Estudo da autocicatrização do concreto
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Tipo
TCC
Data de publicação
2019-06
Periódico
Citações (Scopus)
Autores
Marques, Aline Messias
Ferreira, Jacqueline Marinelli
Soares, Jéssica Santana
Ramalho, Lucas de Faria
Oliveira, Victor Hugo
Ferreira, Jacqueline Marinelli
Soares, Jéssica Santana
Ramalho, Lucas de Faria
Oliveira, Victor Hugo
Orientador
Priszkulnik, Simão
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Resumo
A autocicatrização do concreto é a sua capacidade de fechar suas próprias fissuras, obtida através da potencialização da capacidade cicatrizante dos próprios componentes do concreto, ou pela adição de materiais que causam a autocicatrização. O concreto preparado com aditivo cristalizante e o concreto preparado com adição de bactéria específica (bioconcreto) são tipos de concretos autocicatrizantes abordados no presente estudo. O objetivo deste estudo é analisar o desempenho do concreto com aditivo cristalizante e do bioconcreto na recuperação de estruturas acometidas de fissuras. O desempenho mecânico foi analisado nos dois tipos de concreto, através de ensaios laboratoriais de resistência à compressão axial e resistência à tração na flexão. Os concretos foram estudados aos 28 dias de idade e uma parte da amostra foi submetida à fissuração, sofrendo uma porcentagem de seu carregamento máximo, enquanto a outra parte não foi submetida à fissuração. Amostras fissuradas foram ensaiadas aos 28+28 dias de idade e tanto amostras fissuradas como não fissuradas foram ensaiadas aos 28+56 dias de idade. Os resultados mostraram que as resistências dos concretos autocicatrizantes fissurados cresceram do período da fissuração até os 84 dias e alcançaram resultados maiores do que os concretos não fissurados e o concreto de referência. Devido aos resultados de ensaios mecânicos e imagens de microscopia, a ocorrência de autocicatrização foi confirmada.
Self-healing of concrete is its ability to close its own cracks, obtained by enhancing the healing capacity of concrete components themselves or by adding materials that cause self-healing. The concrete prepared with crystallizing additive and concrete prepared with the addition of specific bacteria (bioconcrete) are types of self-healing concretes approached in the proposed study. The objective of this study is to analyze the performance of the concrete with crystallizing additive and the bioconcrete in the recovery of structures affected by fissures. The mechanical performance was analyzed on both types of concrete, through laboratory tests of resistance to axial compression and tensile strength in flexion. The concretes were studied at 28 days of age, and then one part of the sample was submitted to cracking, suffering a percentage of its maximum load, while the other part was not submitted to cracking. Cracked samples were assayed at 28 + 28 days of age and both cracked and uncracked samples were assayed at 28 + 56 days of age. The results showed that the strengths of cracked self-crackers increased from the cracking period up to 84 days and achieved higher results than the non-cracked concrete and the reference concrete. Due to the results of mechanical tests and microscopy images, the occurrence of self-healing was confirmed.
Self-healing of concrete is its ability to close its own cracks, obtained by enhancing the healing capacity of concrete components themselves or by adding materials that cause self-healing. The concrete prepared with crystallizing additive and concrete prepared with the addition of specific bacteria (bioconcrete) are types of self-healing concretes approached in the proposed study. The objective of this study is to analyze the performance of the concrete with crystallizing additive and the bioconcrete in the recovery of structures affected by fissures. The mechanical performance was analyzed on both types of concrete, through laboratory tests of resistance to axial compression and tensile strength in flexion. The concretes were studied at 28 days of age, and then one part of the sample was submitted to cracking, suffering a percentage of its maximum load, while the other part was not submitted to cracking. Cracked samples were assayed at 28 + 28 days of age and both cracked and uncracked samples were assayed at 28 + 56 days of age. The results showed that the strengths of cracked self-crackers increased from the cracking period up to 84 days and achieved higher results than the non-cracked concrete and the reference concrete. Due to the results of mechanical tests and microscopy images, the occurrence of self-healing was confirmed.
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Palavras-chave
concreto , autocicatrização , concreto autocicatrizante , bioconcreto , cristalizante , fissuras , concrete , self-healing , self-healing concrete , bioconcrete , crystallizing , fissures