Study On Test Methods,model And Applicability Of Non-Uniform Electrochemistry Acceleration Corrosion For Reinforcement

An efficient accelerated corrosion test method is the foundation for experimental investigation of corrosion behaviors of reinforcing steel embedded in concrete.In order to produce reinforcement corrosion quickly in the laboratory,some methods have been used.Among these methods,the electrolytic methods(impressed current methods)are adopted widely in experimental investigation due to the short test duration.Under the support of the National Basic Research Program of PRC(Grant No.2015CB655103)and the National Natural Science Foundation(Grant Nos.51678529 and 51678497),This present study focuses on understanding the electrochemical mechanism of those electrolytic methods,towards controlling the experimental parameters to produce similar corrosion patterns as in natural corrosion.The main contents of this paper are as follows:(1)According to the electrochemical,the accelerated corrosion of reinforcement in electrolytic method was analyzed.The influencing factors for electrolytic methods were discussed.The governing equations for rust development were derived,a model for the rust development under electrolytic method was established(2)Typical electrolytic accelerated corrosion methods were defined.The finite element software was used to study rust distribution,corrosion efficiency and influencing factors of typical electrolytic methods.The feasibility of non-uniform electrolytic method was analyzed and the recommended parameters of this method were proposed.(3)The electrolytic accelerated corrosion in concrete was analyzed.The influence of aggregate position and aggregate shape on rust distribution was discussed,which is verified by experiments.The recommended parameters were proposed to reduce the randomness of the simulation.