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

Korean Tunnelling and Underground Space Association (한국터널지하공간학회)
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A preliminary study of watertightness and salt water resistance of spray-applied membrane

뿜어붙임멤브레인의 방수성능 및 염수저항성의 기초평가

  • Choi, Soon-Wook (Geotechnical Engineering Research Institute, Korea Institute of Civil Engineering and Building Technology) ;
  • Kang, Tae-Ho (Geotechnical Engineering Research Institute, Korea Institute of Civil Engineering and Building Technology) ;
  • Chang, Soo-Ho (Geotechnical Engineering Research Institute, Korea Institute of Civil Engineering and Building Technology) ;
  • Lee, Cheol-Ho (Geotechnical Engineering Research Institute, Korea Institute of Civil Engineering and Building Technology) ;
  • Kim, Jintae (SILKROAD T&D) ;
  • Choi, Myung-Sik (SILKROAD T&D)
  • 최순욱 (한국건설기술연구원 지반연구소) ;
  • 강태호 (한국건설기술연구원 지반연구소) ;
  • 장수호 (한국건설기술연구원 지반연구소) ;
  • 이철호 (한국건설기술연구원 지반연구소) ;
  • 김진태 (실크로드티앤디 연구개발팀) ;
  • 최명식 (실크로드티앤디)
  • Received : 2017.03.17
  • Accepted : 2017.03.29
  • Published : 2017.03.31
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Abstract

The leakage of tunnel causes the long-term durability of the structures such as concrete lining to deteriorate. The cause of durability degradation can be various substances contained in groundwater such as chloride, sulphate, water, and gas. In this study, a series of test were carried out to determine the watertightness performance and the resistance to salt water of the spray-applied membrane used as non-structural rock support or as a waterproof material for tunnels. As a result, it was found that the penetration of water could occur in a specimen, and the reason was that the internal pores generated by the mixing of the liquid polymer and the powder material and the internal pores were connected by the water pressure. The tensile strength of the test specimens immersed in distilled water and saline water was found to be reduced to less than half of the tensile strength in normal condition. In addition, The elongation was measured to be higher in distilled water than in salt water. However, this result will require further investigation.

터널의 누수는 콘크리트 라이닝과 같은 구조물의 장기 내구성을 저하시키는 원인이 된다. 내구성 저하 원인은 염화물, 황산염, 물, 가스 등 지하수에 포함되어 있는 여러 가지 물질이 될 수 있다. 본 연구에서는 터널의 지보재로서 또는 방수재로서 사용되는 뿜어붙임멤브레인의 방수성능과 염수에 대한 저항성을 파악하기 위한 기초 시험을 수행하였다. 그 결과, 일부 시험체에서 물의 침투가 발생할 수 있는 것을 파악하였고 그 원인이 액상폴리머와 분말재료의 혼합에 의해 생기는 내부공극과 수압에 의해 내부공극이 연결되어 발생하는 것임을 알 수 있었다. 그리고 증류수와 염수에 침지된 시험체에 대한 인장강도시험을 통해서 인장강도가 기건상태에 비해 절반 이하로 감소될 수 있음을 확인하였다. 또한 신장률은 염수보다 증류수에서 신장률이 더 커지는 결과가 나타났다. 그러나 이 결과는 추가적인 조사가 필요할 것으로 판단된다.

Keywords

References

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