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CORROSION RESISTANCE OF CR-BEARING REBAR TO MACROCELL CORROSION CAUSED BY CONCRETE COVER CRACK

Title
CORROSION RESISTANCE OF CR-BEARING REBAR TO MACROCELL CORROSION CAUSED BY CONCRETE COVER CRACK
Author
신성우
Keywords
Cr-bearing rebar; corrosion resistance; crack; macrocell corrosion; carbonation; chloride attack
Issue Date
2006-07
Publisher
IRON STEEL INST JAPAN KEIDANREN KAIKAN
Citation
ISIJ INTERNATIONAL, v. 46, No. 7, Page. 1086-1092
Abstract
Artificial cracks were made in the cover concrete of specimens embedding ten types of steel rebars having different Cr contents with the aim of developing Cr-bearing steel rebars resistant to macrocell corrosion environments induced by cracking in cover concrete. The cracks were subjected to intensive penetration of carbon dioxide (carbonation specimens) and chloride ions (chloride attack specimens) to form macrocells. Both groups of specimens were then subjected to accelerated corrosion curing, during which the macrocell corrosion current density was measured. The corrosion area and corrosion loss were also measured at the end of 105 cycles of this accelerated curing. In a macrocell corrosion environment induced by localized carbonation, the minimum Cr content of rebars required for corrosion resistance was 7 %. Rebars with a Cr content of 11 % were proven corrosion-resistant in a chloride ion concentration macrocell with a concentration difference of not more than 3 kg/m(3).
URI
https://www.jstage.jst.go.jp/article/isijinternational/46/7/46_7_1086/_article/-char/ja/http://repository.hanyang.ac.kr/handle/20.500.11754/108320
ISSN
0915-1559; 1347-5460
DOI
10.2355/isijinternational.46.1086
Appears in Collections:
COLLEGE OF ENGINEERING SCIENCES[E](공학대학) > ARCHITECTURE(건축학부) > Articles
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