Corrosion Assessment of Coupled Steel Reinforcement with Ni-Ti–Based Shape Memory Alloy in Simulated-Concrete Pore Solution
L. A. Alarab, B. Ross, Amir Poursaee
Aug 1, 2016
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Journal
Journal of Materials in Civil Engineering
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Key Takeaway Key Takeaway: Coupled steel reinforcement with Ni-Ti-based shape memory alloy significantly increases corrosion activity in simulated concrete pore solution compared to steel alone.
Abstract
AbstractThough the mechanical properties of shape-memory alloys (SMAs) make them a promising material for reinforcement in concrete structures, their electrochemical behavior in concrete environments has not previously been studied. This study investigated the influence of galvanic coupling between a nickel-titanium (Ni-Ti)–based SMA and a low-carbon steel on their corrosion performance in simulated concrete pore solution. Three measurement cells were considered: SMA alone, low-carbon steel alone, and one with the coupled SMA and carbon steel. The specimens were immersed in the chloride-free pore solution for 20 days and then 3% by weight of NaCl was added to the solution. The specimens were then kept in the chloride-contaminated solution for 70 days. The corrosion resistances of the specimens were assessed by different electrochemical measurement techniques. The results of the electrochemical experiments showed a significant increase in corrosion activity of the coupled specimens compared with that for o...