APPLICATION OF A FULL PROBABILISTIC MODEL FOR PREDICTING THE ADVANCE OF CARBONATION FRONT IN CONCRETE STRUCTURES.
Enson Portela1; Tulio Bittencourt1; André Beck2
1 University of São Paulo - USP; 2 EESC
doi:10.20906/CPS/CILAMCE2015-0273
Resumo
The high elevation of CO2 in our atmosphere can generate deeper carbonated layers in concrete structures and of course, this fact has a direct impact on the lifetime of RC structures, mainly reducing the durability and consequently the performance of this structure. For the past 70 years, carbonation has been studied and a large literature on this subject exists. In general, those works agree that the most important variables influencing concrete carbonation are relative humidity, CO2 concentration, curing of concrete and water cement relation. This paper presents an alternative methodology to predict the advance of carbonation front inside concrete structures. The model used in this work is a variation of the model adopted by the Model Code in 2010. Historical data from both local environment and concrete structures are incorporated to this model in order to perform a reliability analysis of concrete carbonation. This methodology is applied to some bridges in Brazil and results are shown.
Palavras-chave: Carbonation; Reliability Analysis; Concrete Structures