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Determination of microbial corrosion is very important to anticipate the remaining service life of the concrete structures in order to avoid the recurrence of structures collapse or failures. The behaviors of Fe-ions and formation of Fe-rich layer were studied. Fe-ions started to migrate to carbonated zone during carbonation process. When surface pH decreased by microbial corrosion process, Fe-ions accumulated and concentrated locally forming Fe-layer at areas between corroded and sound zones. Results show that Fe-layer depth is more than the depth of corrosion. Calculation of Fe-layer formation rates as a mean to determine the corrosion rate with certain factor of safety is proposed.  コンクリートの微生物腐食を表す指標として, 腐食部分の先端に見られるFe層の存在理由とその意義を室内実験と現場調査により明示する. ICPでのFeイオンの分析から, 炭酸化と微生物腐食によるpHの低下によって, 腐食先端にFeイオンが集積することがわかった. この挙動は現場調査結果からも確かめられた. さらに腐食深さとFe層の位置には比例関係が見られた. 微生物腐食速度の決定にFe層の追跡が有効と考えられる

SIGNIFICANCE OF IRON LAYER AS AN INDICATOR TO DETERMINE THE MICROBIAL CORROSION OF CONCRETES