Corrosion Resistance of Cr-bearing Rebar to Macrocell Corrosion Caused by Concrete Cover Crack

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 intensi...

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Veröffentlicht in:ISIJ International 2006, Vol.46(7), pp.1086-1092
Hauptverfasser: Tae, Sung-Ho, Lee, Han-Seung, Noguchi, Takafumi, Ujiro, Takumi, Shin, Sung-Woo
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container_issue 7
container_start_page 1086
container_title ISIJ International
container_volume 46
creator Tae, Sung-Ho
Lee, Han-Seung
Noguchi, Takafumi
Ujiro, Takumi
Shin, Sung-Woo
description 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/m3.
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subjects Applied sciences
carbonation
chloride attack
Corrosion
Corrosion environments
corrosion resistance
Cr-bearing rebar
crack
Exact sciences and technology
macrocell corrosion
Metals. Metallurgy
title Corrosion Resistance of Cr-bearing Rebar to Macrocell Corrosion Caused by Concrete Cover Crack
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