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2025 Vol.41, Issue 5
Effect of PVA on Increasing Strength of Steel-Slag-Treated Clay and Applicability to Port and Harbor Improvement

PVA를 혼합한 제강슬래그의 강도증가 경향 및 항만개선에 대한 적용성 조사

Odate Yuya1
,
Hata Toshiro2
,
Won-jin Beak3*
,
Chiwoon Jang4
,
Jihoon Jeong5
,
Yunha Joo6
오다테 유야1
,
하타 토시로2
,
백 원진3*
,
장 치운4
,
정 지훈5
,
주 윤하6
1MSc Student, Dept. of Civil and Environmental Engineering, Hiroshima Univ., Japan
2Prof., Dept. of Civil and Environmental Engineering, Hiroshima Univ., Japan
3Member, Prof., Dept. of Rural and Biosystems Engineering, Chonnam National Univ.
4Ph.D Candidate, Dept. of Rural and Biosystems Engineering, Chonnam National Univ.
5Ph.D Candidate, Dept. of Rural and Biosystems Engineering, Chonnam National Univ.
6Ph.D Candidate, Dept. of Rural and Biosystems Engineering, Chonnam National Univ.
1비회원, 일본 히로시마대학교 토목환경공학과 석사과정
2비회원, 일본 히로시마대학교 토목환경공학과 교수
3정회원, 전남대학교 지역·바이오시스템공학과 교수
4비회원, 전남대학교 지역·바이오시스템공학과 박사과정
5비회원, 전남대학교 지역·바이오시스템공학과 박사과정
6비회원, 전남대학교 지역·바이오시스템공학과 박사과정
*Corresponding Author
31 October 2025. pp. 7-19
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Abstract

Recently, the use of soil mixed with steelmaking slag (hereafter steelmaking slag‒mixed soil) as a landfill material for port construction projects has been increasing. Through laboratory tests, the effects of polyvinyl alcohol (PVA), a synthetic resin, on enhancing the initial strength and applicability of steelmaking slag-mixed soil, controlling turbidity during ocean dumping, and shortening the curing periods were examined. Vane shear tests and unconfined compression tests were conducted with varying amounts of slag and PVA to determine the optimal mix. The void ratio was calculated and the factors contributing to the observed change in strength were analyzed using scanning electron microscopy. Finally, to evaluate the applicability for port construction, turbidity and seawater exposure tests were conducted to assess the potential for the practical application of steel-slag-treated clay with PVA. Uniaxial compression tests of the samples cured for different periods showed that the use of PVA increased the initial strength owing to its adhesive properties, but the strength tended to decrease as curing progressed owing to an increase in the number of voids within the specimen and inhibition of the hydration reaction. Moreover, the combination with PVA did not lead to negative effects upon exposure to seawater. The effect on turbidity control immediately after curing of the mixed soil and the long-term durability in a seawater environment were also confirmed, indicating that the composite can be applied in port maintenance.

Keywords
Dredged soil
PVA
Steel slag
Trend of increasing intensity
Turbidity

최근, 항만공사를 위한 매립재로 제강슬래그 혼합토의 사용이 증가하고 있는 실정이다. 따라서 본 연구에서는 제강슬래그 혼합토의 초기강도증진과 해양투기시의 탁도제어 및 양생기간의 단축을 목적으로 합성수지인 PVA를 병용했을 때의 강도증진경향 및 항만정비시의 적용성을 실내실험을 통해 검토하였다. 본 연구에서는 슬래그와 PVA의 함량을 달리하여 베인 전단 시험과 일축 압축 시험을 수행하여 최적의 배합을 결정하였다. 다음으로, 공극률을 계산하고, SEM 분석을 통해 강도 변화에 기여하는 요인을 분석하였다. 마지막으로, 항만 건설에 대한 적용 가능성을 평가하기 위해 탁도 시험과 해수 노출 시험을 수행하여 PVA로 처리된 철강 슬래그 점토의 실제 적용 가능성을 평가하였다. 양생기간을 달리한 일축압축시험결과, PVA를 사용하면 접착 특성으로 인해 초기 강도가 증가했지만, 시편 내 공극 증가와 수화 반응 억제로 인해 경화가 진행됨에 따라 강도가 시간이 지남에 따라 감소하는 경향이 나타났다. 또한, PVA를 병용사용함으로써 해수노출시의 부정적인 요소는 보이지 않았으며, 혼합토의 양생직후 탁도제어효과와 해수 환경하에서 장기적인 내구성이 확인되어 항만 정비시의 적용이 가능한 것으로 나타났다.

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Information
  • Publisher :The Korean Geotechnical Society
  • Publisher(Ko) :한국지반공학회
  • Journal Title :Journal of the Korean Geotechnical Society
  • Journal Title(Ko) :한국지반공학회 논문집
  • Volume : 41
  • No :5
  • Pages :7-19
  • Received Date : 2024-09-12
  • Revised Date : 2025-09-26
  • Accepted Date : 2025-09-26
  • DOI :https://doi.org/10.7843/kgs.2025.41.5.7
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