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Previous issue date: 2016-01-29 / Conselho Nacional de Desenvolvimento Cient?fico e Tecnol?gico (CNPq) / Atualmente, estima-se que a produ??o mundial de algod?o atinja uma marca superior a 26 milh?es de toneladas. Destas, cerca de 8% torna-se res?duo, o qual ? descartado de maneira inapropriada, resultando em problemas ambientais. Neste contexto, estudos visando o reaproveitamento destes res?duos, tornam-se vi?veis tanto no contexto ambiental, quanto no contexto econ?mico. Assim, o objetivo deste trabalho ? de avaliar a influ?ncia da adi??o de diferentes teores e tamanhos de res?duo de fibra de algod?o gerado a partir do processo de lixamento: res?duo cru e funcionalizado, como material de refor?o em matrizes de cimento CPP Classe Especial para po?os de petr?leo. A funcionaliza??o da fibra foi feita com o polieletr?lito poli dialil dimetil am?nio (PDDACl), atrav?s da imer??o desta em solu??o contendo 5% em massa de PDDACl com rela??o a massa do res?duo, a 70?C por 30 minutos. O material foi filtrado e secado em estufa. Foram realizados ensaios de TGA/DSC, FTIR, MEV e DRX para caracterizar a fibra crua e funcionalizada, al?m do emprego da t?cnica de colorimetria para aferir a efetiva funcionaliza??o da fibra. Avaliou-se tamb?m a resist?ncia da fibra ao meio alcalino simulando o pH da pasta de cimento. Testes de resist?ncia ? tra??o por compress?o diametral foram executados com o objetivo de avaliar a intera??o do res?duo com a matriz.Utilizou-se o ensaio de resist?ncia ? tra??o por compress?o diametral (TCD) para avaliar o efeito das fibras no comportamento mec?nico da matriz de cimento. Avaliou-se o tipo da fibra: crua ou funcionalizada; concentra??o: 0,5 e 1,0% e granulometria: grosso (retido em 14 mesh) e fino (passante em 28 mesh) em matrizes de cimento com 7 dias de cura. A caracteriza??o apontou que o res?duo ? constitu?do quase que exclusivamente por celulose, al?m de ser altamente resistente ao meio alcalino. An?lises colorim?tricas, ap?s tingimento e lavagem do res?duo, e Imagens SEM, demonstraram que o PDDACl aderiu-se de fato ? superf?cie do res?duo por adsor??o f?sica. Os resultados dos ensaios de TCD apontam que o ganho de resist?ncia ? proporcional a concentra??o de res?duo celul?sico utilizado. O res?duo de menor tamanho tamb?m apresentou melhores resultados. Para o res?duo funcionalizado, o teor de 0,5% resultou em perda das propriedades mec?nicas, em contrapartida, o uso de 1% do res?duo funcionalizado apresentou os melhores resultados. / Currently, is estimated that world?s cotton production reaches a top brand up to
26 million tons. Of these, about 8% becomes waste, which is disposed improperly,
resulting in environmental problems. In this context, studies aiming the reutilization of
this waste, become viable both in the environmental context as in economic context. So
the aim of this study is to evaluate the influence of the addition of different contents and
sizes of cotton fiber waste generated from the sanding process: raw and functionalized
waste, as reinforcement material in cement matrices CPP Special Class for oil wells.
The fiber functionalization was made with the polyelectrolyte poly diallyl dimethyl
ammonium (PDDACl) by imer??o the waste in a solution containing 5% of PDDACl by
mass of fiber, at 70 ?C, for 30 minutes. The material was filtered and dried in an oven.
TGA/DSC, FTIR, SEM and DRX analysis were performed to characterize the raw and
functionalized fiber. Colorimetry techinique was also employed for measuring the
effective functionalization of the fiber. Also, the waste's resistance to alkaline medium
was evaluated. The splitting tension test (TCD) was used to evaluate the effect of the
fiber on the mechanical behavior of the cement matrix.Fiber type: raw and
functionalized; concentration: 0,5 and 1% and particle size: large (retained in 14 mesh
sieve) and thin (through 28 mesh sieve) were evaluated in cement matrices with 7 days
of setting time. The characterization showed that the residue consists almost exclusively
of cellulose, as well as being highly resistant to alkaline environment. Colorimetric
analysis after dyeing and washing of the residue, and SEM images showed that the
PDDACl indeed adhered to the surface of the residue by physical adsorption. The
results of the TCD tests indicate that resistance increases is proportional to the
concentration of cellulosic waste used. The smaller residue also showed better results.
For the functionalized residue, content of 0.5% resulted in a reduction of the mechanical
properties, however, the use of 1% of functionalized residue showed the best results.
The functionalized cotton fiber waste originating from the sanding process shows great
potential for application in cement pastes for wells cementing, in view of the significant
increase in splitting tension strength, even with a low content of the waste.
| Identifer | oai:union.ndltd.org:IBICT/oai:repositorio.ufrn.br:123456789/21564 |
| Date | 29 January 2016 |
| Creators | Lima, Mailon Aguimar de |
| Contributors | 00957245408, http://lattes.cnpq.br/2357217530716519, Nobrega, Andreza Kelly Costa, 02293726436, http://lattes.cnpq.br/9418395015529669, Meireles, Petrucia Duarte da Silva, 05734954403, http://lattes.cnpq.br/3754162575592849, Pergher, Sibele Berenice Castella, 50942611004, http://lattes.cnpq.br/5249001430287414, Nascimento, Jos? Heriberto Oliveira do, Freitas, J?lio Cezar de Oliveira |
| Publisher | PROGRAMA DE P?S-GRADUA??O EM QU?MICA, UFRN, Brasil |
| Source Sets | IBICT Brazilian ETDs |
| Language | Portuguese |
| Detected Language | English |
| Type | info:eu-repo/semantics/publishedVersion, info:eu-repo/semantics/masterThesis |
| Source | reponame:Repositório Institucional da UFRN, instname:Universidade Federal do Rio Grande do Norte, instacron:UFRN |
| Rights | info:eu-repo/semantics/openAccess |
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