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Abstract(s)
O âmbito desta dissertação centra-se na temática de estudos de durabilidade do betão auto-compactavel (BAC), cujo cálculo dos constituintes foi feito pelo método de Nepomuceno.
Sobre amostras de 40, 55 e 70 MPa, produzidas segundo o método atrás identificado, foram feitos estudos químicos e morfológicos, de propriedades de transporte de mecanismos de degradação e de propriedades indirectas.
Os três provetes em estudo de 40, 55 e 70 MPa, apresentam características satisfatórias a nível da microestrutura, propriedades de transporte, carbonatação, penetração de cloretos e análise de ultra-sons.
Numa análise comparativa entre as três resistências mecânicas em estudo, verifica-se que as propriedades de durabilidade vão melhorando a medida que a resistência mecânica também aumenta, ou seja, os provete com 70 MPa apresentam as melhores características a nível de durabilidade e os de 40 as piores; os de 55 apresentam propriedades intermédias.
The scope of this dissertation focuses on the studyof durability on self-compacting concrete (SSC), whose constituents have been calculated by Nepomuceno method. With samples of 40, 55 and 70 MPa produced by the mentioned above method were done some chemical and morphologic analysis, transport properties, degradation mechanisms and indirect studies, were done. The three samples in study indicate that all have satisfactory characteristics of morphologic microstructure, transport properties, carbonatation, chloride penetration and ultra-sonic pulse velocity. On a comparative basis between the three mechanicalresistances in study, it appears that the durability properties improve as the compressive strength of concrete also increases. Therefore the specimen of 70MPa shows the best characteristics in terms of durability performance and 40 the worst, consequently 55MPa shows intermediate properties.
The scope of this dissertation focuses on the studyof durability on self-compacting concrete (SSC), whose constituents have been calculated by Nepomuceno method. With samples of 40, 55 and 70 MPa produced by the mentioned above method were done some chemical and morphologic analysis, transport properties, degradation mechanisms and indirect studies, were done. The three samples in study indicate that all have satisfactory characteristics of morphologic microstructure, transport properties, carbonatation, chloride penetration and ultra-sonic pulse velocity. On a comparative basis between the three mechanicalresistances in study, it appears that the durability properties improve as the compressive strength of concrete also increases. Therefore the specimen of 70MPa shows the best characteristics in terms of durability performance and 40 the worst, consequently 55MPa shows intermediate properties.
Description
Keywords
Investigação Metodologia
Citation
Milho, Raquel Maria Bernardo Jorge - Introdução ao estudo de durabilidade do betão auto-compactável. Lisboa: Instituto Superior de Engenharia de Lisboa, 2011. Dissertação de mestrado.