O impacto do procedimento de cura no desenvolvimento de resistência mecânica no concreto de cimento Portland
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Data
2023-06
Autores
Orientador
Mascolo, Rafael
Banca
Velho, Douglas Ferreira
Bernhard, Carolina
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Resumo
A cada dia a indústria da construção civil passa por mudanças expressivas, especialmente quando se trata de controles de qualidade nas obras. Em grande parte, isso é consequência da falta de preparo dos profissionais atuantes no setor, causando impactos negativos na qualidade do concreto utilizado nas edificações. Nesse contexto, técnicas como a cura surgem como solução para reverter essa situação. O objetivo principal desta monografia é analisar a influência do tempo de cura úmida, em concretos de baixo, médio e alto consumo de cimento. A partir de pesquisas bibliográficas que proporcionaram embasamento teórico ao procedimento de cura e aliado à caracterização dos materiais utilizados na produção do concreto, foi possível realizar ensaios práticos, onde corpos de prova foram submetidos a imersão em água saturada de cal por diferentes períodos. Estes ensaios, forneceram resultados que comprovam a existência de um desnível relevante, em que os exemplares submetidos à imersão apresentaram um desenvolvimento de resistência superior aos que apenas foram expostos ao ambiente. Isso indica que a cura por imersão em água saturada de cal, contribuiu para aumentar a resistência do concreto nos três traços, rico intermediário e pobre. Ainda é possível afirmar que, no traço pobre a técnica de cura estudada deve ser mantida necessariamente até o terceiro dia após a concretagem, enquanto para o traço intermediário o tempo mínimo é de um dia. Já no traço rico a cura nas idades iniciais não apresenta tanta influência no ganho de resistência, porém quando mantida por períodos mais longos apresenta um acréscimo significativo a esse parâmetro. Constata-se que, o traço rico quando comparado aos traços pobre e intermediário, obteve um menor aumento de resistência por influência do tipo de cura estudado. Da mesma, forma comprova-se que concretos com menor teor de cimento em seu traço, requerem um procedimento de cura apropriado para alcançarem níveis de resistência mais altos.
Every day the civil construction industry undergoes significant changes, especially when it comes to quality controls in works. In large part, this is a consequence of the lack of preparation of professionals working in the sector, causing negative impacts on the quality of the concrete used in buildings. In this context, techniques such as healing emerge as a solution to reverse this situation. The main objective of this monograph is to analyze the influence of wet curing time in low, medium and high cement consumption concrete. Based on bibliographic research that provided a theoretical basis for the curing procedure and combined with the characterization of the materials used in the production of concrete, it was possible to carry out practical tests, where specimens were immersed in water saturated with lime for different periods. These tests provided results that prove the existence of a relevant difference in level, in which the specimens submitted to immersion showed a higher resistance development than those that were only exposed to the environment. This indicates that curing by immersion in water saturated with lime contributed to increase the strength of concrete in the three traits, intermediate rich and poor. It is still possible to state that, in the poor trait, the studied healing technique must necessarily be maintained until the third day after completion, while for the intermediate trait, the minimum time is one day. As for the rich trait, curing in the initial stages does not have much influence on resistance gain, but when maintained for longer periods, it presents a significant increase in this parameter. It appears that the rich trait, when compared to the poor and intermediate traits, obtained a smaller increase in resistance due to the influence of the type of cure studied. Likewise, it has been proven that concretes with lower cement content in their mix require an adequate curing procedure to reach higher resistance levels.
Every day the civil construction industry undergoes significant changes, especially when it comes to quality controls in works. In large part, this is a consequence of the lack of preparation of professionals working in the sector, causing negative impacts on the quality of the concrete used in buildings. In this context, techniques such as healing emerge as a solution to reverse this situation. The main objective of this monograph is to analyze the influence of wet curing time in low, medium and high cement consumption concrete. Based on bibliographic research that provided a theoretical basis for the curing procedure and combined with the characterization of the materials used in the production of concrete, it was possible to carry out practical tests, where specimens were immersed in water saturated with lime for different periods. These tests provided results that prove the existence of a relevant difference in level, in which the specimens submitted to immersion showed a higher resistance development than those that were only exposed to the environment. This indicates that curing by immersion in water saturated with lime contributed to increase the strength of concrete in the three traits, intermediate rich and poor. It is still possible to state that, in the poor trait, the studied healing technique must necessarily be maintained until the third day after completion, while for the intermediate trait, the minimum time is one day. As for the rich trait, curing in the initial stages does not have much influence on resistance gain, but when maintained for longer periods, it presents a significant increase in this parameter. It appears that the rich trait, when compared to the poor and intermediate traits, obtained a smaller increase in resistance due to the influence of the type of cure studied. Likewise, it has been proven that concretes with lower cement content in their mix require an adequate curing procedure to reach higher resistance levels.
Descrição
Palavras-chave
cura úmida; procedimento de cura; concreto; wet curing; concrete; curing procedure
Citação
MICHELON, Eduardo. O IMPACTO DO PROCEDIMENTO DE CURA NO DESENVOLVIMENTO DE RESISTÊNCIA MECÂNICA NO CONCRETO DE CIMENTO PORTLAND. 2023. Monografia (Graduação em Engenharia Civil) – Universidade do Vale do Taquari - Univates, Lajeado, 28 jun. 2023. Disponível em: http://hdl.handle.net/10737/3852.