석탄바닥재-매립회-준설토 계 인공골재의 발포특성에 미치는 적니 첨가 효과 (Effect of Red Mud Additions on Bloating behavior of Artificial Aggregates Made from Coal bottom Ash-Land Fill Ash-Dredged Soil System)

서지정보

· 발행기관 : 한국폐기물자원순환학회
· 수록지 정보 : 한국폐기물자원순환학회지 / 28권 / 1호 / 67 ~ 74페이지
· 저자명 : 강승구, 강민아

초록

The artificial aggregates (AAs) of spherical shape of diameter = 8 mm containing bottom ashes or landfill ashes discharged from a thermal power plant and dredged soil were manufactured by direct sintering method at 1050 ~ 1250℃ for 10minutes. And the red mud additions effect on the bloating phenomenon of AAs was analyzed. The black-coring phenomenon was well-developed and the specific gravity decreased gradually with increasing temperature for the AAs containing landfill ash. Especially the specific gravity of 1 or less was obtained at sintering temperature 1150℃ and over. As the sintering temperature increased, the black core part was gradually enlarged, burst open out of red shell and the absorption rate of AAs containing landfill ash increased due to its exposing to the air caused by shell-breaking. The AAs made with coal bottom ashes did not show the black-coring phenomenon because the excess unburned carbon in the bottom ash induced inordinate reducing atmosphere followed by blacking the whole specimen. Also the specific gravity increased with increasing temperature caused by the no-bloating. The AAs containing bottom ash of the specific gravity 1.4 ~ 1.8 were obtained when the 10 ~ 20wt% red mud was added, and those specimens could be classified into the light ~ heavy aggregates. The AAS containing landfill ash, on the other hand, had the specific gravity 1 or less when the 10wt% red mud was added and sintered at below 1150℃ or under.

영어초록

The artificial aggregates (AAs) of spherical shape of diameter = 8 mm containing bottom ashes or landfill ashes discharged from a thermal power plant and dredged soil were manufactured by direct sintering method at 1050 ~ 1250℃ for 10minutes. And the red mud additions effect on the bloating phenomenon of AAs was analyzed. The black-coring phenomenon was well-developed and the specific gravity decreased gradually with increasing temperature for the AAs containing landfill ash. Especially the specific gravity of 1 or less was obtained at sintering temperature 1150℃ and over. As the sintering temperature increased, the black core part was gradually enlarged, burst open out of red shell and the absorption rate of AAs containing landfill ash increased due to its exposing to the air caused by shell-breaking. The AAs made with coal bottom ashes did not show the black-coring phenomenon because the excess unburned carbon in the bottom ash induced inordinate reducing atmosphere followed by blacking the whole specimen. Also the specific gravity increased with increasing temperature caused by the no-bloating. The AAs containing bottom ash of the specific gravity 1.4 ~ 1.8 were obtained when the 10 ~ 20wt% red mud was added, and those specimens could be classified into the light ~ heavy aggregates. The AAS containing landfill ash, on the other hand, had the specific gravity 1 or less when the 10wt% red mud was added and sintered at below 1150℃ or under.

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