Raimu SAINO
Study on the judgment of wetting time in weather proof steel
Eiji Iwasaki
ĦĦThe thing of the continuation time in the wet condition is called wetting time. Now, the wet condition is evaluated by ACM sensor in many cases. However, the ACM sensor evaluates wet condition by corrosion of the sensor itself. Moreover, since there is a life by corrosion in the ACM sensor, it is necessary to exchange the ACM sensor periodically in the measurement in a long period of time. On the other hand, the method is proposed that how to measure the wet condition of corrosion steel materials by direct-current electrical resistance. However, since the electrical resistance value is chan ged by the method of installation, it is difficult to evaluate by the threshold of an electrical resistance value.
So this research measures direct-current electrical resistance for a real bridge, and performs measurement by the ACM sensor and a temperature-and-relative-humidity meter, and aims at the thing to depend on the threshold of direct-current electrical resistance, which are depended on direct-current electrical resistance while getting wet and examining the validity of a judgment and for which it gets wet and examines the judging standard of a state.
ĦĦThe wet condition measured not by corrosion current but by direct-current electrical resistance. I established installing a resistance measuring instrument, Tester and an ACM sensor, and a temperature-and-relative-humidity meter at steel bridge. As a result, it turned out that resistance is change d the whole resistance measuring instrument. Therefore, I considered that the judgment of wet condition by the threshold of resistance is difficult.
Next, I judged the amount of change of the electrical resistance value as a threshold instead of the threshold of the electrical resistance value for the judgment of the wet condition. From there, it turned out that the amount of change of an electrical resistance value may be able to judge the we t condition.
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