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A Study on Expansion and Strength Characteristics of Material for Emergency Restoration in Ground Cavity

지반공동 긴급복구 재료의 팽창 및 강도특성에 관한 연구

Jin-Gyu Han1
,
Yong-Sun Ryu2
,
Dongwook Kim3
,
Jeong-Jun Park4
,
Gigwon Hong5*
한 진규1
,
유 용선2
,
김 동욱3
,
박 정준4
,
홍 기권5*
1Nonmember, General manager, Chemius Korea Co., Ltd
2Member, President, Chemius Korea Co., Ltd.
3Member, Assistant Professor, Department of Civil and Environmental Engineering Incheon National University
4Member, Principal Researcher, Incheon Disaster Prevention Research Center, Incheon Natl. Univ
5Member, Director, Institute of Technology Research and Development, Korea Engineering & Construction
*교신저자. *Corresponding Author. 
30 June 2017. pp. 131-138
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Abstract

In this study, the expansion and compressive strength tests of emergency restoration material were carried out to restore cavity causing ground subsidence. The expansion and compressive strength characteristics according to component ratio of main material - hardener and mix proportion of blowing agent - accelerator were analyzed based on the test results. As a result of the relationship of curing time - expansion ratio analyses, it confirmed that expansion ratio decreased with reduced curing time regardless of mix proportion of blowing agent - accelerator in main material, if component ratio of hardener increased. This means that component ratio of the main material - hardener had greatly affected the expansion ratio. The compressive strength characteristics of emergency restoration material confirmed that strength was affected by mix proportion of blowing agent – accelerator. Therefore, it is necessary to apply reasonable component ratio and mix proportion to consider the required injection time, expansion ratio and strength of restoration material, when emergency restoration in ground cavity is required.

Keywords
Ground cavity
Emergency restoration
Expansion material
Compressive strength

본 연구에서는 지반함몰을 유발하는 지반 내 공동 긴급복구 재료에 대한 팽창 및 일축압축강도 실험을 수행하였으며, 실험결과 를 바탕으로 주제-경화제 구성비와 주제 내 발포제-촉진제 배합비에 따른 팽창 및 강도특성을 분석하였다. 먼저, 경화시간-팽창 률 관계를 분석한 결과, 주제에 포함된 발포제와 촉진제 배합조건에 상관없이, 경화제의 비율이 높으면, 경화시간을 단축하면 서 팽창률을 감소시키는 것으로 평가되었다. 이는 주제-경화제 구성비가 팽창률에 큰 영향을 미치는 것을 의미한다. 팽창재료 의 강도특성을 분석한 결과, 발포제와 촉진제 배합비가 팽창재료 강도에 큰 영향을 미치는 것으로 확인되었다. 따라서 긴급복 구가 요구되는 경우, 공동의 크기 및 형태 등에 따라 팽창재료의 소요 주입시간, 팽창률 및 요구강도를 고려한 주제-경화제 구성비, 주제 내 발포제-촉진제 배합비의 적용이 필요함을 확인하였다.

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Information
  • Publisher :Korean Geosythetics Society
  • Publisher(Ko) :한국지반신소재학회
  • Journal Title :Journal of the Korean Geosynthetics Society
  • Journal Title(Ko) :한국지반신소재학회 논문집
  • Volume : 16
  • No :2
  • Pages :131-138
  • Received Date : 2017-06-02
  • Revised Date : 2017-06-06
  • Accepted Date : 2017-06-21
  • DOI :https://doi.org/10.12814/jkgss.2017.16.2.131
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