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Corrosion Features of the Reinforcing Bar in Concrete with Intelligent OH Regulation of Microcapsules

School of Civil Engineering, Shenzhen University, Shenzhen 518060, China
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Materials 2019, 12(23), 3966; https://doi.org/10.3390/ma12233966
Received: 12 September 2019 / Revised: 5 November 2019 / Accepted: 19 November 2019 / Published: 29 November 2019
(This article belongs to the Special Issue Self-Healing and Smart Cementitious Construction Materials)
Corrosion is a challenging problem for marine concrete infrastructure projects. In this study, an intelligent OH-regulated microcapsule is designed to prevent reinforcement corrosion, taking ethylcellulose (EC) as shell material and calcium oxide (CaO) as core material. X-ray computed tomography (XCT) is used to trace and contrast the corrosion profiles of the concrete reinforcement bar with and without the microcapsule. The results show that the OH-regulated microcapsule exhibits effective corrosion protection by delaying corrosion initiation and cracking. An SEM study revealed that the microcapsule could be broken as Cl invades the concrete. However, intelligent OH regulation was realized by releasing CaO. View Full-Text
Keywords: reinforcement; concrete; corrosion; microcapsule; X-ray computed tomography (XCT) reinforcement; concrete; corrosion; microcapsule; X-ray computed tomography (XCT)
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Hong, S.; Qin, S.; Dong, B.; Xing, F. Corrosion Features of the Reinforcing Bar in Concrete with Intelligent OH Regulation of Microcapsules. Materials 2019, 12, 3966.

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