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http://dx.doi.org/10.7843/kgs.2021.37.7.35

Effect of Low-Plastic Fine Content on the Engineering Properties of Kaolinite-Sand Mixture  

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.)
Publication Information
Journal of the Korean Geotechnical Society / v.37, no.7, 2021 , pp. 35-42 More about this Journal
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%.
Keywords
Index properties; Microscopic image; Void ratio; Sand dominant; Intermediate fine content; Fine dominant;
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