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Visualization of Self-Healing Function of Protective Coating for Concrete

콘크리트 보호코팅재의 자기치유 기능의 시각화

  • Received : 2019.08.28
  • Accepted : 2019.10.20
  • Published : 2019.10.28

Abstract

Microcapsules were prepared by using a mixture of linseed oil and a small amount of fluorescent fluid as a core material. Self-healing protective coatings were prepared by applying coating formulations containing varying amounts of microcapsules on mortar surface. After scratch or crack was generated in the coating, when the damaged region was exposed to ultraviolet light (${\lambda}=365nm$), it was observed that fluorescence emission area increased with increasing microcapsule loading. In the cases of the self-healing coatings having 20wt% or more microcapsule loading, the damaged region was almost filled with the healing agent. In water sorptivity test, the self-healing coating having 20wt% or more microcapsule loading showed a healing efficiency of about 85%. The fluorescence emission from the damaged region was easily observed at a distance of 3 m. The self-healing protective coating is expected to be useful to confirm its self-healing function with the eye.

Acknowledgement

Supported by : Ministry of Land, Infrastructure and Transport of Korean government

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