Corrosion Resistance of Cr-bearing Rebar in Concrete with Chloride Ion Content

• Published in: ISIJ International Vol. 46; no. 7; pp. 1075 - 1080
• Main Authors: Tae, Sung-Ho, Lee, Han-Seung, Noguchi, Takafumi, Ujiro, Takumi, Shin, Sung-Woo
• Format: Journal Article
• Language: English
• Published: Tokyo The Iron and Steel Institute of Japan 2006; Iron and Steel Institute of Japan
• Subjects: Applied sciences; average corrosion rate; chloride ion; Corrosion; corrosion area; Corrosion environments; corrosion resistance; Cr-bearing rebar; Exact sciences and technology; half-cell potential; Metals. Metallurgy; weight loss; corrosion area; Mass loss; weight loss; Corrosion rate; Potential; Reinforced concrete; Cr-bearing rebar; Concrete reinforcing bar; Corrosion resistance; average corrosion rate; chloride ion; Corrosion; Chlorides; half-cell potential; Application
• ISSN: 0915-1559; 1347-5460
• DOI: 10.2355/isijinternational.46.1075

As a fundamental study on the performance of Cr-bearing rebars in steel reinforced concrete structures exposed to corrosive environments, The test specimens were made by installing 8 types of rebars in concretes with a chloride ion content of 0.3, 0.6, 1.2, 2.4 and 24 kg/m3. Corrosion accelerated curing were then conducted with them. The corrosion resistance of Cr-bearing rebars was examined by measuring crack widths, half-cell potential, corrosion area and weight loss after 155 cycles of corrosion- accelerating curing. The results of the study showed that the corrosion resistance increased as the Cr content increased regardless of the content of chloride ions, and that the Cr-bearing rebars with a Cr content of 5% and 9% showed high corrosion resistance in concretes with a chloride ion content of 1.2 and 2.4 kg/m3, respectively.