Estudo da Carbonatação em Elementos Estruturais de Pontes de Concreto no Estado de Mato Grosso do Sul

Abstract

For a long time, durability projects of reinforced concrete structures were based on subjective criteria such as implicit rules and past experiences. The importance of evaluating the service life of a structure has gained space in the world scientific community due to economic and sustainability issues. There are several mechanisms of deterioration and aging of structures, for this reason it was noticed that the deterministic methods employed were unable to guarantee the durability of structures and new models began to be introduced. This work presents the application of service life prediction models, focusing on reinforced concrete bridges subject to carbonation and the comparison of the results obtained by each model in bridges built in different regions of the state of Mato Grosso do Sul. from the parameters defined in the design phase of projects, from reinforced concrete elements exposed to different environments and climatic conditions. Using four predictive models of service life and carbonation depth, it was possible to better understand the depassivation of reinforcements over the years, and to verify the risk of depassivation at more advanced ages. The results were compared to each other, checking the compatibility between models and the variability of the results of each model. The work consists of an initial prediction of the carbonation front, where the models used indicated that the bridge reinforcements would not have undergone depassivation at 50 years of age.