• Title/Summary/Keyword: 쇄석

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Experimental Study for the Development of the Mixing Ratio as a Compaction Pile (다짐말뚝 재료로서 쇄석과 저회의 적정 혼합비 도출을 위한 실험적 연구)

  • Leem, Hansoo;Kim, Sunkon;Lee, Jooho;Chun, Byungsik
    • Journal of the Korean GEO-environmental Society
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    • v.13 no.9
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    • pp.5-16
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    • 2012

  • In the case of using the soil materials created by cutting in-situ ground directly without adjusting particle size, it is recommendable to seek the compaction property or material constant required for filling design or density control through indoor test, and many studies on this subject have been carried out during that time. The researches conducted during that time, however, were focused on the mixed materials with different diameters that exist in a natural condition. There has been no study conducted using coal fly ash that is by-product of the thermal power plant that is actively considered as the building materials. Therefore, this study was aimed at implementing compaction test and examining the basic engineering property in order to explore the influence of crushing the particles through compacting the admixture of crushed stone and coal fly ash produced from thermal power plant on its engineering property, and then the impact of the admixture volume of each material on compaction property and material property by conducting the One-Dimensional Compression Test. As result of compaction test, the optimum moisture ratio of coal fly ash was shown to be approx. 23%. As result of compaction test in accordance with the mixed ratio of coal fly ash and crushed stone under the same compaction energy and moisture ratio, dry unit weight tended to drop when the mixed ratio of coal fly ash exceeded 30%, while it reached approx. $1.81gf/cm^3$ when the mixed ratio was 30%. As result of One-Dimensional Compression Test in accordance with the mixed ratio of crushed stone and coal fly ash, the change in void ratio by particle crushing was at the highest level in the case of coal fly ash 100%, while the lowest level in the case of crushed stone 100%. In the case of mixed materials of crushed stone and coal fly ash, compression index was at the lowest level in case of coal fly ash 30%, and therefore this ratio of mixed material was judged to be the most stable from an engineering aspect.

  • KSCI

A Comparison on Performance of Rubble Support Media coated with Perlite and non-coated Media (쇄석 담체와 펄라이트로 코팅된 쇄석 담체의 성능 비교)

  • 박영식;안갑환
    • Journal of Environmental Health Sciences
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    • v.26 no.3
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    • pp.76-80
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    • 2000

  • The purpose of this study is to compare the performance of rubble support media coated perlite and non-coated media. As rubble was coated perlite, the porocity of reactor was increased 5.6%, whereas packing weight was decreased 17.6%. When rubble was coated perlite, microorganisms were attached on the surface of support media after 2 hours. TCOD removal efficiency of the reactor packed with rubble support media coated perlite was higher 4~9% than that of rubble. The end of experiment, MLVSS of rubble support media and rubble coated perlite was 1858.8mg/ι, 2785.9mg/ι, respectively.

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