Identification of corrosion initiation condition of re-bar in existing hardened concrete by iron powder sprinkling method

2016 Fiscal Year Final Research Report

• Project/Area Number: 26420444
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Civil engineering materials/Construction/Construction management
• Research Institution: Kisarazu National College of Technology
• Principal Investigator: AOKI YUSUKE 木更津工業高等専門学校, 環境都市工学科, 准教授 (70360328)
• Research Collaborator: SUGAWARA Takashi ; TANAKA Yoshiki ; SHIMANO Keiji ; ANAI Keita ; TAKAHASHI Ryo ; MASUDA Yosuke ; YOKOO Tomoki
• Project Period (FY): 2014-04-01 – 2017-03-31
• Keywords: コンクリート / 塩害 / 診断 / 塩化物イオン / 鋼材腐食 / 鉄粉散布法

Outline of Final Research Achievements

Researcher has been studied the practicality of "iron powder sprinkling method" as a method of measuring the threshold value of the chloride ion concentration at the corrosion initiation of steel in the existing concrete. As a result, it turned out that there is a problem in the practicality of this method and its cause is due to difficulty in finding the corrosion of iron powder. Therefore, the researcher changed the method for finding the corrosion of iron powder to the method of detecting the destruction of the passivation film on the iron powder surface by iron ion detection reagent. This new method gives us reliable results in a short time. After this, researcher will verify the practicality of this new method.

Free Research Field

土木工学