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2025 Vol.35, Issue 2 Preview Page

Original Article

Bleeding Characteristics of Cement Grouts under High-Temperature Conditions

고온조건에서 시멘트 그라우트 재료의 블리딩 특성

Jo-Hyun Weon1
,
Jong-Won Lee2
,
Tae-Min Oh3*
원 조현1
,
이 종원2
,
오 태민3*
1Graduate Student, Department of Civil and Environmental Engineering, Pusan National University
2Post-Doctoral Researcher, Research Institute of Industrial Technology, Pusan National University
3Associate Professor, Department of Civil and Environmental Engineering, Pusan National University
1부산대학교 사회환경시스템공학과 석사과정
2부산대학교 생산기술연구소 연수연구원
3부산대학교 사회환경시스템공학과 부교수
*Corresponding Author
30 April 2025. pp. 166-178
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Abstract

As surface space becomes increasingly limited, underground space development is being accelerated to address the demand for efficient land utilization. Excavation and construction for underground space often induce multiple microfractures in the rock mass, requiring rock grouting to ensure structural reinforcement and groundwater sealing. Cement grout is commonly used as the injection material for rock grouting; however, it is prone to bleeding over time due to its properties. Excessive bleeding can compromise grout integrity and the stability of surrounding rock formations, necessitating its consideration in grout mix design and implementation. In deep underground, geothermal heat and groundwater result in high-temperature conditions. Therefore, understanding grout bleeding characteristics under high-temperature conditions is critical for selecting suitable grout materials and optimizing mix designs for in-situ application. This study aims to analyze the bleeding characteristics of cement grout for rock grouting under high-temperature conditions. In this study, Portland cement and micro-cement were used as grout materials, and bleeding characteristics were analyzed with respect to cement type, water–cement ratio, elapsed time, and temperature.

Keywords
High-temperature
Grouting
Micro-cement
Portland cement
Bleeding

최근 지상공간의 포화로 인해 지하공간 개발이 활발히 진행되고 있다. 지하공간 개발을 위한 굴착 및 시공 과정에서 다수의 암반 미세절리가 발생하며 암반 그라우팅을 통한 미세절리의 보강 및 차수는 필수적이다. 암반 그라우팅을 위한 주입재료는 시멘트 그라우트가 일반적으로 사용되며 시멘트 재료는 주입 후 시간 경과에 따라 블리딩(bleeding)이 발생한다. 블리딩이 과도하게 발생하면 그라우팅 품질저하와 구조물 및 주변 암반의 안정성 저하로 이어질 수 있으므로 이를 고려한 그라우트 설계 및 적용이 필요하다. 대심도 터널 및 구조물 건설 시 고온의 지열과 지하수로 인해 고온환경이 조성된다. 따라서 고온 조건을 고려한 그라우트의 블리딩 특성을 파악하고 현장 조건에 적절한 주입재료, 배합비를 선정하는 것이 중요하다. 본 연구에서는 고온조건에서의 암반 그라우팅을 위한 시멘트 그라우트의 블리딩 특성을 분석하고자 하였다. 이를 위해 시멘트 재료로 포틀랜드 시멘트와 마이크로 시멘트를 사용하였으며 시멘트 재료, 물-시멘트 배합비, 시간, 온도에 따른 블리딩 특성을 분석하였다.

키워드
고온조건
그라우팅
마이크로 시멘트
포틀랜드 시멘트
블리딩
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Information
  • Publisher :Korean Society for Rock Mechanics and Rock Engineering
  • Publisher(Ko) :한국암반공학회
  • Journal Title :Tunnel and Underground Space
  • Journal Title(Ko) :터널과 지하공간
  • Volume : 35
  • No :2
  • Pages :166-178
  • Received Date : 2025-04-08
  • Revised Date : 2025-04-11
  • Accepted Date : 2025-04-14
  • DOI :https://doi.org/10.7474/TUS.2025.35.2.166
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