a radiation particle. Common existing methods to determine logical effects use either exhaustive input pattern simulation or binary decision diagrams. The problem with both approaches is that simulation of the circuit can be intractably time consuming or can encounter memory blowup. To solve this issue, a simulation tool is proposed which employs partitioning to reduce the execution time and memory overhead. In addition, the tool integrates an accurate electrical masking model. Compared to existing simulation tools, the proposed tool can simulate circuits up to 90X faster.

O concreto auto-adensável (CAA), que representa um dos mais significativos avanços na tecnologia de concreto, foi desenvolvido no Japão em 1988 com o intuito de se obter estruturas de concreto duráveis. É um concreto que dispensa o processo convencional de vibração ou adensamento por ter a capacidade de fluir e preencher os espaços da fôrma apenas através de seu peso próprio. Desde então, várias pesquisas têm sido realizadas e esse tipo de concreto já vem sendo aplicado na prática há algum tempo em alguns países, principalmente por grandes empresas de construção no Japão e na Suécia. Pesquisas para se estabelecerem métodos racionais de dosagem para CAA bem como métodos de ensaios no estado fresco têm sido desenvolvidas, visando fazer do CAA um concreto de aplicação comum. Contudo, ainda não se conhece bem este material e o que se nota é que a maioria dos CAA apresentados em trabalhos científicos é obtida com altos teores de argamassa, além da grande dispersão desses teores. Neste trabalho foi estudada a influência do teor de argamassa sobre as características de concretos auto-adensáveis, tanto no estado fresco como no estado endurecido, produzidos a partir de diferentes teores de argamassa (55, 60, 65, 70 e 75%). Para a produção dos mesmos foi aplicado um novo método de dosagem para CAA desenvolvido por Tutikian (2004), o qual se mostrou satisfatório no que diz respeito às propriedades de fluxo dos CAA. Em termos de resistências mecânicas os CAA´s obtidos apresentaram comportamentos bem similares uns aos outros para relações a/c aproximadas e mesmo teor de fíler calcário (que substitui parte do teor de agregado miúdo total) . Porém, o consumo de aditivo superplastificante tende a aumentar, para uma mesma fluidez, com o aumento do teor de argamassa, o que se caracteriza pelo aumento da superfície específica da mistura para altos teores de argamassa. Quando comparado com um concreto convencional com mesmo teor de argamassa o CAA apresentou qualidades similares ou ligeiramente superiores, com exceção de seu custo que é superior ao de um concreto convencional. Deste modo, o presente trabalho pretende contribuir para um melhor conhecimento e entendimento do CAA para que o mesmo possa ser aplicado com segurança em edificações e obras corrente de engenharia civil. / Self-compacting concrete (SCC), first developed in Japan in 1988 to achieve durable concrete structures, and adopted in Europe and the rest of the world more recently, represents one of the most significant advances in concrete technology. SCC is a type of concrete that can flow and compact in a mould or formwork under its own weight without the need for vibration. Since then, several research activities have been carried out and this type of concrete has been used in practical structures in Japan and Sweden, mainly by large construction companies. Investigations for establishing rational mix design methods for SCC and self-compactability testing methods have been developed from the point of view of making this new concrete a standard concrete. However, SCC is not well known so far and it can be observed worldwide that most of the SCC has been proportioned with high mortar/paste contents. This work aims to assess the influence of the mortar content in the composition of SCC on its properties, both in fresh and hardened states, produced with five different mortar contents (55, 60, 65, 70, and 75%). The newly-developed mix design method (TUTIKIAN, 2004) was applied to produce all SCC, and it seemed to be a very good method in terms of the SCC flow properties. Concerning the mechanical properties (compressive/tensile strength) all SCC produced in this study have presented similar results related to others with approximate water-to-cement ratio and the same limestone filler content (used to replace part of the total fine aggregate content). It was verified that the superplasticizer dosage increases as the mortar content increases for the same values of flow properties, which can be explained by the greater specific surface of the mixtures as the mortar content increases. Compared to a normal vibrated concrete with the same mortar content in its composition, SCC presented equal or slightly better qualities, excepting the issue of costs which is more expensive than those of the normal vibrated concrete. This dissertation aims to contribute for a better knowledge and understanding of SCC so it can be safely applied in buildings and in civil engineering projects.

abstract: Digital systems are essential to the technological advancements in space exploration. Microprocessor and flash memory are the essential parts of such a digital system. Space exploration requires a special class of radiation hardened microprocessors and flash memories, which are not functionally disrupted in the presence of radiation. The reference design ‘HERMES’ is a radiation-hardened microprocessor with performance comparable to commercially available designs. The reference design ‘eFlash’ is a prototype of soft-error hardened flash memory for configuring Xilinx FPGAs. These designs are manufactured using a foundry bulk CMOS 90-nm low standby power (LP) process. This thesis presents the post-silicon validation results of these designs. / Dissertation/Thesis / Masters Thesis Electrical Engineering 2016

abstract: Digital systems are increasingly pervading in the everyday lives of humans. The security of these systems is a concern due to the sensitive data stored in them. The physically unclonable function (PUF) implemented on hardware provides a way to protect these systems. Static random-access memories (SRAMs) are designed and used as a strong PUF to generate random numbers unique to the manufactured integrated circuit (IC). Digital systems are important to the technological improvements in space exploration. Space exploration requires radiation hardened microprocessors which minimize the functional disruptions in the presence of radiation. The design highly efficient radiation-hardened microprocessor for enabling spacecraft (HERMES) is a radiation-hardened microprocessor with performance comparable to the commercially available designs. These designs are manufactured using a foundry complementary metal-oxide semiconductor (CMOS) 55-nm triple-well process. This thesis presents the post silicon validation results of the HERMES and the PUF mode of SRAM across process corners. Chapter 1 gives an overview of the blocks implemented on the test chip 25. It also talks about the pre-silicon functional verification methodology used for the test chip. Chapter 2 discusses about the post silicon testing setup of test chip 25 and the validation of the setup. Chapter 3 describes the architecture and the test bench of the HERMES along with its testing results. Chapter 4 discusses the test bench and the perl scripts used to test the SRAM along with its testing results. Chapter 5 gives a summary of the post-silicon validation results of the HERMES and the PUF mode of SRAM. / Dissertation/Thesis / Masters Thesis Electrical Engineering 2017

Le but de la thèse a été de montrer que les cellules mémoires MRAM présentent de nombreux avantages pour une utilisation en tant que mémoire de configuration pour les architectures reconfigurables et en particulier les FPGAs (Field Programmable Gate Arrays). Ce type de composant est programmable et permet de concevoir un circuit numérique simplement en programmant des cellules mémoires qui définissent sa fonctionnalité. Un FPGA est principalement constitué de cellules mémoires. C'est pourquoi elles déterminent en grande partie ses caractéristiques comme sa surface ou sa consommation et influencent ses performances comme sa rapidité. Les mémoires MRAM sont composées de Jonctions Tunnel Magnétiques (JTMs) qui stockent l'information sous la forme d'une aimantation. Une JTM est composée de trois couches : deux couches de matériaux ferromagnétiques séparées par une couche isolante. Une des deux couches ferromagnétiques a une aimantation fixée dans un certaine direction (couche de référence) tandis que l'autre peut voir son aimantation changer dans deux directions (couche de stockage). Ainsi, la propagation des électrons est changée suivant que les deux aimantations sont parallèles ou antiparallèles c'est-à-dire que la résistance électrique de la jonction change suivant l'orientation relative des aimantations. Elle est faible lorsque les aimantations sont parallèles et forte lorsqu'elles sont antiparallèles. L'écriture d'une JTM consiste donc à changer l'orientation de l'aimantation de la couche de stockage tandis que la lecture consiste à déterminer si l'on a une forte ou une faible résistance. Les atouts de la JTM font d'elle une bonne candidate pour être une mémoire dite universelle, bien que des efforts de recherche restent à accomplir. Cependant, elle a de nombreux avantages comme la non-volatilité, la rapidité et la faible consommation à l'écriture comparée à la mémoire Flash ainsi que la résistance aux radiations. Grâce à ces avantages, on peut déjà l'utiliser dans certaines applications et en particulier dans le domaine du spatial. En effet, l'utilisation dans ce domaine permet de tirer parti de tous les avantages de la JTM en raison du fait qu'elle est intrinsèquement immune aux radiations et non-volatile. Elle permet donc de réaliser un FPGA résistant aux radiations et avec une basse consommation et de nouvelles fonctionnalités. Le travail de la thèse s'est donc déroulé sur trois ans. La première année a d'abord été dédiée à l'état de l'art afin d'apprendre le fonctionnement des JTMs, l'architecture des FPGAs, les techniques de durcissement aux radiations et de basse consommation ainsi que le fonctionnement des outils utilisés en microélectronique. Au bout de la première année, un nouveau concept d'architecture de FPGA a été proposé. Les deuxième et troisième années ont été dédiées à la réalisation de cette innovation avec la recherche de la meilleure structure de circuit et la réalisation d'un circuit de base d'un FPGA ainsi que la conception puis la fabrication d'un démonstrateur. Le démonstrateur a été testé avec succès et a permis de prouver le concept. La nouvelle architecture de circuit de FPGA a permis de montrer que l'utilisation des mémoires MRAM comme mémoire de configuration de FPGA était avantageuse et en particulier pour les technologies futures. / The aim of the thesis was to show that MRAM memory has many advantages for use as a configuration memory for reconfigurable architectures and especially Field Programmable Gate-Arrays (FPGAs). This type of component is programmable and allows designing a digital circuit simply by programming memory cells that define its functionality. An FPGA is thus mainly composed of memory cells. That is why they largely determine its characteristics as its surface or power consumption and affect its performance as its speed. MRAM memories are composed of Magnetic Tunnel Junctions (JTMs) which store information in the form of a magnetization. A JTM is composed of three layers: two layers of ferromagnetic material separated by an insulating layer. One of the two ferromagnetic layers has a magnetization pinned in a fixed direction (reference layer) while the other one can have its magnetization switched between two directions (storage layer). Thus, the propagation of the electrons is changed depending on whether the two magnetizations are parallel or antiparallel that is to say that the electrical resistance of the junction changes according to the orientation of the magnetizations. It is low when the magnetizations are parallel and high when antiparallel. Writing a JTM consists in changing the orientation of the magnetization of the storage layer while reading consists in determining if the resistance is high or low. The advantages of the JTM make it a good candidate to be used as a universal memory although research efforts are still needed. However, it has many advantages such as non-volatility, fast and low power consumption compared to writing to Flash memory as well as resistance to radiation. With these advantages, we may already use it in some applications and in particular in the field of space. Indeed, its use in this area allows taking advantage of all of the benefits of JTM due to the fact that it is intrinsically immune to radiation and non-volatile. It therefore enables to make a radiation hardened and low power FPGA with new functionalities. The work of this thesis is held over three years. The first year was dedicated to the state of the art in order to learn the mechanisms of JTMs, the architecture of FPGAs, radiation hardening and low power consumption techniques as well as the operation of the tools used in microelectronics. After the first year, a new FPGA architecture concept was proposed. The second and third years were devoted to the realization of this innovation with the search for the best circuit structure and the realization of an elementary component of a FPGA and the design and manufacture of a demonstrator. The demonstrator has been successfully tested and proved the new concept. The new circuit architecture of FPGA has shown that the use of MRAM cells as configuration memories for FPGAs was particularly advantageous for future technologies.

Os efeitos produzidos pela interação da radiação ionizante com os circuitos integrados podem ser classificados em efeitos de eventos únicos (Single Event Effects - SEE), comumente relacionados a problemas transientes, e efeitos de dose total ionizante (Total Ionization Dose - TID), os quais se originam em decorrência do longo tempo de exposição à radiação ionizante. Com relação à proteção desses circuitos, técnicas, como redundâncias temporais e espaciais, podem ser aplicadas a fim de reduzir a ocorrência de eventos transientes. Por outro lado, efeitos de TID e mesmo alguns SEE específicos, como os que causam degradações permanentes do circuito, podem ser atenuados drasticamente através de técnicas propostas em nível de layout. Nesse contexto, este trabalho analisa os conceitos básicos envolvidos na interação da radiação com o transistor MOS, desvios de suas características elétricas e técnicas de atenuação dos efeitos acumulativos aplicadas em níveis de arquitetura de sistemas, de processo de fabricação e de dispositivo. Contudo, este trabalho realiza uma abordagem mais detalhada de técnicas de tolerância em nível de layout. A tolerância em nível de layout do transistor é o resultado da combinação entre tecnologia escolhida agregada ao uso de anéis de guarda (guard rings) e aplicação de técnicas em nível de dispositivo como, por exemplo, a de geometria fechada (enclosed-gate). Este trabalho explora diferentes topologias de geometria fechada analisando diferentes modelagens e estimativas de razão de aspecto (W⁄L). Além disso, todas as análises e propostas apresentadas ao longo deste trabalho levam em conta o ambiente de projeto comercial, de forma que os dispositivos e técnicas propostas possam ser aplicadas e fabricadas utilizando ferramentas de projeto comerciais, respeitando restrições quando a dimensões e espaçamentos entre estruturas de acordo com requisitos comerciais de litografia. Os resultados obtidos corroboram o fato de que ao custo de área é possível que se obtenha um dispositivo mais tolerante à radiação e, neste caso, técnicas de mais alto nível ainda podem ser aplicadas de forma a atingir uma maior eficiência de proteção. / Studies related to ionizing radiation effects into MOS transistors are usually classified into two main groups, Single Event Effects (SEE) and Total Ionization Dose (TID). The former is related to transient effects and the later to the permanent effects which occurs during the whole lifetime of integrated circuits and devices. Architecture level for SEE mitigation techniques usually involves redundancy and majority voters, on the other hand, TID mitigation techniques act avoiding or reducing the weak and critical regions in the layout perspective. In this context this work proposes the analysis of primary physical mechanisms of radiation effects in semiconductor components and MOS transistors by exploring the electrical properties and related degradations. The mitigation (or hardening) techniques are explored not only at the architectural level but also by processes improvements. Nonetheless, this work is primarily focused to achieve a radiation hardened circuit by applying specific changes in the layout perspective making the design named as Radiation Hardened by Design (RHBD). Trading the area and circuit density it is possible to harden the most basic building block of electrical circuits (MOS transistors) and, in this case, by applying higher levels of mitigation techniques it is even possible to harden the entire circuit. Hardening by device is a combination of technology node, use of guard rings and techniques such as Enclosed Layout Transistor (ELT). Thus, this work realizes a comparative study of different proposed models to estimate the effective W/L aspect ratio in ELTs. Moreover, the analysis and approaches presented throughout this work take into account the commercial context, i.e., respecting the commercial Process Design Kits rules.

A adição de látex polimérico em argamassas usadas para reparos, argamassas colantes, argamassas técnica decorativas, argamassas de impermeabilização e chapiscos de alto desempenho é prática comum no setor de construção civil, visto que auxiliam seu desempenho no estado endurecido. As modificações do cimento Portland branco com diversos teores (de 5% a 20%) e tipos de látex (etileno vinil acetato, poliacetato de vinil versatato, estireno acrílico e estireno butadieno) resultaram em alterações no estado fresco (cinética de hidratação, cinética de consolidação, teor de ar incorporado) e no estado endurecido (resistência mecânica, elasticidade, absorção de água por capilaridade, permeabilidade ao ar e ao vapor), em muitos casos, proporcionais ao aumento de seus teores. Ao se atingir 20% de adição, em ralação à massa do cimento, houve ganhos expressivos no estado endurecido das pastas, como o aumento da resistência à tração na compressão diametral, e da resistência de aderência, diminuição do módulo elástico e da absorção de água por capilaridade sem comprometer a facilidade à permeabilidade do vapor. Todavia, no estado fresco não apresentaram condições de aplicação devido à excessiva fluidez e diminuição acentuada no processo de consolidação. / Modified Portland cement mortars have been used for repair, stickers, highperformance and finishing of facades is common practice in the construction industry, due his performance in hardened state. Additions of several latex levels (5% to 20%) and types (ethylene vinyl acetate, vinyl poliacetate versatate, styrene acrylic and styrene butadiene) resulted in changes in the fresh state (hydration kinetics, kinetic consolidation, air content) and hardened state (mechanical strength, elasticity, water absorption by capillarity, and steam permeability) and mostly the effects increase with the increase of its levels. When the Latex levels reached 20% in relation of cement were expressive gains in state hardened state, as increased tensile strength in diametral compression, and grip strength, decreased elastic modulus and water absorption by capillarity without compromising ease of vapor permeability. However, in the fresh state did not show application conditions due to the excessive fluidity and strong decrease in the consolidation process.

CoordenaÃÃo de AperfeiÃoamento de Pessoal de NÃvel Superior / O Concreto AutoadensÃvel (CAA) possui propriedades intrÃnsecas que o distingue do atual concreto convencional. SÃo fatores como capacidade de autoadensamento, grande quantidade de finos e uso obrigatÃrio de aditivo superplastificante que tornam o CAA um material de elevado desempenho, favorÃvel para a durabilidade, sendo considerado uma evoluÃÃo na tecnologia do concreto e propenso a se tornar o concreto convencional do futuro. Por outro lado, o resÃduo originÃrio da prÃpria indÃstria da construÃÃo civil tem despertado sÃrias preocupaÃÃes para a comunidade, pois se trata de um resÃduo de difÃcil descarte e gerado em volumes cada vez mais crescentes, dado o crescimento econÃmico do PaÃs com consequente aumento do poder aquisitivo da populaÃÃo. Sob esta Ãtica, analisou-se o potencial de produÃÃo do CAA com substituiÃÃo do agregado graÃdo natural (AGN) por agregados reciclados oriundos da reciclagem de concreto, chamado de agregado graÃdo reciclado (AGR), nas porcentagens de 0%, 10%, 20% e 30%. Sabendo que o agregado reciclado, em geral, possui caracterÃsticas distintas do agregado natural, a metodologia empregada iniciou com o tratamento do AGR e caracterizaÃÃo fÃsica de todos os agregados (convencionais e reciclados). Efetuou-se, entÃo, o estudo de dosagem para as relaÃÃes a/c de 0,35, 0,45 e 0,55. ApÃs, estudaram-se um total de 12 traÃos de CAA para avaliaÃÃo de suas propriedades no estado fresco e no estado endurecido. Os ensaios no estado endurecido foram: resistÃncia à compressÃo axial aos 28 e 56 dias, mÃdulo de elasticidade aos 56 dias, absorÃÃo de Ãgua por imersÃo aos 28 dias, Ãndice de vazios aos 28 dias, massa especÃfica real aos 28 dias e profundidade de carbonataÃÃo natural aos 200 dias. Procedeu-se ao tratamento estatÃstico dos resultados pela anÃlise de variÃncia (ANOVA) com posterior modelagem matemÃtica e ANOVA do modelo proposto. Ao final, concluiu-se que o alto teor de aditivo superplastificante resultante do estudo de dosagem da relaÃÃo a/c mais baixa pode ter influenciado para a obtenÃÃo de concretos mais trabalhÃveis e menos suscetÃveis à incorporaÃÃo de um agregado mais poroso do que o agregado natural. TambÃm se concluiu que as propriedades dos CAA manufaturados foram afetadas mais significativamente pela relaÃÃo a/c, indicando a possibilidade de substituiÃÃo de maiores teores de AGN por AGR. / The self-compacting concrete (SCC) has intrinsic properties that distinguish it known current conventional concrete. It is factors like self-compacting capacity, high amount of fines and mandatory use of superplasticizer that make the SCC a material of high performance, favorable to the durability and is considered an evolution in concrete technology and prone to become the future conventional concrete. On the other hand, the residue originated in the construction industry itself has aroused serious concern to the community, because it is a residue difficult to discard. It is generated in ever-increasing volumes due to economic growth in the country with con sequent increase in power population's purchasing. From this perspective, we analyzed the production of SCC with replacement of natural coarse aggregate (NCA) for recycled aggregates from concrete recycling, called recycled coarse aggregate (RCA), in the percentages of 0%, 10%, 20% and 30%. Knowing that recycled aggregate, in general, has distinct characteristics of natural aggregate, the methodology started with the treatment of RCA and physical characterization of all aggregates (conventional and recycled). Then, it was done the dosage study with the w/c ratio of 0.35, 0.45 and 0.55. After, we studied a total of 12 mixtures of SCC to evaluate its properties in fresh and hardened state. The tests in the hardened state were: compressive strength at 28 and 56 days, modulus of elasticity at 56 days, water absorption by immersion at 28 days, content of voids at 28 days, specific gravity at 28 days and the depth of natural carbonation at 200 days. We proceeded to statistical processing of results by analysis of v ariance (ANOVA) followed by mathematical modeling and model‟s ANOVA. Finally, it was concluded that the high content of superplasticizer results from the dosage study of lower w/c ratio can be influenced to achieve concretes more workable and less sensitiv e to the incorporation of an aggregate more porous than the natural aggregate. It was also found that the properties of the SCC manufactured were affected more significantly by the w/c ratio, indicating the possibility of substitution of higher levels of NCA by RCA