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ZJUS-A
Journal of Zhejiang University-SCIENCE A (Applied Physics & Engineering)  2010, Vol. 11 Issue (5): 382-388    DOI: 10.1631/jzus.A0900443
Environmental and Chemical Engineering     
Corrosion behavior of steel rebar in coal gangue-based mortars
Ji-xiu Zhang, Heng-hu Sun, Yin-ming Sun, Na Zhang
Department of Materials Science and Engineering, Tsinghua University, Beijing 100084, China
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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.

Key words： ord: Steel rebar      Corrosion      Coal gangue      Electrochemical     
Received: 22 July 2009      Published: 27 April 2010
CLC:  TD98  
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Ji-xiu Zhang
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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. Journal of Zhejiang University-SCIENCE A (Applied Physics & Engineering), 2010, 11(5): 382-388.

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http://www.zjujournals.com/xueshu/zjus-a/10.1631/jzus.A0900443     OR     http://www.zjujournals.com/xueshu/zjus-a/Y2010/V11/I5/382

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