CORROSION DETECTING END OF STEEL PRODUCTS IN CONCRETE AND METHOD FOR EVALUATING CORROSION OF STEEL PRODUCTS USING SAID END

摘要

PURPOSE:To evaluate the corrosion of steel products in concrete by providing a cap consisting of a water permeable material to the aperture of a detecting end vessel, providing a reference electrode, counter electrode and current wire control electrode into said cap and measuring the potential on the concrete surface. CONSTITUTION:The cap 26 consisting of the water permeable material is provided to the aperture 25 of the vessel 6 of a portable corrosion detecting end 24 and an electrolyte 3 is filled therein. The reference electrode 4, the counter electrode 5 and the current wire control electrode 11 are inserted into the cap 26. The counter electrode 5 and the current wire control electrode 11 are constituted flush with each other. The corrosion is macroscopically evaluated by electrically conducting the steel product 8 in the concrete 7 to the electrolyte 3, moving the corrosion detecting end 24 along the steel products 8 while bringing said end into tight contact successively with the surface of the concrete 7 and measuring the natural potential. Polarization is measured by using the counter electrode 5, an ammeter 14, and a potentiostat 27 and the AC impedance is measured by using a frequency response analyzer 28 by which the corrosion condition is precisely evaluated. The corrosion of the steel products in the actual concrete structure is, therefore, non-destructively evaluated and the easy on-site execution of the evaluation is permitted.