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2020 Vol.30, Issue 4 Preview Page

Research Article

Development of Water-resistant Grout according to Blast Furnace Slag Fine Powder and Calcium Hydroxide Content

고로슬래그 미분말과 수산화칼슘 함유량에 따른 차수그라우트재 개발

Hyeok Seo1
,
Kyungho Park2
,
Sugeun Jeong3
,
Daehyeon Kim4*
서 혁1
,
박 경호2
,
정 수근3
,
김 대현4*
1Graduated Student, Department of Civil Engineering, Chosun University
2Assistant Professor, Department of Civil Construction Engineering, Chosun College of Science and Technology
3Undergraduated Student, Department of Civil Engineering, Chosun University
4Professor, Department of Civil Engineering, Chosun University
1조선대학교 토목공학과 박사과정
2조선이공대학교 토목건설과 조교수
3조선대학교 토목공학과 학사과정
4조선대학교 토목공학과 교수
*Corresponding Author
31 December 2020. pp. 541-555
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Abstract

The grouting method is used for reinforcing and waterproofing the soft ground, increasing the bearing capacity of structures damaged by lowering or subsidence due to rise and vibration, and for ordering. This study attempted to develop a blast furnace slag-based cementless grout material to increase the strength and hardening time of the grout material using reinforcing fibers. In this regard, in this study, it was used in combination with calcium hydroxide, which is an alkali stimulant of the three fine powders of blast furnace slag, and the content of calcium hydroxide was used by substituting 10, 20, and 30% of the fine powder of blast furnace slag. In addition, in order to compare the strength according to the presence or absence of reinforcing fibers, an experiment was performed by adding 0.5% of each fiber. As the content of carbon fibers and aramid fibers increased, the uniaxial compressive strength increased, and it was confirmed that the crosslinking action of the fibers in the grout material increased the uniaxial compressive strength. In addition, it was confirmed that the gel time sharply decreased as the content of the alkali stimulate increased.

Keywords
blast furance slag
aramid fiber
carbon fiber
uniaxial compressive strength
permeability test

그라우팅 공법은 연약지반의 보강과 방수 및 지하수위저하 또는 상승과 진동으로 인한 침하 및 부등침하로 손상된 구조물의 지지력을 높이고 차수를 높이는 목적으로 사용된다. 본 연구는 보강섬유를 이용하여 그라우트재료의 강도와 경화시간을 증대시키기 위하여 고로슬래그 기반의 무시멘트 그라우트재를 개발하고자 하였다. 이와 관련하여 본 연구에서는 고로슬래그 3종 미분말의 알칼리 자극제인 수산화칼슘과 배합하여 사용하였고 수산화칼슘의 함유량은 고로슬래그 미분말 대비 10, 20, 30% 까지 치환하여 사용하였다. 또한 보강섬유 유무에 따른 강도를 비교하기 위하여 각 섬유를 0.5%씩 추가하여 실험을 수행하였다. 탄소섬유 및 아라미드 섬유 함유량이 증가함에 따라 일축압축강도가 증가하였고, 이는 그라우트재 내에 섬유에 의한 가교작용이 일축압축강도를 증가시키는 경향을 확인하였다. 또한 알칼리자극제의 함유량이 증가할수록 겔타임이 급격하게 감소하는 것을 확인하였다.

키워드
고로슬래그 미분말
아라미드섬유
탄소섬유
일축압축강도
투수시험
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Information
  • Publisher :Korean Society of Engineering Geology
  • Publisher(Ko) :대한지질공학회
  • Journal Title :The Journal of Engineering Geology
  • Journal Title(Ko) :지질공학
  • Volume : 30
  • No :4
  • Pages :541-555
  • Received Date : 2020-11-09
  • Revised Date : 2020-12-15
  • Accepted Date : 2020-12-16
  • DOI :https://doi.org/10.9720/kseg.2020.4.541
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