Estimation of the industrial building reinforced concrete beams’ residual life under corrosive media influence

Abstract

The dominant factor determining chemical industry objects’ durability is the corrosive wear of the stretched reinforcement and the compressed zone of concrete. The article presents a methodology and results of a numerical assessment of the residual life of the reinforced concrete frame beams of an industrial building operating in an aggressive environment. According to the full-scale engineering survey results, the most damaged frame structures - the beams of the intermediate floors were identified. The period of concrete protective layer complete neutralization, the degree of corrosion damage to the working reinforcement, the compressed concrete neutralized layer depth, the change in its strength characteristics with depth and the degree of its heterogeneity were determined by the field measurements using the standard and non-standard methods of non-destructive testing. A linear law of the accumulation of corrosion damage to concrete in the compressed zone and the rate of corrosion damage in the working reinforcement after the concrete protective properties’ exhaustion is adopted. A normative design apparatus is used for the first group of limiting states in relation to the most loaded section. For an adequate assessment and prediction of the residual resource, the main emphasis is on experimental and diagnostic methods.