Análise da manifestação patológica no processo de carbonatação no concreto: mapeamento do índice de carbonatação correlacionado com a localização construtiva

Abstract

In this research, the depth of the carbonation phenomenon in concrete in specimens exposed in different places was analyzed with a reference trace for all samples, as well as the performance together with compression test in cylindrical specimens to obtain the resistance acquired over the 28 days of used concrete. Analysis has as one of the objectives to observe the advance of the carbonation front in the concrete related to the exposure site in the initial 28 days, being able to classify the referring location and aggressiveness presented in the CO2 concentration and the interaction of the materials, for protection measures of steel by covering the hardware in reinforced concrete structures in different environments. The development used the technical standards of the Brazilian Association of Technical Standards with the help of CPC-18 (1998) from RILEM, for the characterization of materials, dosage, procedure for carrying out and executing tests and reading of carbonation depth. In which a sample of cylindrical specimens were deposited in reinforced concrete structures in urban environments, an environment close to the tide and a semi-urban environment with a degree of mild aggressiveness. The materials adopted were all usual in the São Luís-MA region to get closer to the real constructive reality. The results obtained are analyzed according to the depth of the carbonation front of the samples and correlated with the locations and time of exposure.