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CLC number: TD98

On-line Access: 2010-04-27

Received: 2009-07-22

Revision Accepted: 2009-11-16

Crosschecked: 2010-03-30

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Journal of Zhejiang University SCIENCE A 2010 Vol.11 No.5 P.382-388

http://doi.org/10.1631/jzus.A0900443


Corrosion behavior of steel rebar in coal gangue-based mortars


Author(s):  Ji-xiu Zhang, Heng-hu Sun, Yin-ming Sun, Na Zhang

Affiliation(s):  Department of Materials Science and Engineering, Tsinghua University, Beijing 100084, China

Corresponding email(s):   zhangjixiu06@mails.tsinghua.edu.cn

Key Words:  ord: Steel rebar, Corrosion, Coal gangue, Electrochemical


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Ji-xiu Zhang, Heng-hu Sun, Yin-ming Sun, Na Zhang. Corrosion behavior of steel rebar in coal gangue-based mortars[J]. Journal of Zhejiang University Science A, 2010, 11(5): 382-388.

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%A Yin-ming Sun
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T1 - Corrosion behavior of steel rebar in coal gangue-based mortars
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SP - 382
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PB - Zhejiang University Press & Springer
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DOI - 10.1631/jzus.A0900443


Abstract: 
corrosion of steel rebar is the most important durability problem of reinforced concrete. The aim of this research was to investigate the corrosion behavior of steel rebar in simulated pore solutions and gangue-blended cement mortar. The simulated pore solutions were based on the pore solution composition of gangue-blended cement. The pH and Cl concentration of simulated pore solutions had significant effects on corrosion potential. However, an increase in pH reduced the influence of Cl concentration on corrosion potential. The corrosion behavior of steel rebar in gangue-blended cement is different from that in simulated solutions. The gangue cementitious mortar surrounding steel rebar provides stable passivity environments for steel, leading to a decrease in ion diffusion coefficients. Alternating current impedance (ACI) analysis results indicated that the indicator Rc for concrete resistivity is higher for gangue mortar than for ordinary Portland cement (OPC), which improves its corrosion potential. The results from energy dispersive X-ray analysis (EDX) showed more aluminates and silicates at the rebar interface for gangue-blended cement. These aluminates improve the chloride binding capacity of hydrates in mortar, and increase the corrosion protection of steel rebar.

Darkslateblue:Affiliate; Royal Blue:Author; Turquoise:Article

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