Peeling/Flacking Prediction Model

Occurrence of peeling/flacking (P/F) of concrete is a typical deterioration phenomenon in a concrete structure. From the point of view of structural safety and third party damage, it is necessary to evaluate the risk of P/F accurately and to cope with P/F. In this study, authors propose the methodology to predict on P/F of concrete in consideration of uncertainty. Concretely, a Weibull hazard model is formulated to express a corrosion of reinforcement with progress of time and an increase of the number of P/F, and is extended to a spatial Weibull hazard model by considering a spatial chain. By doing so, the proposed model expresses a partial increase of the number of P/F caused by a corrosion of reinforcement. Finally, the appropriateness of the proposed method is discussed through the empirical analysis of the visual inspection data on RC handrails in the railway bridge.