Aplicação dos métodos AHP e TOPSIS no estudo da durabilidade do concreto auto-adensável com adição de metacaulim e cinza de casca de arroz

Abstract

Self-compacting concrete (CAA) has been used in large scale, mainly in the last decades, owing to its mechanical and even economic properties. In addition to this growth, there is the environmental concern, which has motivated studies with the reuse of materials, as well as the use of elements less aggressive to the environment. Among them is the metakaolin mineral addition and the rice husk ash, which is a industrial residue, materials used in the composition of the concrete in focus in this work. For the manufacture of a more durable concrete with less environmental impact, many mixture proportionions are tested and several other tests are carried out. As a result, this work brings the application of decision-making tools, the Analytic Hierarchy Process (AHP) and the Technique for Order Preference by Similarity to Ideal Solution (TOPSIS), in order to perform a systemic interpretation to obtain the best decision regarding the alternatives presented in a study dedicated to the properties of durability of the CAA. Through the application of the AHP and the TOPSIS, it was verified that the mixture with 10% metakaolin and 10% of rice husk ash had a better performance as regards the durability properties of the studied concrete. Also, with the application of this tools, the results of the tests can be analyzed in a more objective and global manner, contributing to the verification of the efficacy of the use of metakaolin and rice hull ash in CAA, because its performance was better than the blend without these additions.