Submitted by Automa??o e Estat?stica (sst@bczm.ufrn.br) on 2015-12-14T21:40:34Z No. of bitstreams: 1 AnaPaulaNascimentoBatistaVieira_DISSERT.pdf: 2831339 bytes, checksum: 8ead5119cedbd7897bd24a9231348c2d (MD5) / Approved for entry into archive by Arlan Eloi Leite Silva (eloihistoriador@yahoo.com.br) on 2015-12-17T18:04:10Z (GMT) No. of bitstreams: 1 AnaPaulaNascimentoBatistaVieira_DISSERT.pdf: 2831339 bytes, checksum: 8ead5119cedbd7897bd24a9231348c2d (MD5) / Made available in DSpace on 2015-12-17T18:04:10Z (GMT). No. of bitstreams: 1 AnaPaulaNascimentoBatistaVieira_DISSERT.pdf: 2831339 bytes, checksum: 8ead5119cedbd7897bd24a9231348c2d (MD5) Previous issue date: 2014-07-28 / A utiliza??o de res?duos tem se tornado uma alternativa na constru??o civil com o intuito de minimizar o impacto ambiental causado pelo grande volume destes descartados no meio ambiente. O res?duo do processo de recauchutagem do pneu ? de dif?cil degrada??o e sua deposi??o em aterros sanit?rios ? invi?vel, al?m de propiciar ? procria??o de insetos nocivos a sa?de humana. Este trabalho tem como objetivo demonstrar a viabilidade de um comp?sito cer?mico contendo fibra de pneu na fabrica??o de blocos para pavimenta??o. Ser?o abordados os processos de fabrica??o e montagem dos blocos produzidos e as v?rias formula??es estudadas com diferentes propor??es entre os elementos constituintes: brita, areia, cimento, e fibra de pneu. Foram determinadas as propriedades mec?nicas das diferentes formula??es. Concluiu-se que a adi??o da fibra de borracha fragilizou o concreto o que p?de ser verificado na an?lise microestrutural obtida atrav?s do MEV, que revelou a presen?a de poros e a baixa ader?ncia entre a fibra e a matriz (fibra de pneu/pasta de cimento). O comp?sito com fibra de pneu mais vi?vel, BCPB1(1/2), pode ser utilizado em locais de solicita??es leves como pra?as, cal?adas, ciclo vias entre outros como tamb?m na fabrica??o de meio fio e sarjetas, por apresentar resist?ncia mec?nica ? compress?o em torno de 20 MPa. / This work aims to demonstrate the feasibility of a ceramic composite containing fiber in the rubber manufacturing interlocking blocks. Gravel, sand, cement, rubber and fiber: the processes of manufacture and assembly of blocks produced and the various formulations studied with different proportions between the constituent elements were addressed. Mechanical properties were determined for the different formulations, compressive strength, diametral compressive strength, water absorption and apparent density, obeying the rules related to each property. It was concluded that the addition of rubber fiber gave the concrete studied resistance lower than conventional concrete which can be verified on the microstructural analysis obtained by SEM, which revealed the presence of pores and the low adhesion between the fiber and the matrix compression (tire fiber / cement paste). The composite of more viable tire BCPB1 (1/2) fiber can be used in places requests as light squares, pavements, roads and other cycle as well as in the manufacture of the curb and gutter, by having compressive strength in about 20 MPa

Submitted by Automa??o e Estat?stica (sst@bczm.ufrn.br) on 2016-01-05T16:51:31Z No. of bitstreams: 1 AndreLuizLopesToledo_DISSERT.pdf: 3174228 bytes, checksum: f818f27305b477f7bd49409718209f31 (MD5) / Approved for entry into archive by Arlan Eloi Leite Silva (eloihistoriador@yahoo.com.br) on 2016-01-07T21:53:38Z (GMT) No. of bitstreams: 1 AndreLuizLopesToledo_DISSERT.pdf: 3174228 bytes, checksum: f818f27305b477f7bd49409718209f31 (MD5) / Made available in DSpace on 2016-01-07T21:53:38Z (GMT). No. of bitstreams: 1 AndreLuizLopesToledo_DISSERT.pdf: 3174228 bytes, checksum: f818f27305b477f7bd49409718209f31 (MD5) Previous issue date: 2014-11-17 / A perfura??o de po?os para extra??o de petr?leo gera, entre outros res?duos, fragmentos de rochas e solos. Estes fragmentos s?o denominados cascalho de perfura??o de petr?leo ou simplesmente res?duo de perfura??o de petr?leo. Nos locais de explora??o onshore s?o formados grandes dep?sitos de cascalho de perfura??o, material de onerosa destina??o final. Sendo assim, este trabalho apresenta uma pesquisa com o objetivo de avaliar o emprego de res?duo de perfura??o misturado a um solo later?tico, como material comp?sito a ser utilizado na execu??o de aterros compactados em obras de terra. Solo e res?duo foram avaliados atrav?s de difra??o de raios X (DRX), fluoresc?ncia de raios X (FRX) e mediante ensaios de laborat?rio tradicionalmente empregados na mec?nica dos solos, como, an?lise granulom?trica, determina??o de limite de liquidez e de plasticidade e ensaios de compacta??o. Ap?s a caracteriza??o de solo e res?duo individualmente foram estudadas misturas de solo e res?duo, segundo as dosagens de 2,5%, 5%, 10%, e 15% de res?duo em rela??o ? massa de solo seco. Essas misturas foram submetidas aos ensaios de compacta??o, CBR, cisalhamento direto e adensamento. Os resultados dos ensaios foram comparados com as normas vigentes do DNIT para execu??o de aterros compactados. Os resultados encontrados nos ensaios das misturas atendem aos par?metros m?nimos necess?rios, permitindo, sob o ponto de vista da an?lise geot?cnica, a utiliza??o dessas misturas para execu??o de aterros compactados / The drilling of wells for petroleum extraction generates rocks and soils fragments, among other residues. These fragments are denominated petroleum drilling gravel or simply petroleum drilling residue. On the sites of onshore exploration are formed big deposits of drilling gravel, an expensive final destination material. This work aims at evaluating the addition of drilling residue to a lateritic soil, as composite material, for construction of compacted fills for earth work projects. Soil and residue were evaluated by X-ray diffraction (XRD) and X-ray fluorescence (XRF) and by laboratory tests traditionally used in soil mechanics, as particle-size analysis of soils, determination of liquid and plasticity indexes and compaction test. After soil and residue characterization, soil-residue mixtures were studied, using dosages of 2,5%, 5%, 10%, and 15% of residue in relation to the dry soil mass. These mixtures were submitted to compaction test, CBR, direct shear test and consolidation test. The test results were compared to the current legislation of DNIT for compacted fill construction. The results showed that the mixtures presented the minimal necessary parameters, allowing, from the point of view of geotechnical analysis, the use of these mixtures for construction of compacted fills

Submitted by Automa??o e Estat?stica (sst@bczm.ufrn.br) on 2016-02-01T21:32:18Z No. of bitstreams: 1 NatanaeyfleRandembergGomesDosSantos_TESE.pdf: 3542697 bytes, checksum: 97843b739f0b1a5bdcb53b7f88ac2d7a (MD5) / Approved for entry into archive by Elisangela Moura (lilaalves@gmail.com) on 2016-02-16T20:41:39Z (GMT) No. of bitstreams: 1 NatanaeyfleRandembergGomesDosSantos_TESE.pdf: 3542697 bytes, checksum: 97843b739f0b1a5bdcb53b7f88ac2d7a (MD5) / Made available in DSpace on 2016-02-16T20:41:39Z (GMT). No. of bitstreams: 1 NatanaeyfleRandembergGomesDosSantos_TESE.pdf: 3542697 bytes, checksum: 97843b739f0b1a5bdcb53b7f88ac2d7a (MD5) Previous issue date: 2015-02-05 / A utiliza??o de materiais comp?sitos para a constru??o civil tem sido tema de in?meros trabalhos cient?ficos no Brasil e no mundo. Um dos fatores que motivam essa busca ? o d?ficit habitacional que os pa?ses principalmente do terceiro mundo enfrentam. No Brasil esse d?ficit alcan?a mais de 6,5 milh?es de moradias, em torno de 12% dos domic?lios do pa?s. Esse trabalho apresenta um comp?sito que foi obtido a partir de res?duos gerados nos processos de obten??o de placas de granito e m?rmore, cimento, gesso, areia, EPS triturado e ?gua. Esses res?duos causam grandes danos ao meio ambiente e s?o jogados em aterros em grandes quantidades. O ineditismo do trabalho est? no estudo combinado t?rmico, mec?nico e ac?stica do comp?sito obtido, em situa??o real, de c?modos que fazem parte de uma habita??o experimental. Foram confeccionados diversos blocos a partir de composi??es variadas e foram efetuados testes preliminares de resist?ncia mec?nica e t?rmica, escolhendo-se a propor??o mais apropriada. Ser?o apresentados os processos de fabrica??o e montagem dos blocos produzidos, em n?mero de 500, para a fabrica??o de uma resid?ncia experimental. Estudou-se qual o tipo de bloco e de res?duo, m?rmore ou granito, apresentou-se mais vi?vel para o fim proposto. A resist?ncia mec?nica dos blocos produzidos esteve acima de 3,0 MPa. A resist?ncia t?rmica dos blocos foi comprovada pela diferen?a m?xima entre as paredes interna e externa dos c?modos edificados em torno 8,0 ?C. A absor??o ac?stica para o c?modo mais eficiente ficou em torno 31. Demonstrou-se a viabilidade de utiliza??o dos blocos fabricados com o material comp?sito proposto para a constru??o civil. / The use of composite materials for the construction industry has been the subject of numerous scientific papers in Brazil and in the world. One of the factors that motivate this quest is the housing deficit that countries especially the third world face. In Brazil this deficit reaches more than 6.5 million homes, around 12% of all US households . This paper presents a composite that was obtained from waste generated in processes for the production of granite and marble slabs, cement, gypsum, sand, crushed EPS and water. These wastes cause great damage to the environment and are thrown into landfi lls in bulk. The novelty of the work is in the combined study thermal, mechanical and acoustic composite obtained in real situation of rooms that are part of an experimental housing. Many blocks were made from cement compositions, plaster, foam, sand, marb le and / or granite, preliminary tests of mechanical and thermal resistance were made by choosing the most appropriate proportion. Will be given the manufacturing processes and assembly units 500 units 10 x 80 x 28 cm produced for the construction of an ex perimental home. We studied what kind of block and residue, marble or granite, made it more feasible for the intended purpose. The mechanical strength of the produced blocks were above 3.0 MPa. The thermal resistance of the blocks was confirmed by the maxi mum temperature difference between the inner and outer walls of rooms built around 8.0 ? C. The sound absorption for optimal room was around 31%. Demonstrated the feasibility of using the blocks manufactured with composite material proposed for construction.

Submitted by Automa??o e Estat?stica (sst@bczm.ufrn.br) on 2016-02-01T21:38:49Z No. of bitstreams: 1 AndreiaSoutoVieira_TESE.pdf: 4014793 bytes, checksum: f647646c73f331bc54665695776863d8 (MD5) / Approved for entry into archive by Elisangela Moura (lilaalves@gmail.com) on 2016-02-16T21:17:02Z (GMT) No. of bitstreams: 1 AndreiaSoutoVieira_TESE.pdf: 4014793 bytes, checksum: f647646c73f331bc54665695776863d8 (MD5) / Made available in DSpace on 2016-02-16T21:17:02Z (GMT). No. of bitstreams: 1 AndreiaSoutoVieira_TESE.pdf: 4014793 bytes, checksum: f647646c73f331bc54665695776863d8 (MD5) Previous issue date: 2014-11-28 / Conselho Nacional de Desenvolvimento Cient?fico e Tecnol?gico - CNPq / O Brasil ? um dos maiores produtores de frutas do mundo, sendo a maior parte desta produ??o destinada para o consumo "in natura" ou processada na ind?stria de polpas e sucos. Ao longo da cadeia produtiva das frutas, as perdas quantificadas somam valores significativos, principalmente em raz?o dos efeitos associados ao clima, ao armazenamento e transporte, a sazonalidade e mercado consumidor, etc. Em particular, na ind?stria de polpas e sucos, o aproveitamento da fruta ? de aproximadamente 50% em massa, sendo o restante descartado na forma de res?duo industrial. Por serem ricos em nutrientes, os res?duos de frutas, quando processados de forma adequada, podem gerar produtos com importante valor de mercado. Neste contexto, a secagem constitui um do processos alternativos para o aproveitamento de res?duos de frutas. Por?m, a despeito do ganho que a secagem pode proporcionar aos res?duos, tal processo demanda uma quantidade significativa de energia e, em geral, apresenta limita??es de efici?ncia t?rmica. Desta forma, o monitoramento e controle das principais vari?veis no processo de secagem s?o importantes para garantir condi??es operacionais que permitam obter um produto final dentro de especifica??es de qualidade e com menor custo energ?tico. Assim, a aplica??o de modelos matem?ticos do processo representa uma ferramenta importante para a avalia??o e busca de condi??es ?timas.O presente trabalho teve como objetivo principal avaliar o comportamento da secagem de res?duo industrial de polpa de goiaba num sistema batelada do tipo secador convectivo de bandejas com enfoque no estudo experimental e avalia??o do processo atrav?s da modelagem matem?tica. No estudo experimental, a secagem numa s?rie de bandejas e o consumo energ?tico foram avaliados como resposta aos efeitos das condi??es operacionais (temperatura, vaz?o do ar de secagem e massa de s?lidos). Os resultados obtidos permitiram observar as vari?veis que apresentam um efeito mais significativo sobre o processo. Por outro lado, com base num modelo matem?tico fenomenol?gico implementado computacionalmente e validado com os dados experimentais, foi poss?vel acompanhar a evolu??o da umidade e temperatura nas fases s?lido e g?s em cada bandeja e, a partir de simula??es, foi poss?vel investigar estrat?gias operacionais ?timas, visando encontrar um procedimento favor?vel ? minimiza??o do tempo de processamento e, conseq?entemente, menor gasto energ?tico. / Actually, Brazil is one of the larger fruit producer worldwide, with most of its production being consumed in nature way or either as juice or pulp. It is important to highlig ht in the fruit productive chain there are a lot lose due mainly to climate reasons, as well as storage, transportation, season, market, etc. It is known that in the pulp and fruit processing industy a yield of 50% (in mass) is usually obtained, with the other part discarded as waste. However, since most this waste has a high nutrient content it can be used to generate added - value products. In this case, drying plays an important role as an alternative process in order to improve these wastes generated by the fruit industry. However, despite the advantage of using this technique in order to improve such wastes, issues as a higher power demand as well as the thermal efficiency limitation should be addressed. Therefore, the control of the main variables in t his drying process is quite important in order to obtain operational conditions to produce a final product with the target specification as well as with a lower power cost. M athematical models can be applied to this process as a tool in order to optimize t he best conditions. The main aim of this work was to evaluate the drying behaviour of a guava industrial pulp waste using a batch system with a convective - tray dryer both experimentally and using mathematical modeling. In the experimental study , the dryin g carried out using a group of trays as well as the power consume were assayed as response to the effects of operational conditions (temperature, drying air flow rate and solid mass). Obtained results allowed observing the most significant variables in the process. On the other hand, the phenomenological mathematical model was validated and allowed to follow the moisture profile as well as the temperature in the solid and gas phases in every tray. Simulation results showed the most favorable procedure to o btain the minimum processing time as well as the lower power demand.

Submitted by Automa??o e Estat?stica (sst@bczm.ufrn.br) on 2016-02-05T22:39:44Z No. of bitstreams: 1 HildericaLimaCampos_DISSERT.pdf: 1518298 bytes, checksum: 41cac6ede5b5c76dd7cadea1205d049e (MD5) / Approved for entry into archive by Arlan Eloi Leite Silva (eloihistoriador@yahoo.com.br) on 2016-02-16T19:46:12Z (GMT) No. of bitstreams: 1 HildericaLimaCampos_DISSERT.pdf: 1518298 bytes, checksum: 41cac6ede5b5c76dd7cadea1205d049e (MD5) / Made available in DSpace on 2016-02-16T19:46:12Z (GMT). No. of bitstreams: 1 HildericaLimaCampos_DISSERT.pdf: 1518298 bytes, checksum: 41cac6ede5b5c76dd7cadea1205d049e (MD5) Previous issue date: 2015-02-09 / Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior - CAPES / O tratamento de ?gua para abastecimento ? considerado como um grande benef?cio, tendo em vista que, se for realizado de forma eficiente, propicia sa?de ?s pessoas. Entretanto, ao considerar que uma ETA (Esta??o de Tratamento de ?gua) ? uma ind?stria, pois em seu processo produtivo h? insumos e res?duos, ? necess?rio que haja avalia??o e monitoramento constantes em cada ETA para verificar a melhor e mais adequada maneira de tratar e dispor seus res?duos, minimizando, portanto, os potenciais impactos ao meio ambiente. Os res?duos mais relevantes em ETA de filtra??o r?pida s?o os provenientes das ?guas de lavagem de filtros. A realidade mais observada em nosso pa?s ? o lan?amento destes res?duos (sem tratamento) em mananciais, os quais s?o utilizados, na maioria das vezes, como fonte de abastecimento de uma popula??o a jusante. O presente estudo avaliou indicadores quantitativos e qualitativos de ?gua de lavagem de filtros em tr?s ETA - Itaitinga, Maranguape e Pacatuba. Verificou-se que a ETA Maranguape, em termos de capacidade instalada, ? a de maior porte. A ETA Itaitinga ? a que mais consome ?gua na lavagem de filtros. A ETA Pacatuba exibiu maior concentra??o de s?lidos sediment?veis e suspensos totais, al?m de demanda qu?mica de oxig?nio e alum?nio na ?gua de lavagem dos filtros. Os par?metros s?lidos sediment?veis e s?lidos suspensos totais de todas as ETA estavam fora do padr?o de lan?amento de efluentes em corpo aqu?tico preconizado pela resolu??o 154/2002 da SEMACE (Superintend?ncia Estadual do Meio Ambiente do Cear?). Conclui-se que a ?gua de lavagem dos filtros das ETA em estudo ultrapassam os valores permitidos em legisla??o para serem descartados diretamente em manancial. Sugere-se como alternativa de tratamento de res?duos, a constru??o de lagoas de sedimenta??o de lodo e ainda, como forma de reaproveitamento da ?gua, o processo de recircula??o. / The water supply and treatment is considered as a great benefit considering that, if done efficiently, provides public health. However, considering the WTP (Water Treatment Plant) is an industry, with its inputs and waste generation, they must be constantly evaluated and monitored to verify the best and most appropriate way to process and dispose their waste, minimizing therefore the potential impacts to the environment. By volume, the most significant waste is the rapid filter backwash water. It is very common the disposal of this waste without treatment in water sources, which are used, for the most part, as a water supply source of a downstream population. This study evaluated quantitative and qualitative parameters in filter backwash water in three WTP - Itaitinga, Maranguape and Pacatuba, located in Cear? State, northeast of Brazil. It was found that the Maranguape WTP, in terms of treatment capacity, is the larger. The Itaitinga WTP is the one that consumes more water during filters washing. The Pacatuba WTP exhibited higher concentration of total suspended and settleable solids, COD and aluminum in the filters backwash water. It is noteworthy that the settleable solids and total suspended solids in all three WTP are above the effluent discharge standard recommended by Resolution 154/2002 of SEMACE (State Superintendent of Environment of Cear?). It was concluded that the filter backwash water from the study WTP exceeded the allowed values for legislation to be disposed directly into surface water bodies. It is suggested as an alternative to treat and recycle the filter backwashing water the construction of sludge settling ponds.

Submitted by Automa??o e Estat?stica (sst@bczm.ufrn.br) on 2016-02-22T23:50:58Z No. of bitstreams: 1 AndreAugustoNobregaDantas_DISSERT.pdf: 2471770 bytes, checksum: 3f4777f912d3ae957e3004f2f09714c8 (MD5) / Approved for entry into archive by Arlan Eloi Leite Silva (eloihistoriador@yahoo.com.br) on 2016-02-26T21:24:22Z (GMT) No. of bitstreams: 1 AndreAugustoNobregaDantas_DISSERT.pdf: 2471770 bytes, checksum: 3f4777f912d3ae957e3004f2f09714c8 (MD5) / Made available in DSpace on 2016-02-26T21:24:22Z (GMT). No. of bitstreams: 1 AndreAugustoNobregaDantas_DISSERT.pdf: 2471770 bytes, checksum: 3f4777f912d3ae957e3004f2f09714c8 (MD5) Previous issue date: 2015-02-25 / Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior - CAPES / A minera??o no Brasil possui papel fundamental no desenvolvimento econ?mico e social, contribuindo diretamente na melhoria de vida da popula??o. Entretanto, a atividade mineradora ainda que seja feita de forma respons?vel e com um estudo adequado de gest?o de res?duos para diminuir o impacto dos seus efeitos, pode vir a causar danos nocivos ao meio ambiente. Outras formas de polui??o tamb?m s?o geradas devido ? atividade mineradora. A polui??o visual, provocada, pelo armazenamento dos res?duos a c?u aberto, al?m da polui??o sonora, provocada pelo barulho excessivo das m?quinas tanto na extra??o do min?rio, como no beneficiamento. Uma forma alternativa de diminuir os impactos ambientais provocados pela minera??o ? a utiliza??o dos res?duos nas camadas que ir?o compor os pavimentos das rodovias. Ent?o, este trabalho se prop?e a dar uma destina??o adequada aos res?duos oriundos do beneficiamento do min?rio de ferro, decorrentes da atividade mineradora do grupo de minera??o Mhag Servi?os e Minera??o S/A e Minera??o, na mina do Bonito, localizada no munic?pio de Jucurutu, no estado do Rio Grande do Norte. Os res?duos do min?rio de ferro foram estabilizados com um solo granular proveniente do munic?pio de Maca?ba, tamb?m no estado do Rio Grande do Norte, o qual est? sendo utilizado da duplica??o da BR- 304 referente ao trecho intitulado de Reta Tabajara. O presente trabalho foi desenvolvido em tr?s etapas, sendo a primeira dividida pelos ensaios qu?micos e mineral?gicos, pelos ensaios de caracteriza??o f?sica e pelos ensaios de pavimenta??o para os res?duos do min?rio de ferro. A segunda etapa corresponde aos mesmos ensaios, sendo realizado para o solo granular. A terceira etapa contempla os ensaios citados para tr?s diferentes misturas de res?duos de min?rio de ferro e solo granular, sendo elas: 15% de res?duos de min?rio de ferro e 85% de solo granular, 25% de res?duos de min?rio de ferro e 75% de solo granular, 50% de res?duos de min?rio de ferro e 50% de solo granular. Foi verificada a viabilidade t?cnica da utiliza??o dos res?duos oriundos do beneficiamento do min?rio de ferro, compactado na energia intermedi?ria e modificada, para utiliza??o em camadas de base, sub-base, refor?o de subleito e subleito. A incorpora??o dos res?duos oriundos do beneficiamento do min?rio de ferro em rodovias proporcionar? uma alternativa ao uso de agregados convencionalmente utilizados na pavimenta??o, al?m de preservar o meio ambiente. / Mining in Brazil has a key role in economic and social development, contributing directly to improve the lives of the population. However, the mining activity even if done responsibly and with a proper study of waste management to reduce the impact of its effects, may cause harmful damage to the environment. Other forms of pollution are also caused due to mining activity. The visual pollution caused by the waste storage at open sky, in addition to the noise pollution caused by the excessive noise of the machines both in the extraction of ore, as in processing. An alternative way to lessen the environmental impacts caused by mining is the use of waste in layers that will compose the pavements along the highways. Thus, this work sets out to give a proper disposal of the wastes from the processing of iron ore, resulting from the mining activity of the group of mining Mhag Services and Mining S/A, in the mine of Bonito, located in Jucurutu, a town in the state of Rio Grande do Norte. The residues of the iron ore were stabilized with a granular soil from the city of Macaiba, also in the state of Rio Grande do Norte, which is being used in the duplication of the BR-304 referring to the entitled passage of Reta Tabajara. The present work was developed in three stages, being the first one divided by the chemical and mineralogical tests, by the tests of physical characterization and by the tests of paving for the residues of the iron ore. The second stage corresponds to the same tests being performed for granular soil. The third stage includes the essays abovementioned for three different mixtures of iron ore waste and granular soil, being they: 15% of iron-ore waste and 85% of granular soil, 25% of iron-ore waste and 75% of granular soil, 50% of iron-ore waste and 50% of granular soil. The technical feasibility of using waste from the iron ore beneficiation was checked, compressed in the intermediate energy and modified for use in base layers, sub-base, reinforcement subgrade and subgrade. The incorporation of the residues originating from the improvement of the iron ore in highways will provide an alternative to the use of aggregate conventionally used in the paving, besides preserving the environment.

Submitted by Automa??o e Estat?stica (sst@bczm.ufrn.br) on 2016-02-22T23:54:36Z No. of bitstreams: 1 MarcioGleybsonDaSilvaBezerra_DISSERT.pdf: 1420756 bytes, checksum: 8d219d0675a06760794340515ed8a28f (MD5) / Approved for entry into archive by Arlan Eloi Leite Silva (eloihistoriador@yahoo.com.br) on 2016-02-26T21:50:40Z (GMT) No. of bitstreams: 1 MarcioGleybsonDaSilvaBezerra_DISSERT.pdf: 1420756 bytes, checksum: 8d219d0675a06760794340515ed8a28f (MD5) / Made available in DSpace on 2016-02-26T21:50:40Z (GMT). No. of bitstreams: 1 MarcioGleybsonDaSilvaBezerra_DISSERT.pdf: 1420756 bytes, checksum: 8d219d0675a06760794340515ed8a28f (MD5) Previous issue date: 2014-08-28 / O Brasil ? o segundo maior produtor de mandioca do mundo, da qual a maior parte da produ??o ? utilizada para fabricar farinha e f?cula, gerando grande quantidade de res?duo, a manipueira. Em geral, esse res?duo ? descartado diretamente no solo e cursos d??gua, causando s?rios impactos ambientais. Diante disto, objetivou-se avaliar o uso de ?gua residu?ria da mandioca (manipueira) como fertilizante org?nico em pasto de Brachiaria brizantha cv. Marandu. O experimento foi conduzido no Campus de Maca?ba da Universidade Federal do Rio Grande do Norte. O delineamento experimental foi em blocos ao acaso com seis tratamentos e quatro repeti??es. Os tratamentos utilizados foram doses crescentes de manipueira (0; 15; 30; 60 e 120 m? ha-1 ) e um tratamento com aduba??o mineral (AM) na forma de NPK (140:30:120 kg ha-1 ). Foram realizados tr?s cortes com intervalo de 60 dias. As vari?veis avaliadas foram: altura da planta; ac?mulo de componentes morfol?gicos da forragem; Intercepta??o de Luz (IL); ?ndice de ?rea Foliar (IAF); Clorofila Total (CT); Produ??o de Mat?ria Seca (PMS). A produ??o de mat?ria seca na dose de 120 m? ha-1 teve um acr?scimo quantitativo, totalizando uma produ??o de 2796 kg ha -1 de MS no segundo corte, proporcionando um aumento de 493% em rela??o a testemunha, e o efeito residual observado no terceiro corte promoveu um acr?scimo de 100 % quando comparado a ?0? m? ha-1 . Comparando-se a PMS obtida com a utiliza??o de AM e os demais tratamentos observou-se que no segundo corte ela foi equivalente ? dose de 120 m? ha-1 e no terceiro corte a equival?ncia foi com as doses 60 e 120 m? ha-1 . Para as vari?veis altura da planta, IL, IAF, CT e Massa de Folhas a adi??o de manipueira no solo promoveu um aumento linear positivo para os tr?s cortes. Por?m, com a AM o IAF se mostrou superior aos demais tratamentos. A massa de colmo atingiu sua maior produ??o (838 kg ha-1 de MS) no segundo corte quando se utilizou a dose de 120 m? ha-1 . Na massa de material morto, no segundo e terceiro cortes, verificou-se resposta linear positiva totalizando aumento de 322 e 452% respectivamente, em rela??o ? dose ?0? m? ha-1 . O uso da manipueira apresentou efeito herbicida para a vari?vel massa das indesej?veis, resultando em resposta linear negativa diminuindo a quantidade com o aumento das doses do res?duo. A manipueira pode ser utilizada como fertilizante org?nico em pastagem de Brachiaria brizantha cv. Marandu visando melhorias nas caracter?sticas produtivas, pois promoveu aumentos significativos na maioria das vari?veis estudadas, principalmente na dose de 120 m? ha-1. . / Brazil is the world's second largest producer of cassava, which most of the production is used to make flour and starch, generating large amounts of waste, cassava. In general, this waste is disposed of directly into the soil and waterways, causing serious environmental impacts. In view of this, the aim of this work was to evaluate the use of cassava wastewater water (cassava) as organic fertilizer in Brachiaria brizantha pasture. Marandu. The experiment was conducted at the Campus Maca?ba the Federal University of Rio Grande do Norte. The treatments were increasing rates of cassava, applied to the soil as organic fertilizer. The experimental design was a randomized block design with six treatments and four replications. The treatments consist of cassava doses (0, 15, 30, 60 and 120 m? ha- 1 ) and a treatment with mineral fertilizer (AM) in the form of NPK (140: 30: 120 kg ha-1 ). Three cuts with an interval of 60 days were carried out. The variables evaluated were: plant height; accumulation of morphological components of fodder; Trapping Light (IL); Leaf Area Index (LAI); Total chlorophyll (CT); Feature Production Seca (PMS). The dry matter production at a dose of 120 m?ha-1 had a quantitative increase, with a total production in 2796 kg ha-1 DM in the second cut, providing an increase of 493% compared to control, and the residual effect observed in the third cut caused a 100% increase compared to 0 m? ha-1 . Comparing the PMS obtained with the use of AM and other treatments it was observed that it was the second cut equivalent to a dose of 120 m? ha-1 and the third equivalence has been cut at doses 60 and 120 m?ha-1. For the variables plant height, IL, IAF, CT and leaves Mass adding cassava in the soil promoted a positive linear increase for the three cuts. However, with the AM the IAF was superior to the other treatments. The thatched mass reached its highest production (838 kg ha-1 DM) in the second cut when using a dose of 120 m?ha-1 . In dead material mass in the second and third sections, there was increased linearly increased total of 322 and 452% respectively, compared to a dose of 0 m?ha-1 . The use of cassava showed herbicidal effect for the variable mass of the undesirable negative linear response resulting in decreasing the amount of residue with increasing doses. Manipueira can be used as organic fertilizer in Brachiaria brizantha cv. Marandu for improvements in the productive characteristics, as promoted significant increases in 8 most of the variables studied, especially at a dose of 120 m?ha-1 . This benefits the environment by being alternative for disposal of cassava.

Submitted by Automa??o e Estat?stica (sst@bczm.ufrn.br) on 2016-03-22T00:17:59Z No. of bitstreams: 1 JoelNogueiraGoncalves_TESE.pdf: 6906770 bytes, checksum: 9b8cff5d1a328939a9f33db88bfb62ff (MD5) / Approved for entry into archive by Arlan Eloi Leite Silva (eloihistoriador@yahoo.com.br) on 2016-03-22T22:13:02Z (GMT) No. of bitstreams: 1 JoelNogueiraGoncalves_TESE.pdf: 6906770 bytes, checksum: 9b8cff5d1a328939a9f33db88bfb62ff (MD5) / Made available in DSpace on 2016-03-22T22:13:02Z (GMT). No. of bitstreams: 1 JoelNogueiraGoncalves_TESE.pdf: 6906770 bytes, checksum: 9b8cff5d1a328939a9f33db88bfb62ff (MD5) Previous issue date: 2015-02-24 / A ind?stria de isoladores el?tricos cer?micos utiliza mat?rias primas nobres como argilas de queima branca silicosas e ou aluminosas, com a finalidade de oferecer plasticidade a massa e contribuir nas propriedades el?tricas e mec?nicas requeridas ao produto, e o feldspato com a fun??o de fundente. Na composi??o das massas a literatura indica que a argila participa com percentuais entre 20 e 32, e o feldspato de 8 a 35, sendo materiais de custos significativos. Nesta pesquisa foi realizada a substitui??o total da argila comercial, pela argila de queima branca da regi?o de Santa Luzia no sul da Bahia e substitui??o parcial do feldspato pelo res?duo de cinza da queima da casca de caf? conilon, da regi?o extremo sul da Bahia. O objetivo das substitui??es destes materiais foi comprovar sua viabilidade t?cnica, bem como focar aten??o da ind?stria cer?mica para o embri?o de p?lo cer?mico existente na regi?o sul e extremo sul da Bahia, que possui reservas significativas de materiais nobres como a argila de queima branca de Santa Luzia, caulins, quartzos e feldspatos, al?m de gerar volume significativo do fundente alternativo, res?duo de cinza de queima da casca de caf? conilon. A argila Santa Luzia ? mat?ria prima nobre cuja atual aplica??o comercial ? na produ??o de telhas brancas. O fundente res?duo de cinza de casca de caf? ? descartado nos locais de produ??o com impacto ambiental negativo. Foram utilizados diagramas de fase e delineamento de misturas para otimiza??o e redu??o de custos na pesquisa. Os resultados comprovaram as expectativas de obten??o de isoladores el?tricos cer?micos com a argila de queima branca de Santa Luzia, e substitui??o de at? 35,4 % do feldspato, por res?duo tratado de cinza de queima de casca de caf? conilon. O delineamento de misturas que apresentou os melhores resultados foi para a formula??o com percentuais de: argila 26,4 a 30,4%; caulim 14,85 a 17,1%; feldspato de 12,92 a 16,96%; res?duo R2 de 7,08 a 9,2% e quartzo de 32,5 a 38,75%, percentuais em rela??o ? massa total da mistura. Os melhores resultados indicados pelo modelo do delineamento de misturas foram; porosidade 0,2 a 1,4%, absor??o de ?gua de 0,1 a 0,7%, resist?ncia mec?nica ? flex?o de 35 a 45 MPa, rigidez diel?trica de 35 a 41 kV/cm, resistividade transversal de 8x109 a 2,5x1010 ?.cm e a constante diel?trica ? /?0 de 7 a 10,4, atendendo aos par?metros para fabrica??o de isoladores el?tricos cer?micos de baixa e m?dia tens?o. / The electrical ceramic insulators industry, uses noble raw materials such as siliceous and aluminous clays of white burning, in order to provide plasticity of the mass and contribute to electrical and mechanical properties required of the product, and feldspar with the flux function In literature references the composition of the masses indicates that the clay participates in percentage between 20 and 32, and feldspar 8 to 35, these materials have significant cost. In this research was performed the total replacement of commercial clay, for white burning clay from Santa Luzia region in southern Bahia and partial replacement of feldspar by ash residue of husk conilon coffee burning, from extreme south of Bahia. The objective of replacement these raw materials is to aver its technical feasibility and call attention for the embryo pole of ceramic industry for the existing in the south and extreme south of Bahia, which has significant reserves of noble raw materials such as clay white burning, kaolin, quartz and feldspar, and generates significant volume of gray husk conilon coffee as alternate flux. Clay Santa Luzia is prima noble material whose current commercial application is the production of white roofing. The residue of coffee husk ash is discarded near of production sites and is harmful to the environment. Phase diagrams and statistic design of experiments, were used for optimization and cost savings in research. The results confirmed the expectations of obtaining electrical ceramic insulators, with white burning clay of Santa Luzia and partial replacement up to 35.4% of feldspar, by treaty residue of conilon ash coffee husk burning. The statistic design that showed best results was for formulation with percentages of: clay 26.4 to 30.4%; kaolin 14.85 to 17.1%; feldspar 12.92 to 16.96%; R2 residue 7.08 to 9.2% and Quartz 32.5 to 38.75%, relative to the total mass of the mixture. The best results indicated; 0.2 to 1.4% apparent porosity , water absorption 0.1 to 0.7%, flexural strength 35 to 45MPa , dielectric strength 35-41 kV/cm , the transverse resistivity 8x109 2.5x1010 ?.cm and for the dielectric constant ?/?0 7 to 10.4, specification parameters for manufacturing ceramic electrical insulators of low and medium voltage.

Submitted by Automa??o e Estat?stica (sst@bczm.ufrn.br) on 2016-04-01T00:12:18Z No. of bitstreams: 1 RavennaMariaMonteiroBarros_DISSERT.pdf: 14068389 bytes, checksum: 8ee91e6f3ca8a944dc4350382caa62de (MD5) / Approved for entry into archive by Arlan Eloi Leite Silva (eloihistoriador@yahoo.com.br) on 2016-04-06T00:06:40Z (GMT) No. of bitstreams: 1 RavennaMariaMonteiroBarros_DISSERT.pdf: 14068389 bytes, checksum: 8ee91e6f3ca8a944dc4350382caa62de (MD5) / Made available in DSpace on 2016-04-06T00:06:40Z (GMT). No. of bitstreams: 1 RavennaMariaMonteiroBarros_DISSERT.pdf: 14068389 bytes, checksum: 8ee91e6f3ca8a944dc4350382caa62de (MD5) Previous issue date: 2015-04-20 / Durante suas opera??es, a ind?stria petrol?fera gera uma grande quantidade de res?duos, dentre eles, o cascalho de perfura??o. O controle dos impactos ambientais causados devido a esses res?duos representa um grande desafio. Tais impactos podem ser minimizados quando ? dado um gerenciamento adequado, sendo convenientemente tratados e corretamente dispostos ou quando reciclados. As propriedades dos materiais cer?micos podem ser fortemente influenciadas quando adicionado um res?duo ? sua composi??o. Este trabalho tem como objetivo estudar a incorpora??o do res?duo de cascalho de perfura??o de po?os de petr?leo na massa padr?o para fabrica??o de cer?mica vermelha proveniente de uma ind?stria cer?mica do munic?pio de S?o Gon?alo do Amarante/RN. O sucesso da incorpora??o pode minimizar custos na produ??o das pe?as cer?micas e diminuir os impactos ambientais gerados pelo res?duo. As mat?rias-primas utilizadas foram coletadas e caracterizadas, sendo formuladas com os percentuais de 0, 20 e 40% em substitui??o de massa por res?duo, foram sinterizadas nas temperaturas de 900, 1.010 e 1.120 ?C utilizando patamares de queima de 30min, 1h30min e 2h30min com base em um planejamento fatorial 2?. Em seguida amostras foram submetidas aos ensaios de Absor??o de ?gua, Retra??o Linear de Queima, Tens?o de Ruptura ? Flex?o, Porosidade Aparente, Massa Especifica Aparente e Microscopia Eletr?nica de Varredura (MEV) da se??o de ruptura. Os resultados mostraram que ? poss?vel a utiliza??o do res?duo para a fabrica??o de produtos da cer?mica vermelha (telhas, tijolos maci?os e tijolos furados) substituindo-se a argila em at? 40%, atendendo aos requisitos exigidos pela norma e pela literatura para as propriedades tecnol?gicas do produto final. / During its operations, the oil industry generates a lot of waste, including gravel from drilling. Control of environmental impacts caused by this waste represents a major challenge. Such impacts can be minimized when it is given an appropriate management by being properly treated and properly disposed or recycled. The properties of these materials can be greatly influenced when a waste is added to its composition. This work aims to study the incorporation of gravel waste oil-well drilling in the standard body for production of red ceramic from a ceramic industry in S?o Gon?alo do Amarante / RN. The success of the incorporation can minimize costs in the production of ceramic pieces and reduce the environmental impacts caused by waste. The raw materials used were collected, characterized, and formulated with the percentages of 0%, 20% and 40% by weight of substitution of residue were synthesized at temperatures of 900, 1.010 and 1.120 ?C using 30 minute firing intervals, 1 hour and 30min and 2 hours and 30 minutes, based on a factorial design 2?. Samples were then subjected to the tests of Water Absorption, Linear Retraction Firing, Flexural Rupture Strength, Apparent Porosity and Apparent Specific mass and Scanning Electron Microscopy (SEM) of break section. The results showed that the use of the residue for the manufacture of the ceramic products is possible (tiles, bricks and massive hollow bricks) replacing the clay to 40%, meeting the requirements of the standard and the literature for the technological properties of the final product.

Submitted by Automa??o e Estat?stica (sst@bczm.ufrn.br) on 2016-04-08T23:17:04Z No. of bitstreams: 1 MarcondesMendesDeSouza_TESE.pdf: 3135857 bytes, checksum: 11e52ad3f92073cb71b4e3869890ab67 (MD5) / Approved for entry into archive by Arlan Eloi Leite Silva (eloihistoriador@yahoo.com.br) on 2016-04-11T23:07:06Z (GMT) No. of bitstreams: 1 MarcondesMendesDeSouza_TESE.pdf: 3135857 bytes, checksum: 11e52ad3f92073cb71b4e3869890ab67 (MD5) / Made available in DSpace on 2016-04-11T23:07:06Z (GMT). No. of bitstreams: 1 MarcondesMendesDeSouza_TESE.pdf: 3135857 bytes, checksum: 11e52ad3f92073cb71b4e3869890ab67 (MD5) Previous issue date: 2015-04-17 / Nos estados da Para?ba e Rio Grande do Norte, no Brasil, as jazidas mais expressivas na produ??o de minerais industriais n?o-met?licos s?o as dos pegmatitos, quartzitos e granitos, que est?o localizadas na regi?o do Serid?. Os munic?pios de V?rzea - PB, Ouro Branco - RN e Parelhas - RN s?o os principais respons?veis pela extra??o de argila, quartzo, micas e feldspato. As empresas de minera??o que atuam na extra??o e beneficiamento dos quartzitos geram grandes volumes de res?duos, constituindo cerca de 90% de SiO2 na sua composi??o qu?mica proveniente do quartzo, que ? um dos constituintes b?sicos nas formula??es das massas cer?micas para a produ??o de revestimento cer?micos. Para tanto, este trabalho avalia o estudo da adi??o de res?duos de quartzito para obten??o do gr?s porcelanato atrav?s da caracteriza??o das mat?rias-primas por FRX, DRX, MEV, AG, ATG e DSC, utilizando cinco formula??es contendo 57% de feldspato, 37% de argila e 6% de res?duos de quartzitos com colora??es diferentes (branco, dourado, rosa, verde e preto), que foram sinterizadas em tr?s temperaturas: 1150?C, 1200?C e 1250?C, com isoterma de 1 hora e taxa de aquecimento de 10? C/min. Ap?s a sinteriza??o, os corpos-de-prova foram submetidos a ensaios de caracteriza??o f?sica como: absor??o de ?gua, retra??o linear, porosidade aparente, massa espec?fica aparente, resist?ncia ? flex?o em tr?s pontos. Os resultados obtidos apontavam para a possibilidade da utiliza??o do res?duo de quartzito em um percentual de 6% de adi??o na massa cer?mica. A utiliza??o de res?duos de quartzito em massa cer?mica proporcionou um produto final com propriedades tecnol?gicas que atendem ?s normas t?cnicas para a produ??o de gr?s porcelanato, sendo a temperatura de 1200?Ca que apresentou melhores resultados. De acordo com os resultados obtidos verificou-se um alto teor de ?xido de ferro no quartzito preto, sendo descartada a utiliza??o do mesmo em gr?s porcelanato por quest?o estrutural, pois o material fundiu a 1250?C. Todas as formula??es dos quartzitos obtiveram baixa absor??o de ?gua quando sinterizadas a 1200?C, obtendo AA entre 0,1% a 0,36% sem terem passado pelo processo de atomiza??o. Nos ensaios de resist?ncia ? flex?o todos os quartzitos encontram-se nos limites de aceita??o, segundo a norma europeia EN 100, superando 27 MPa na sinteriza??o a 1200?C. Com isso, o uso de res?duo de quartzito em massas cer?micas se apresenta como excelente potencial para a produ??o de gr?s porcelanato. / In States of Para?ba (PB) and Rio Grande do Norte (RN), northeast of Brazil, the most significant deposits of non-metallic industrial minerals are pegmatites, quartzites and granites, which are located in Serid? region. Extraction of clay, quartz, micas and feldspars occurs mainly in the cities of V?rzea (PB), OuroBranco (RN) and Parelhas (RN). Mining companies working in the extraction and processing of quartzite generate large volumes of waste containing about 90% SiO2 in their chemical composition coming from quartz that is one of the basic constituents of ceramic mass for the production of ceramic coating. Therefore, this work evaluates the utilization of these wastes on fabrication of high-quality ceramic products, such as porcelain stoneware, in industrial scale. Characterization of raw materials was based on XRF, XRD, GA, TGA and DSC analysis, on samples composed by 57% of feldspar, 37% of argil and 6% of quartzite residues, with 5 different colors (white, gold, pink, green and black). Samples were synthesized in three temperatures, 1150?C, 1200?C and 1250?C, with one hour isotherm and warming-up tax of 10?C/min. After synthesizing, the specimens were submit to physical characterization tests of water absorption, linear shrinkage, apparently porosity, density, flexural strain at three points. The addition of 6% of quartzite residue to ceramic mass provided a final product with technological properties attending technical norms for the production of porcelain stoneware; best results were observed at a temperature of 1200?C. According to the results there was a high iron oxide on black quartzite, being their use in porcelain stoneware discarded by ethic and structural question, because the material fused at 1250?C. All quartzite formulations had low water absorption when synthesized at 1200?C, getting 0.1% to 0.36% without having gone through the atomization process. Besides, flexural strain tests overcame 27 MPa reaching the acceptance limits of the European Directive EN 100, at 1200?C synthesizing. Thus, the use of quartzite residues in ceramic masses poses as great potential for the production of porcelain stoneware.