Electric anticorrosion management method of the steel in the concrete structure which utilizes the evaluation method and the said evaluation method of supply speed of the dissolved oxygen to the steel surface in the concrete structure

摘要

P To provide a method for easily evaluating a supply speed of dissolved oxygen to be supplied to a steel material front surface in a concrete structure without being affected by IR and by an oxidation-reduction system formed ON the front surface of platinum, and also to provide an electric protection management method for a steel material in the concrete structure, which can set a required depolarization amount based ON the supply speed of the dissolved oxygen to the steel material front surface and which is evaluated by the evaluation method. PSOLUTION: There is provided a method for: arranging a platinum electrode ON a steel material front surface in a concrete structure; temporarily energizing the platinum electrode as a cathode so as to generate hydrogen gas from the front surface of the platinum electrode; measuring a potential attenuation curve of the platinum electrode after turning OFF the energization; obtaining a time from the turn-off of the energization to an inflection point of the secular change of the potential of the platinum electrode; and then, evaluating a supply speed of dissolved oxygen to the steel material front surface in the concrete structure and based ON the time. There is also provided an electric protection management method for the steel material in the concrete structure using the evaluation method. PCOPYRIGHT: (C)2012 and JPO& INPIT