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Previous issue date: 2011-07-01 / The corrosive phenomenon on reinforced concrete structures is one of the
most founded pathologies on the coastal area. With the objective to prevent the
process development, or even, retard its beginning, it was studied the application of
inorganic covering over concrete surfaces, after its cure, as well as, evaluate the
efficiency of the covering applied on the concrete in reducing its porosity of concrete
preventing the entrance of aggressive agents to preserve the integrity of the existing
armor inside it, comparing the result obtained with the body-of-proof reference, that
didn?t receive covering protection. On the concrete production it was used Portland
Cement CP II 32, coarse aggregate, fine aggregate and water from the local
distributive. Two types of covering were used, one resin based of silicon and solvent
and other white cement based, selected sands and acrylic resin. The concrete
mixture adopted was 1:1,5:2,5 (cement, fine aggregate, coarse aggregate) and 0.50
water/cement ratio. With the concrete on fresh state was made the experiment test
to determinate the workability. On the hardened state was made the concrete
resistance experiment, absorption of water and electrochemical experiments,
through polarization curves. Also was held optical microscopy and Scanning Electron
Microscopy experiments to analyze the layer of the covering applied to the concrete
surface and the interface between the concrete and the layer. The obtained results
shows that the covering applied to the concrete surface didn?t affect the resistance
towards compression. On the absorption of water occurred a diminution of the
percentage absorbed, improving the concrete development by making it more
impermeable towards the entrance of aggressive agents. The electrochemical
experiment results confirmed the water absorption results; the body-of-proof covered
presented larger protection towards the development of corrosives process and
retarded the evolution of the corrosive phenomenon / O fen?meno de corros?o em estruturas de concreto armado ? uma das
patologias mais encontradas em ?reas litor?neas. Com o objetivo de impedir que o
processo se desenvolva ou mesmo retardar o seu in?cio, estudou-se a aplica??o de
revestimentos inorg?nicos sobre a superf?cie do concreto, ap?s sua cura, bem como,
foi avaliado a efici?ncia dos revestimentos aplicados a superf?cie do concreto em
reduzir a sua porosidade, impedindo a entrada dos agentes agressivos para
preservar a integridade da armadura existente no seu interior, comparando o
resultado obtido com corpos-de-prova refer?ncia, que n?o receberam nenhum
revestimento de prote??o. Na produ??o do concreto utilizou-se o Cimento Portland
CP II F 32, agregado gra?do, agregado mi?do e ?gua da concession?ria local.
Como revestimentos foram utilizados dois tipos, um ? base de resina de silicone e
solvente e o outro, ? base de cimento branco, areias selecionadas e resina acr?lica.
O tra?o adotado para o estudo foi 1:1,5:2,5 (cimento, areia e brita) e rela??o a/c =
0,50. Com o concreto no estado fresco, realizou-se o ensaio de abatimento de
tronco de cone para determina??o da trabalhabilidade. J? no estado endurecido,
realizou-se o ensaio de resist?ncia ? compress?o, absor??o de ?gua e os ensaios
eletroqu?micos, atrav?s de curvas de polariza??o. Tamb?m foram realizados ensaios
de Microscopia ?ptica e Microscopia Eletr?nica de Varredura para an?lise da
camada de revestimento aplicada ? superf?cie do concreto e a interface entre o
concreto e a camada. Os resultados obtidos mostram que os revestimentos
aplicados ? superf?cie do concreto n?o afetaram a resist?ncia ? compress?o. J? em
rela??o ? absor??o de ?gua houve uma diminui??o do percentual absorvido,
melhorando o desempenho do concreto por torn?-lo mais imperme?vel ? entrada
dos agentes agressivos. Os resultados dos ensaios eletroqu?micos confirmaram o
resultado do ensaio de absor??o de ?gua; os CP?s revestidos apresentaram uma
maior prote??o ao desenvolvimento de processos corrosivos e retardaram a
evolu??o do fen?meno de corros?o
| Identifer | oai:union.ndltd.org:IBICT/oai:repositorio.ufrn.br:123456789/12718 |
| Date | 01 July 2011 |
| Creators | Nunes, Pollyanna Tha?s Tavares Batista |
| Contributors | CPF:05012180410, http://lattes.cnpq.br/9858094266525225, Huitle, Carlos Alberto Martinez, CPF:01139059980, http://lattes.cnpq.br/2485073932883264, Barreto, Alexandro Di?genes, CPF:79059050444, http://lattes.cnpq.br/7824794714646180, Silva, Djalma Ribeiro da, Gomes, Uilame Umbelino |
| Publisher | Universidade Federal do Rio Grande do Norte, Programa de P?s-Gradua??o em Ci?ncia e Engenharia de Materiais, UFRN, BR, Processamento de Materiais a partir do P?; Pol?meros e Comp?sitos; Processamento de Materiais a part |
| Source Sets | IBICT Brazilian ETDs |
| Language | Portuguese |
| Detected Language | English |
| Type | info:eu-repo/semantics/publishedVersion, info:eu-repo/semantics/masterThesis |
| Format | application/pdf |
| 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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