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Previous issue date: 2014-05-30 / Researches have shown that the introduction of rubber in concrete improves the features of
its deformability, as well as contributes to environmental disposal of waste generated in the
tire retreading process. Furthermore, there is a high availability of limestone within RN and
CE country. Ignorance about this stone, does not allow its wide use as aggregate, leaving,
this abundant supply idle. A composite of limestone gravel, with proportions of tire rubber
waste which could be used as concrete would be an alternative to concrete for low
applications. Therefore, this research aims to evaluate the characteristics of concrete
containing limestone gravel and proportions of little aggregate replacement (sand) by tire
rubber waste. To this goal, the material components of the concrete were characterized,
concrete specimens with limestone gravel were made, from the dash 1.0: 2.5: 3.5, varying
the water/cement ratio, and inserting a commercial plasticizer, without a proportion of
residue, known as reference. From this, concrete with and without the presence of the
additive in the same proportions were chosen, as well as these with the use of granite gravel,
for being the most used. Selected the references, to these, replacements of little aggregate
(sand) were added replaced by rubber waste from the tire retreading process, treated with
1M NaOH in proportions from 5.0 to 20.0 % by mass, cured and exposed to the semiarid
environment. The results indicate the possibility of using limestone gravel in the concrete
composition with workability correction using plasticizer. There was a decrease in the
mechanical properties of the concrete with increments of waste rubber, but there is an
improvement in toughness and deformability of the composite, which makes it interesting for
the construction of non-structural concrete floors, as well as, the rubber waste delayed the
hardening process, continuing to gain resistance after 28 days / Pesquisas t?m mostrado que a introdu??o de borracha no concreto melhoram as
caracter?sticas de deformabilidade deste, assim como, contribuem para destina??o
ambiental de res?duos gerados no processo de recauchutagem de pneus. Somado a isto,
existe uma alta disponibilidade de rocha calc?ria no interior do RN e do CE. O n?o
conhecimento desta pedra, n?o possibilita sua ampla utiliza??o como agregado, deixando,
esta farta oferta ociosa. Um comp?sito de brita do tipo calc?ria, com propor??es de res?duo
de borracha de pneu que pudesse ser utilizado como concreto seria uma alternativa para
concretos destinados a baixas solicita??es. Logo, este trabalho possui como objetivo a
avalia??o das carater?sticas de concretos contendo brita calc?ria e propor??es de
substitui??o do agregado mi?do (areia) por res?duo de borracha de pneus. Para tanto,
caracterizou-se os materiais componentes do concreto, confeccionou-se corpos de prova de
concretos com brita calc?ria, a partir do tra?o 1,0: 2,5: 3,5, variando-se a rela??o
?gua/cimento, e inserindo-se um plastificante comercial, sem a propor??o de res?duo,
chamados de refer?ncia. A partir deste, foram escolhidos nas mesmas propor??es concretos
com e sem a presen?a do aditivo, assim como, estes com a utiliza??o da brita gran?tica, por
ser a mais utilizada. Escolhidas as refer?ncias, a estas foram acrescidas substitui??es de
parte do agregado mi?do (areia) por res?duo de borracha de pneu proveniente do processo
de recauchutagem, tratados com NaOH 1 M, nas propor??es de 5,0 a 20,0 % em massa,
curados e expostos ao ambiente semi?rido. Os resultados indicam a possibilidade de
utiliza??o da brita calc?ria na composi??o do concreto com corre??o da trabalhabilidade
utilizando-se plastificante. Observou-se uma diminui??o nas propriedades mec?nicas dos
concretos com incrementos de res?duo de borracha, por?m existe uma melhora de
tenacidade, e deformabilidade do comp?sito, o que o torna interessante para a constru??o
de pisos de concretos n?o estruturais, assim como, o res?duo retardou o processo de
endurecimento, continuando o concreto a ganhar resist?ncia, ap?s os 28 dias
| Identifer | oai:union.ndltd.org:IBICT/oai:repositorio.ufrn.br:123456789/12867 |
| Date | 30 May 2014 |
| Creators | Silva Junior, Francisco Alves da |
| Contributors | CPF:15724520800, http://lattes.cnpq.br/0022988322449627, Paskocimas, Carlos Alberto, CPF:06296687877, http://lattes.cnpq.br/2365059843175411, Anjos, Marcos Alyssandro Soares dos, CPF:02262184496, http://lattes.cnpq.br/3904325866154130, Santos, Maria Luiza Lopes de Oliveira, CPF:87658968404, http://lattes.cnpq.br/7052771233872451, Delmonte, Mauricio Roberto Bomio, CPF:27816279841, http://lattes.cnpq.br/9558299312183852, Martinelli, Ant?nio Eduardo |
| 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/doctoralThesis |
| 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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