석탄 바닥재와 점토를 이용한 인공경량골재 제조
Manufacturing artificial lightweight aggregates using coal bottom ash and clay
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초록
화력발전소에서 발생하는 석탄 바닥재(bottom ash)와 점토를 혼합하여 성형 후, 소성하여 인공경량골재를 제조 하고, 소성온도와 조성 변화에 따른 물성을 분석하였다. 바닥재는 입경이 4.75 mm 이상인 입자가 13 wt% 정도로 거친 분 말로 압출성형을 위하여 미분쇄 공정이 필요하였다. 또한 바닥재는 미연탄소(C)를 다량 함유하고 있어 소결 시 C의 산화반 응과 이에 따른 가스발생으로 소결체의 경량화를 유도하였다. 점토에 바닥재 첨가량이 증가할수록 소성 지수가 감소하였고 이에 따라 성형체의 성형성이 저하되었으나 바닥재 첨가량이 40 wt% 까지의 성형체는 소성 지수 및 소성 한계값이 각각 약 10과 22로서 압출성형이 가능하였다. 바닥재가 30~50 wt% 첨가되고 1150~1200 o C 범위에서 소결된 골재는 부피비중 1.3~1.5, 흡수율 14~16 %를 나타냈고 따라서 고층빌딩이나 교량 등의 골재대체재로써의 가능성이 확인되었다.
Abstract
The artificial lightweight aggregate (ALA) was manufactured using coal botom ashes produced from athermoelectric power plant with clay and, the sintering temperature and batch composition dependence upon physicalproperties of ALA were studied. The botom ash (BA) had 13 wt% coarse particle (>4.75 m) and showed very irregularmany unburned carbon which generates the gas by oxidation and lighten agregate during a sintering process. Plasticindex of green bodies decreased with increasing bottom ash content but the extrusion forming process was possible for thegreen body containing BA up to 40 wt% whose plastic index and plastic limit were around 10 and 22 respectively. TheALA containing 30~40 wt% BA sintered at 1100~1200oC showed a volume specific density of 1.3~1.5 and waterabsorption of 13~15 % and could be apled for high-rise building and super-long bridge.Key words Artificial lightweight aggregates, Coal botom ash, Plasticity index, Aterberg limit, Bloating
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