DAP Supramolecular Hydrogel Driven Self-Healing Cement-Based Materials

Abstract

Abstract: In order to prolong the service life of concrete, a 2,6-bis [N-(carboxyethyl carbonyl) amino] pyridine (DAP) supramolecular hydrogel driven self-healing cement-based material and hydroxyapatite self-healing technology were developed. In alkaline environment, the DAP supramolecular hydrogel loaded with NH₄H₂PO₄ can realize the releasing of repair agent intelligently. DAP supramolecular hydrogel loaded with repair agent was encapsulated in a hollow glass tube and used to prepare self-healing component, and experiments of healing crack and rebar protection were carried out. The results show that the crack surface with a width of 0.592 mm is repaired after 28 d of healing. The healing product is hydroxyapatite. The self-healing component delays the rebar corrosion. The repair agent is released at the cracks and the generated healing products fill the cracks, thus blocking the intrusion channels of hazardous ions and gas.

Key words: cement, crack, self-healing, hydroxyapatite, supramolecular hydrogel, rebar corrosion

CLC Number:

TQ172

CHEN Wei, LI Yue, LIU Xiang, TANG Yanjie, TANG Pei. DAP Supramolecular Hydrogel Driven Self-Healing Cement-Based Materials[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2022, 41(5): 1502-1509.

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