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Previous issue date: 2016-05-05 / Conselho Nacional de Desenvolvimento Cient?fico e Tecnol?gico (CNPq) / Esta pesquisa foi pautada no projeto e constru??o de uma c?mara de carbonata??o acelerada, em quatro etapas distintas, capaz de equipar um laborat?rio destinado a estudar a durabilidade das edifica??es, principalmente no tocante ?s pesquisas relacionadas ?s an?lises de materiais ciment?cios. A primeira etapa foi determinada no projeto propriamente dito, onde se pensou em dimens?es e materiais a ser utilizado. A segunda etapa destinou-se a constru??o da c?mara de carbonata??o e finalizou com o teste de estanqueidade com o intuito de garantir sua veda??o. A pesquisa teve continuidade em sua terceira etapa, com a automa??o e microcontrole da c?mara de carbonata??o atrav?s de um algoritmo desenvolvido e programado, capaz de interagir com a programa??o presente nos sensores e v?lvulas adquiridos comercialmente. Esta etapa, ainda contou com a calibra??o do sensor, utilizando padr?es rastre?veis internacionalmente e a realiza??o de pr?-testes em modelo reduzido, antes da instala??o definitiva na c?mara de carbonata??o. A quarta etapa foi submeter ao ensaio de carbonata??o acelerada, amostras cil?ndricas de concreto com dimens?es de 100mm x 200mm, no interior da c?mara de carbonata??o acelerada, conforme os padr?es da Laborat?rio Nacional de Engenharia Civil - LNEC E-391 (1993) e especifica??o FINAL DRAFT FprCEN/TS 12390-12, da European Committee Standardization de novembro de 2010. As amostras foram submetidas ao ensaio de carbonata??o acelerada aos 7, 14, 28, 42 e 56 dias de exposi??o e obtiveram respectivamente, profundidades m?dias de carbonata??o de 0,00mm, 1,62mm, 2,65mm, 3,35mm e 3,72mm. Por fim, a pesquisa cumpriu seus objetivos em projetar e construir uma c?mara de carbonata??o acelerada em laborat?rio, bem como teve sua efici?ncia avaliada atrav?s da calibra??o de seus dispositivos avaliadores de CO2 e sua estanqueidade, e garantiu sua funcionalidade atrav?s do ensaio de carbonata??o acelerada em um concreto convencional com 365kg/m? de cimento. / The carbon dioxide present in the atmosphere penetrates into the porous matrix of concrete internally and dissolves altering the chemical balance of the means. Due to this CO2 dissociation occurs a gradual lowering of the pH, which likely contributes to corrosion of the reinforcement. This research was based on the design and construction of chamber accelerated carbonation, automatically, in four steps, able to equip a laboratory for studying the durability of buildings, especially as regards research related to analysis of cementitious materials. The first step was the realization of the project itself, which is defined dimensions and materials to be used. The second step is intended construction of the carbonation chamber and submitted to the tightness test in order to ensure its sealing. The research continued in its third stage, with automation and microcontroller carbonation chamber through an algorithm developed and programmed, able to interact with the programming present on the sensors and valves commercially available. This stage also included the sensor calibration using internationally traceable standards and conducting pre-tests in reduced model before final installation in the carbonation chamber. The fourth step was to submit the test of accelerated carbonation, cylindrical samples of concrete with dimensions of 100mm x 200mm, inside the accelerated carbonation chamber, according to the standards of the National Laboratory of Civil Engineering - LNEC E-391 (1993) and specification FINAL DRAFT FprCEN / TS 12390-12, the European Committee of Standardization November 2010. The samples were subjected to accelerated carbonation test at 7, 14, 28, 42 and 56 days of exposure and obtained respectively mean depths carbonation 0,00mm, 1,62mm, 2.65mm, 3,35mm and 3,72mm. Finally, the study met its goals with project execution and construction of accelerated carbonation chamber in the laboratory and had their assessed efficiency through calibration of its evaluators devices CO2 and its tightness, and secured its functionality by test accelerated carbonation in a conventional concrete with 365kg / m? cement CP V ARI and factor a / c 0.50.
| Identifer | oai:union.ndltd.org:IBICT/oai:repositorio.ufrn.br:123456789/21336 |
| Date | 05 May 2016 |
| Creators | Lucena, Cleber Medeiros de |
| Contributors | 02262184496, http://lattes.cnpq.br/3904325866154130, Silva Filho, Jos? Neres da, 83729950606, http://lattes.cnpq.br/0915972389480304, Barbosa, Normando Perazzo, 08548749415, http://lattes.cnpq.br/6420367558476872, Almeida, Maria das Vitorias Vieira, Anjos, Marcos Alyssandro Soares dos |
| Publisher | Universidade Federal do Rio Grande do Norte, PROGRAMA DE P?S-GRADUA??O EM ENGENHARIA CIVIL, 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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