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2026 Vol.42, Issue 4
Production Optimization of Hydrophobic Geomaterials Using Jumunjin Standard Sand and Silane Solution

주문진 표준사와 실란 용액을 이용한 소수성 지반 재료의 제작 최적화에 관한 연구

Jin-Hyeong Kim1
,
Yeong-Woong Han2
,
Min-Jun Baek3
,
Byeong-Su Kim4*
김 진형1
,
한 영웅2
,
백 민준3
,
김 병수4*
1Member, Graduate Student, Dept. of Civil and Environment Engineering, Dankook Univ.
2Member, Graduate Student, Dept. of Civil and Environment Engineering, Dankook Univ.
3Member, Graduate Student, Dept. of Civil and Environment Engineering, Dankook Univ.
4Member, Prof., Dept. of Civil and Environment Engineering, Dankook Univ.
1정회원, 단국대학교 토목환경공학과 석사과정
2정회원, 단국대학교 토목환경공학과 석사과정
3정회원, 단국대학교 토목환경공학과 석사과정
4정회원, 단국대학교 토목환경공학과 부교수
*Corresponding Author
31 August 2026. pp. 9-20
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Abstract

This study investigated hydrophobic treatment as a means of mitigating rainfall-induced slope failures associated with the loss of apparent cohesion during soil saturation. Hydrophobic Jumunjin sand was prepared using a silane-based hydrophobic treatment to evaluate the optimal solution mixing ratio, assess solution reusability, and characterize its shear strength. The results indicated that a silane mixing ratio of 1.0% provided the highest water resistance. Although reusing the solution resulted in ~9.8% reduction in impermeability, no significant change in shear strength was observed. Direct shear tests further revealed that the friction angle of the hydrophobic sand was ~23% lower than that of untreated sand. However, no additional strength reduction occurred with repeated reuse of the silane solution. These findings support the reuse of the silane solution to produce hydrophobic sand while maintaining both hydraulic and mechanical performance. Therefore, hydrophobic geomaterials may be suitable for impermeable layers in slope stabilization, and this study provides fundamental insights for the development of durable and cost-effective slope protection methods.

Keywords
Hydrophobic geomaterial
Jumunjin sand
Shear strength
Silane solution
Water repellency

본 연구는 강우로 인한 사면 포화 과정에서 겉보기 점착력의 소실로 발생하는 사면파괴를 저감하기 위한 방안으로, 소수성 지반재료의 적용 가능성을 검토하기 위한 기초 연구를 수행하였다. 이를 위해 실란 기반 소수화 처리 공법을 적용하여 실란 용액의 최적의 혼합비, 재사용 가능성, 그리고 소수성 주문진 표준사의 전단강도 특성을 실험적으로 평가하였다. 실험 결과, 실란 용액의 최적 혼합 부피비는 1.0%로 나타났으며, 재사용 시 차수 성능은 약 9.8% 감소하였으나 전단강도에는 유의미한 변화가 관찰되지 않았다. 또한 직접전단시험 결과, 소수화 처리된 시료의 내부마찰각은 친수성 시료 대비 약 23% 감소하였으나, 실란 용액의 재사용에 따른 추가적인 강도 저하는 발생하지 않는 것으로 나타났다. 이러한 결과는 실란 용액의 반복 사용 가능성을 확인함과 동시에, 소수성 지반재료가 차수 성능과 공학적 강도 특성을 동시에 확보할 수 있는 대안적 재료로 활용 가능함을 시사한다. 따라서 본 연구는 사면 안정성 확보를 위한 새로운 차수 공법 개발에 기초적인 자료를 제공한다.

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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 : 42
  • No :4
  • Pages :9-20
  • Received Date : 2026-04-01
  • Revised Date : 2026-07-13
  • Accepted Date : 2026-07-14
  • DOI :https://doi.org/10.7843/kgs.2026.42.4.9
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