Journal of Korean Tunnelling and Underground Space Association (한국터널지하공간학회 논문집)

Korean Tunnelling and Underground Space Association (한국터널지하공간학회)
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Electrical resistivity characteristics for cement specimens with TiO2 according to activated carbon content

활성탄 함유량에 따른 광촉매(TiO2) 시멘트 시편의 전기비저항 특성

  • Kong, Tae-Hyun (Dept. of Civil and Environmental Engineering, Pusan National University) ;
  • Lee, Jong-Won (Dept. of Civil and Environmental Engineering, Pusan National University) ;
  • Ye, Ji-Hun (Dept. of Civil and Environmental Engineering, Pusan National University) ;
  • Ahn, Jaehun (Dept. of Civil and Environmental Engineering, Pusan National University) ;
  • Oh, Tae-Min (Dept. of Civil and Environmental Engineering, Pusan National University)
  • 공태현 (부산대학교 사회환경시스템공학과) ;
  • 이종원 (부산대학교 사회환경시스템공학과) ;
  • 예지훈 (부산대학교 사회환경시스템공학과) ;
  • 안재훈 (부산대학교 사회환경시스템공학과) ;
  • 오태민 (부산대학교 사회환경시스템공학과)
  • Received : 2020.08.12
  • Accepted : 2020.08.25
  • Published : 2020.09.30

Abstract

Concrete with activated carbon and titanium dioxide (TiO2) has been used to reduce the particulate matter (PM) in underground structures (e.g., tunnels) due to the high performance of nitrogen oxides (NOx) abatement. Damage (e.g. crack, spalling, or detachment) can be caused by the environmental and ageing effects on the surface of the particulate matter reduction concrete, installed on the tunnel lining. Therefore, it is important to evaluate the existence of spalling on the concrete surface for maintaining performance of NOx reduction. In this study, a basic research was performed for feasibility of spalling evaluation using electrical resistivity characteristics. Given the test results, the electrical resistivity was decreased as the ratios of activated carbon (0~15%) and TiO2 (0~25%) were increased for specimens. Under a dry condition, electrical resistivity of cement specimens, mixed with activated carbon and TiO2, was decreased up to 2.3 times, compared with the normal cement specimen. In addition, under saturation conditions (degree of saturation: 85~98%), electrical resistivity of cement specimens with activated carbon, was decreased up to 3.5 times, compared with the normal cement specimen. Regardless of the condition (dry or saturated), the difference of electrical resistivity values shows the range of 2.3~2.8 times between the mixing specimen (with activated carbon (15%) and TiO2 (25%)) and the normal cement specimen. This study can help to provide basic knowledge for spalling evaluation using the electrical resistivity on the surface of the particulate matter reduction concrete in tunnels.

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