Journal of the Korean Geotechnical Society (한국지반공학회논문집)

Korean Geotechnical Society (한국지반공학회)
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Effect of Low-Plastic Fine Content on the Engineering Properties of Kaolinite-Sand Mixture

저소성 세립분 함량이 카올리나이트-모래 혼합토의 공학적 특성에 미치는 영향

  • Kaothon, Panyabot (Dept. of Civil Engrg., Gangneung-Wonju National Univ.) ;
  • Lee, Su-Hyung (Advanced Railroad Vehicle Division, Korea Railroad Research Institute) ;
  • Choi, Yeong-Tae (Advanced Railroad Civil Engrg. Division, Korea Railroad Research Institute) ;
  • Yune, Chan-Young (Dept. of Civil Engrg., Gangneung-Wonju National Univ.)
  • Received : 2021.06.14
  • Accepted : 2021.07.21
  • Published : 2021.07.31
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Abstract

An experimental study was carried out on kaolinite-sand mixtures with various proportions of kaolinite content. To investigate physical behaviour of mixtures, index properties and compaction test results were analysed in various aspects. Moreover, to clearly see the interaction between kaolinite and sand particles, the observational analysis through microscopic image analysis device was conducted. The test results showed that an increase in the amount of kaolinite could create a strong bonding structure which resulted in higher specific surface available for activities of kaolinite particles. Also, an increase in the amount of the kaolinite resulted in an increase in the percentage of water sorption. Then it could accelerate the occupation rate of water which tended to take up the space that would have been occupied by solid particles, and accordingly, resulted in the decreased maximum dry unit weight and increased initial void ratio. Based on the microscopic image analysis, the samples were individually classified into three types of mixture such as sand dominant, intermediate fine content, and fine dominant. In addition, the fine and coarse grains seem to interact well in the mixtures with the fine content ranging from 25 to 40%.

본 연구에서는 다양한 카올리나이트 혼합비에 따른 카올리나이트-모래 혼합토의 특성을 실험적으로 분석하였다. 이를 위하여 기본물성실험과 다짐시험을 실시하고 그 결과를 분석하였으며, 카올리나이트와 모래입자 간의 상호 구조를 더욱 자세히 분석하기 위하여 현미경 사진을 이용한 관측을 추가적으로 수행하였다. 실험결과, 카올리나이트 혼합비가 증가할수록 비표면적의 증가에 따른 함수비의 증가 및 모래입자와의 강한 결합구조를 형성하는 것으로 나타났으며, 최대 건조밀도는 감소하고 초기간극비는 증가하는 것으로 나타났다. 현미경 사진 분석 결과, 세립분 함량의 증가에 따라 모래의 특성이 지배적인 비율, 중간 비율, 세립분의 특성이 지배적인 비율을 확인할 수 있었으며, 세립분의 함량이 25-40% 정도인 경우에 입자간 상호작용이 잘 이루어지는 것을 관측할 수 있었다.

Keywords

Acknowledgement

This research was supported by a grant from R&D Program (PK2103A3 ) of the Korea Railroad Research Institute, Republic of Korea.

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