Estudo comparativo entre métodos de dosagem de concreto autoadensável

• Ano de defesa: 2011
• Autor(a) principal: Fochs, Rafael Gómez
• Orientador(a): Silva, Isaac Newton Lima da
• Tipo de documento: Dissertação
• Tipo de acesso: Acesso aberto
• Idioma: por
• Instituição de defesa: Pontifícia Universidade Católica do Rio Grande do Sul; Porto Alegre
• Palavras-chave em Português: ENGENHARIA DE MATERIAIS; CONCRETO - DOSAGEM; ARGAMASSA - TRATAMENTO
• Link de acesso: http://hdl.handle.net/10923/3328

Self-compacting concrete (SCC) was first developed in Japan as an attempt to solve the problem of scarce skilled labor. Its introduction provided several opportunities for improved quality and productivity in the construction industry. Since then, researchers have developed research activities to understand and make the trial mix design of the self-compacting concrete as clear and systematic as the mix proportions of conventional concrete nowadays. In Brazil, trial mix design methods of SCC can be divided into two groups. The methods in the first group are based on the addition of aggregates, and the mix is evaluated from the paste formulation stage to the final adjustment of the concrete. The second group evaluates the concrete as a whole, and uses concepts of the IPT/EPUSP method proposed by Helene and Terzian (1992). In this research, a comparison was made among Tutikian and Dal Molin’s (2007), Alencar and Helene’s mix-proportioning methods of SCC - both of which belong to the second group - and a SCC obtained through a method developed in this work. All the SCC’s were mixed with fine sand, and for each method, a family with three base concrete compositions was mixed. The concepts of the CIENTEC and IPT/EPUSP methods proposed were used for obtaining the resulting self-compacting concrete. Besides, the dry mortar content and the superplasticizer additive content were considered in relation to the variable cement for each base concrete composition of a same family. The results of the trials conducted to test the fresh state workability, the compressive strength, the water absorption by immersion and capillarity in the hardened state, as well as the cost by the cubic meter of concrete, showed that the performance of the SCC developed in this work is equivalent or superior to the other methods.