Proteção de estruturas de concreto armado em reservatórios enterrados para detenção de cheias em sistemas de macrodrenagem : avaliação de tecnologias aplicáveis ao reservatório Vilarinho 2 em Belo Horizonte

Abstract

With the new engineering solutions of drainage in large urban centers, it is necessary to be concerned with the performance and durability of these structures. At the same time, the market has been updating in terms of supply and availability of materials and technologies for this purpose. In this context, a very useful benefit is the reduction of concrete permeability. Thus, this work aims to evaluate existing studies that proposed to present results of experiments with the use of microsilica or waterproofing agents by crystallization incorporated into concrete and as a surface treatment that are feasible for application in the structure of the underground reservoir for flood detention Vilarinho 2 The results obtained in the evaluated studies, for the most part, point to the reduction of the permeability of the concrete regarding the use of waterproofing agents by crystallization, however, some authors do not confirm this statement. Microsilica compared to waterproofing additives by crystallization indicate superior results regarding the reduction in permeability, in addition to also showing improvements in compressive strength. This compressive strength for the case of experiments using waterproofing agents by crystallization showed a significant reduction with the increase in the amount of incorporated material. Another point that was often cited by the authors is in relation to the water/cement factor adopted in the concrete mix, a ratio less than or equal to 0.45 could even present a more efficient reduction in permeability than waterproofing additives by crystallization. Finally, there was a discrepancy in the results obtained, which suggests the continuity of the studies, including the inclusion of new references that allow a greater wealth of data for a statistical treatment that points out the most frequent results and that can be considered in the conclusion. of the theme.