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Research Article

Effects of Relative Humidity on Electromechanical Properties of Self-Sensing Rapid Repair Material

자가센싱 급속 보수재료의 전기역학적 특성에 대한 상대습도의 영향

Tae Uk Kim1
,
Dong Joo Kim2*
김 태욱1
,
김 동주2*
1Graduate Student, Department of Civil and Environmental Engineering, Sejong University, Seoul 05006, Korea
2Professor, Department of Civil and Environmental Engineering, Sejong University, Seoul 05006, Korea
1세종대학교 건설환경공학과 석박통합과정
2세종대학교 건설환경공학과 교수
*Corresponding Author
30 June 2025. pp. 26-35
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Abstract

In this study, the effect of relative humidity (RH) on the electromechanical properties of self-sensing rapid repair materials (SRMs) was investigated to develop a stress and damage monitoring system for repair area using SRMs. The electromechanical properties of SRMs were investigated at ages of 3, 7, and 24 hours under RH conditions of 40%, 60%, 80%, and 100%. Regardless of age and RH, the electrical resistance of SRMs decreased as the compressive stress increased due to the reduced distance between conductive fine steel slag aggregates (FSSAs) and pores within the matrix. The self-sensing capacity of SRMs improved as the age increased from 3 to 24 hours, attributed to the increase in partially conductive paths resulting from continued hydration. The increase in pore free water at higher RH enhanced ionic conduction and reduced contact resistance, improving the self-sensing capacity by facilitating more continuous conductive paths. However, when RH exceeded 80%, free water formed a stable conductive network that was less responsive to loading, reducing the sensing capability.Under 60% RH at 24 hours, the electrical resistance of SRMs decreased from 4.637 to 4.028 kΩ as the compressive stress increased from 0 to 31.75 MPa, showing the largest reduction of 13.13%.

Keywords
self-sensing concrete
rapid repair material
relative humidity
stress sensing
free water

본 연구에서는 자가센싱 급속 보수재료(self-sensing rapid repair materials, SRMs)를 사용한 균열 및 단면 보수 부위의 응력 및 손상 모니터링 기술을 개발하기 위해 SRMs의 전기역학적 특성에 대한 상대습도의 영향을 조사하였다. SRMs의 전기역학적 특성은 재령 3, 7, 24시간에서 상대습도 40%, 60%, 80%, 100% 조건에서 조사되었다. SRMs의 전기저항은 재령과 상대습도에 관계없이 압축응력이 증가함에 따라 매트릭스 내부에 혼입된 전도성 재료인 제강슬래그 잔골재(fine steel slag aggregates, FSSAs)와 공극들의 사이 거리가 감소함에 따라 감소하였다. SRMs의 자가센싱 능력은 재령이 3시간에서 24시간으로 증가함에 따라 수화반응의 지속으로 인한 부분적인 전도성 경로의 수 증가로 향상되었다. 상대습도의 증가로 인한 매트릭스 내 자유수 함량 증가는 이온전도성을 증가시키고 접촉저항을 감소시켜 자가센싱 능력을 향상시켰으나, 상대습도가 80% 이상으로 증가할 경우 과도한 자유수로 인해 전도성 네트워크가 연속적으로 고정되어 하중에 따른 동적 재구성이 제한되어 자가센싱 민감도가 저하되었다. 상대습도 60% 및 재령 24시간 기준 SRM의 전기저항은 압축응력이 0에서 31.75 MPa로 증가함에 따라 4.637에서 4.028 kΩ으로 13.13% 감소하여 가장 큰 전기저항 감소량을 보였다.

키워드
자기감지 콘크리트
급속 보수재료
상대습도
응력 감지
자유수
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Information
  • Publisher :Korean Institute of Bridge and Structural Engineers
  • Publisher(Ko) :한국교량및구조공학회
  • Journal Title :Journal of Structure Research and Practice
  • Journal Title(Ko) :한국교량및구조공학회 논문집
  • Volume : 3
  • No :1
  • Pages :26-35
  • Received Date : 2025-06-18
  • Revised Date : 2025-07-16
  • Accepted Date : 2025-07-16
  • DOI :https://doi.org/10.22725/JSRP.2025.3.1.26
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