Journal of the Korean Crystal Growth and Crystal Technology (한국결정성장학회지)

The Korea Association of Crystal Growth (한국결정성장학회)
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Properties of artificial aggregates of coal bottom ash-dredged soil system added with waste glass

폐유리가 첨가된 석탄바닥재-준설토 계 인공골재의 특성

  • Jo, Sinae (Department of Advanced Materials Engineering, Kyonggi University) ;
  • Kang, Seunggu (Department of Advanced Materials Engineering, Kyonggi University)
  • 조시내 (경기대학교 신소재공학과) ;
  • 강승구 (경기대학교 신소재공학과)
  • Received : 2013.03.21
  • Accepted : 2013.05.24
  • Published : 2013.06.30
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Abstract

In this study, the effect of addition of waste glassy slag produced from recycling of spent catalyst (denoted as waste glass hereafter) on the physical properties of artificial aggregates made of coal bottom ash and dredged soil (7 : 3 by weight base) was evaluated. Especially, the bloating behavior of artificial aggregates was analyzed by performing the relation study between the apparent density, water absorption and microstructure. The apparent density of artificial aggregates increased slightly with sintering temperature at $1050{\sim}1150^{\circ}C$, but decreased above $1150^{\circ}C$ showing bloating phenomenon. The bloating behavior of artificial aggregates was decreased so the apparent density increased with amount of waste glass added. Also, the water absorption of artificial aggregates decreased with sintering temperature. Above $1200^{\circ}C$, big fissure and much liquid were formed at the surface of artificial aggregates and these phenomena could be suppressed by increasing amount of waste glass added. The artificial aggregates fabricated in this study had an apparent density of 1.1~1.6 and water absorption of 8~22 % which meet KS requirements for the artificial lightweight aggregates.

본 연구에서는 석탄 바닥재와 준설토(7 : 3, 무게비율)로 제조된 인공골재의 물성에 미치는 폐촉매 유리질 슬래그(이하 폐유리로 칭함) 첨가 영향을 평가하였다. 특히 인공골재의 비중 및 흡수율 결과를 미세구조와 연계하여 그 발포특성을 고찰하였다. $1050{\sim}1150^{\circ}C$ 범위 내에서 인공골재 비중은 소성온도와 함께 약간 증가되었으나 그 이상의 소성온도에서는 감소하여 발포경향을 나타내었다. 폐유리 첨가량이 증가할수록 인공골재의 발포특성은 억제되었으며, 비중은 증가하는 경향을 보였다. 한편 인공골재 흡수율은 소성온도의 증가와 함께 감소하였다. $1200^{\circ}C$ 이상의 소성온도에서 표면에 균열이 발생함과 동시에 다량의 액상이 형성되었으나, 이러한 현상들은 폐유리를 첨가함으로서 제어할 수 있었다. 본 연구에서 제조된 인공골재의 비중은 1.1~1.6, 흡수율은 8~22 % 범위값을 나타내어 인공경량골재의 KS 기준을 만족하였다.

Keywords

References

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