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Volume 14
Issue 19
10.3390/ma14195517
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Article

pH-Triggered Release Performance of Microcapsule-Based Inhibitor and Its Inhibition Effect on the Reinforcement Embedded in Mortar

by
Jinzhen Huang
1,2,†,
Yangyang Zhu
1,3,†,
Yuwei Ma
4,
Jie Hu
1,*,
Haoliang Huang
1,*,
Jiangxiong Wei
1,* and
Qijun Yu
1
1
School of Materials Science and Engineering, South China University of Technology, Guangzhou 510640, China
2
Southern Marine Science and Engineering Guangdong Laboratory (Zhanjiang), Zhanjiang 524006, China
3
China Vanke Co., Ltd., Shenzhen 518020, China
4
Research Center for Wind Engineering and Engineering Vibration, Guangzhou University, Guangzhou 510006, China
*
Authors to whom correspondence should be addressed.
†
Equal contribution to this work.
Materials 2021, 14(19), 5517; https://doi.org/10.3390/ma14195517
Submission received: 29 August 2021 / Revised: 16 September 2021 / Accepted: 20 September 2021 / Published: 23 September 2021
(This article belongs to the Special Issue Effects of Concrete Degradation on Gas Transfer Properties)
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Abstract

The smart release of healing agents is a key factor determining the inhibition efficiency of microcapsules-based corrosion inhibitors for reinforced concrete. In this study, the release behavior of benzotriazole (BTA) in microcapsule-based inhibitors was investigated in mortar sample to clarify the influence of different hydration products on the release process. The results indicated that under high pH environment (pH > 12.4), only about 5% reserved BTA was released from the mortar sample. pH drop resulted in the increased release of BTA from mortar sample. Most BTA in the microcapsule-based inhibitors was released from mortar sample in low pH environment, which was closely related to morphology/composition alterations of hydration products caused by pH drop of the environment. The smart release of BTA dramatically delayed corrosion initiation of reinforced mortar and halted corrosion product accumulation on the steel surface. Therefore, the corrosion resistance of the reinforced mortar was improved after corrosion initiation.
Keywords: microcapsule-based inhibitors; composition alterations; release behavior; mortar; pH sensitive; corrosion resistance microcapsule-based inhibitors; composition alterations; release behavior; mortar; pH sensitive; corrosion resistance

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MDPI and ACS Style

Huang, J.; Zhu, Y.; Ma, Y.; Hu, J.; Huang, H.; Wei, J.; Yu, Q. pH-Triggered Release Performance of Microcapsule-Based Inhibitor and Its Inhibition Effect on the Reinforcement Embedded in Mortar. Materials 2021, 14, 5517. https://doi.org/10.3390/ma14195517

AMA Style

Huang J, Zhu Y, Ma Y, Hu J, Huang H, Wei J, Yu Q. pH-Triggered Release Performance of Microcapsule-Based Inhibitor and Its Inhibition Effect on the Reinforcement Embedded in Mortar. Materials. 2021; 14(19):5517. https://doi.org/10.3390/ma14195517

Chicago/Turabian Style

Huang, Jinzhen, Yangyang Zhu, Yuwei Ma, Jie Hu, Haoliang Huang, Jiangxiong Wei, and Qijun Yu. 2021. "pH-Triggered Release Performance of Microcapsule-Based Inhibitor and Its Inhibition Effect on the Reinforcement Embedded in Mortar" Materials 14, no. 19: 5517. https://doi.org/10.3390/ma14195517

APA Style

Huang, J., Zhu, Y., Ma, Y., Hu, J., Huang, H., Wei, J., & Yu, Q. (2021). pH-Triggered Release Performance of Microcapsule-Based Inhibitor and Its Inhibition Effect on the Reinforcement Embedded in Mortar. Materials, 14(19), 5517. https://doi.org/10.3390/ma14195517

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