2013 Fiscal Year Final Research Report

Development of LiNO2 Injection Method Considering Macrocell Corrosion

Research Project

Project/Area Number	24656270
Research Category	Grant-in-Aid for Challenging Exploratory Research
Allocation Type	Single-year Grants
Research Field	Civil engineering materials/Construction/Construction management
Research Institution	Kyoto University
Principal Investigator	TOYOAKI MIYAGAWA 京都大学, 工学(系)研究科(研究院), 教授 (80093318)
Co-Investigator(Kenkyū-buntansha)	山本貴士京都大学 (70335199) 高谷哲京都大学 (40554209)
Project Period (FY)	2012-04-01 – 2014-03-31
Keywords	コンクリート / 亜硝酸イオン / 腐食抑制剤
Research Abstract	In this study,at first,corrosion preventing mechanism of nitrite ion was investigated. As a result, it was made clear that nitrite ion control anode reaction and consequently keep corrosion potential noble. The fact means there is possibility macrocell corrosion occur in case difference of nitrite ion concentration exist on the same steel bar. Then, influence of nitrite ion concentration on macrocell corrosion was also investigated. As a result, it was made clear risk of macrocell corrosion is little because concrete resistance is sufficiently high.

(4 results)