Effect of self-healing of cracks in chloride ion diffusion and corrosion of engineered cementitious composites
This study investigates the chloride penetration resistance and electrochemical behavior of self-healing engineered cementitious composites (ECC). The experimental program involved exposing cracked ECC samples to NaCl solution, while monitoring chloride penetration and self-healing using water-perme...
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| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Elsevier
2025-03-01
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| Series: | Journal of Materials Research and Technology |
| Subjects: | |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S2238785425000389 |
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| Summary: | This study investigates the chloride penetration resistance and electrochemical behavior of self-healing engineered cementitious composites (ECC). The experimental program involved exposing cracked ECC samples to NaCl solution, while monitoring chloride penetration and self-healing using water-permeability tests. Electrochemical measurements, including open circuit potential, linear polarization resistance, and electrochemical impedance spectroscopy, were used to evaluate reinforcement corrosion over a 91-day period. Results show that water-tightness does not guarantee protection against chloride ingress, as cracks with widths exceeding 0.15 mm allowed chloride penetration despite self-healing. Reinforcement depassivation occurred within 1–3 days of chloride exposure, but self-healing reduced the corrosion current back to pre-crack levels within 1–2 months, highlighting its role in delaying corrosion propagation. These findings emphasize the importance of crack width control in achieving effective self-healing and suggest that electrochemical impedance spectroscopy is a useful technique for monitoring the self-healing process in reinforced ECC structures. |
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| ISSN: | 2238-7854 |