Time-dependent serviceability of corrosion-affected concrete structures

摘要

Practical experience and experimental observations suggest that corrosion-affected concrete structures deteriorate at different rates as measured by strength and serviceability, with the latter deteriorating faster. Corrosion-induced problems related to structural serviceability also incur substantial costs in their reinstatement. It is therefore imperative to have a thorough assessment for the serviceability of these structures and to predict accurately the time for the reinstatement. Th current paper presents an application of time-dependent reliability methods to serviceability assessment of corrosion-affected concrete structures. Two approaches are employed to quantify the probability of serviceability failure owing to corrosion-induced concrete cracking and to determine the time for the structure to be unserviceable and hence requiring reinstatement. It is found that Monte Carlo simulation can be used to estimate the probability of serviceability failure with reasonable accuracy. It is also found that corrosion-induced concrete cracking can be modelled as a stochastic process. The application presented herein can serve as a guide for structural engineers and asset managers in making decisions with regard to the serviceability of corrosion-affected concrete structures. Timely intervention has the potential to prolong the service life of the structures.