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Previous issue date: 2013-03-15 / The need to build durable structures and resistant to harsh environments enabled the
development of high strength concrete, these activities generate a high cement consumption,
which implies factor in CO2 emissions. Often the desired strength is not achieved using only
the cement composition. This study aims to evaluate the influence of pozzolans with the
addition of metakaolin on the physical mechanics of high strength concrete comparing them
with the standard formulation. Assays were performed to characterize the aggregates according
to NBR 7211, evaluation of cement and coarse aggregate through the trials of petrography
(NBR 15577-3/08) and alkali-aggregate reaction (NBR 15577-05/08). Specimens were
fabricated according to NBR 5738-1/04 with additions of 0%, 4%, 6%, 8% and 10% of
metakaolin for cement mortars CP V in the formulations. For evaluation of the concrete
hardened in fresh state and scattering assays were performed and compressive strength in
accordance with the NBR 7223/1992 and NBR 5739-8/94 respectively. The results of the
characterization of aggregates showed good characteristics regarding size analysis and
petrography, as well as potentially innocuous as the alkali-aggregate reaction. As to the test of
resistance to compression, all the formulations with the addition of metakaolin showed higher
value at 28 days of disruption compared with the standard formulation. These results present an
alternative to reduce CO2 emissions, and improvements in the quality and durability of
concrete, because the fine particle size of metakaolin provides an optimal compression of the
mass directly influencing the strength and rheology of the dough / A necessidade de construir estruturas dur?veis e resistentes a ambientes agressivos
proporcionou o desenvolvimento do concreto de alta resist?ncia, tais atividades geram um alto
consumo de cimento, fator que implica na emiss?o CO2. Muitas vezes a resist?ncia desejada
n?o ? atingida utilizando apenas o cimento na composi??o. Este trabalho tem como objetivo
avaliar a influ?ncia das pozolanas com a adi??o de metacaulim nas caracter?sticas f?sico
mec?nicas do concreto de alta resist?ncia comparando-as com a formula??o padr?o. Foram
realizados ensaios de caracteriza??o dos agregados de acordo com a norma NBR 7211,
avalia??o do cimento e agregado gra?do atrav?s dos ensaios de petrografia (NBR 15577 - 3/08)
e rea??o alcali-agregado (NBR 15577-05/08). Foram confeccionados corpos de prova de
acordo com a norma NBR 5738-1/04 com adi??es de 0%, 4%, 6%, 8% e 10% de metacaulim
em substitui??o ao cimento CP V nas formula??es. Para avalia??o do concreto no estado fresco
e endurecido foram realizados ensaios de espalhamento e resist?ncia ? compress?o de acordo
com as normas NBR 7223/1992 e NBR 5739-8/94 respectivamente. Os resultados da
caracteriza??o dos agregados apresentaram boas caracter?sticas quanto ? an?lise granulom?trica
e petrografia, bem como potencialmente in?cuos quanto ? rea??o alcali-agregado. Quanto ao
ensaio de resist?ncia ? compress?o, todas as formula??es com adi??o de metacaulim
apresentaram valor superior aos 28 dias de ruptura quando comparadas com a formula??o
padr?o. Estes resultados apresentam uma alternativa de redu??o da emiss?o de CO2, al?m de
melhorias na qualidade e durabilidade do concreto, pois a fina granulometria do metacaulim
proporciona uma ?tima compacta??o da massa influenciando diretamente na resist?ncia
mec?nica e reologia da massa
| Identifer | oai:union.ndltd.org:IBICT/oai:repositorio.ufrn.br:123456789/15709 |
| Date | 15 March 2013 |
| Creators | Soares, Faisy Paulino Pereira |
| Contributors | CPF:80732810400, http://lattes.cnpq.br/8671649752936793, Souza, Luiz Guilherme Meira de, CPF:25094955420, http://lattes.cnpq.br/0801747108308706, Silva, Celina Leal Mendes da, CPF:18992706200, http://lattes.cnpq.br/0940685473373951, Souza J?nior, Caubi Ferreira, CPF:40378632434, http://lattes.cnpq.br/5346630547885521, Nascimento, Rubens Maribondo do |
| Publisher | Universidade Federal do Rio Grande do Norte, Programa de P?s-Gradua??o em Engenharia Mec?nica, UFRN, BR, Tecnologia de Materiais; Projetos Mec?nicos; Termoci?ncias |
| 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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