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Research Article

Analysis of Physical and Chemical Properties of CFBC Fly Ash in Vietnam for Solidification

고화재 활용을 위한 베트남 CFBC 플라이애시의 물리적·화학적 특성 분석

Kyongnam Min1*
,
Jaewon Lee1
,
Dongwon Lee1
,
Jinhee Kim1
,
Chanmuk Jung2
민 경남1*
,
이 재원1
,
이 동원1
,
김 진희1
,
정 찬묵2
1Department of Geotechnical, Sejong E'C, Daejeon, Korea
2College of Railroad and Transportation, Woosong University
1(주)세종이엔씨
2우송대학교 철도물류대학
* 교신저자* Corresponding Author
September 2017. pp. 245-253
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Abstract

Vietnam CFBC fly ash has high CaO content and can be used as a solidification agent for soft ground improvement. However, most fly ash is treated as landfill or waste. In order to utilize fly ash as a solidification agent for soil improvement, the charac­teristics of fly ash must be accurately determined. In this study, laboratory tests were conducted on fly ash from four CFBC power plants to evaluate the utility of Vietnam fly ash as a solidification agent. As a result of analyzing the physical properties, it was analyzed that all four samples were suitable as material for solidification agent and have suitable particle size for the improve­ment of soft ground. As a result of analysis of chemical characteristics, it was analyzed that the fly ash of one place could be used as a solidification agent because of the high content of free-CaO. The remaining three fly ash was not suitable for use as a solid­ification agent due to low Free-CaO content. However, it has a chemical composition similar to that of general fly ash in Korea, so it can be recycled in various ways.

Keywords
Fly ash
CFBC
Solidification agent
Soft ground

베트남 CFBC 플라이애시는 CaO 성분이 높아 연약지반 개량을 위한 고화재로 활용 가능하지만 대부분 매립이나 폐기물로 처리되고 있는 실정이다. 플라이애시를 지반 개량용 고화재로 활용하기 위해서는 플라이애시의 성상과 특성을 정확히 파악해야 한다. 본 연구에서는 베트남 플라이애시의 연약지반 고화재로의 활용성을 평가하기 위하여 CFBC 발전소 4개소에서 채취한 플라이애시를 대상으로 물리적, 화학적 특성분석을 위한 실내시험을 실시하였다. 물리적 특성 분석결과 4개소 시료 모두 고화재 의 원료로서 재료적 활성도 및 연약지반 개량공사에 적합한 입도를 가지는 것으로 분석되었다. 화학적 특성 분석결과 1개소의 플라이애시는 Free-CaO 함량이 높아 연약지반 개량용 고화재로 활용이 가능할 것으로 분석되었다. 나머지 3개소의 플라이애시 는 Free-CaO 함량이 낮아 고화재로 활용하기에 적합하지 않았다. 하지만 국내 일반 플라이애시와 유사한 화학조성을 가지고 있어 다양한 형태로 재활용이 가능할 것으로 판단된다.

키워드
플라이애시
순환유동층보일러
고화재
연약지반
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Information
  • Publisher :Korean Society of Engineering Geology
  • Publisher(Ko) :대한지질공학회
  • Journal Title :The Journal of Engineering Geology
  • Journal Title(Ko) :지질공학
  • Volume : 27
  • No :3
  • Pages :245-253
  • Received Date : 2017-08-02
  • Revised Date : 2017-09-17
  • Accepted Date : 2017-09-20
  • DOI :https://doi.org/10.9720/kseg.2017.3.245
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