Economic and Environmental Geology (자원환경지질)

The Korean Society of Economic and Environmental Geology (대한자원환경지질학회)
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Study on expandability and X-ray coherent scattering domain size of bentonite from Gampo and Yonil area, Korea

감포와 연일 지역 벤토나이트의 팽창성 및 X-선 부합성 산란영역 크기에 관한 연구

  • 강일모 (연세대학교 지구시스템과학과) ;
  • 박석찬 (연세대학교 지구시스템과학과) ;
  • 문희수 (연세대학교 지구시스템과학과) ;
  • 유장한 (한국지질자원연구원)
  • Published : 2003.02.01
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Abstract

This study was performed to measure expandabilities and coherent scattering domain sizes (CSDs) of bentonite samples from Campo and Yonil area, Korea, using X-ray powder diffraction (XRD), and to compare their experimental data with those of international standard bentonite samples (SAz-1, STx-1, and SWy-2). Most of Gampo and Yonil bentonite samples comprised randomly interstratified illite-smectite (R0 I-S), and their expandabilities ranged over 77-100%S$_{XRD}$ from the saddle/001 method. The interstratification deformed 001 peaks of EG-solvated samples (Mering's first principle), which prohibited us from adopting these peaks to measure CSDs using BWA (Bertaut-Warren-Averbach) method. CSDs of the bentonite samples with R0 I-S could be measured through dehydration at 30$0^{\circ}C$ after K-saturation, where the deformation originated from the interstratification could be removed effectively. Campo and Yonil bentonite samples showed that their mean CSDs ranged over 3.8-5.4 interlayers, and that their CSDs distributions were similar to those of Gonzales (STx-1) and Wyoming (SWy-2) bentonite samples.

본 연구는 X-선분말회절(XRD)을 이용하여 감포와 연일에서 산출되는 벤토나이트에 대한 팽창성과 부합성산란영역크기(CSDs)를 측정하고, 이를 세계표준 벤토나이트(SAz-1, STx-1, SWy-2사 비교해 보고자 하였다. 에틸렌글리콜(EG)포화 시료에서 측정한 001 피크의 저각도 쪽 굴곡과 001 피크의 강도비(saddle/001 강도비)를 이용하여 감포와 연일 벤토나이트의 팽창성을 측정한 결과, 77-100% S$_{XRD}$를 보였으며, GP-56을 제외한 대부분은 무질서형 일라이트-스멕타이트 혼합층광물(RO I-S)로 구성되어 있었다. BWA(Bertaut-Warren-Averbach) 방법으로 CSDs를 측정한 결과, EG-포화시료의 001 피크는 혼합층에 의한 피크의 변형(Mering의 제 1 원칙)이 관찰되었으며, CSDs측정에 부적절하였다. 반면에, 300^{\circ}C$ 열-처리 시료의 001 피크는 혼합층에 의한 변형이 발생하지 않았으며 CSDs측정에 적합하였다. 열-처리 시료로부터 측정한 감포와 연일 벤토나이트의 평균 CSDs는 3.8-5.4층간으로 측정되었으며, 세계표준 벤토나이트와 비교하였을 때, CSDs 분포는 곤잘레스(STx-1)와 와이오밍(SWy-2) 벤토나이트와 유사하였다

Keywords

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