고로 서냉슬래그 혼합 시멘트 페이스트의 유동성 (Fluidity of Cement Paste with Air-Cooled Blast Furnace Slag)

서지정보

· 발행기관 : 한국세라믹학회
· 수록지 정보 : 한국세라믹학회지 / 51권 / 6호 / 584 ~ 590페이지
· 저자명 : 이승헌, 박설우, 유동우, 김동현

초록

Air-cooled slag showed grindability approximately twice as good as that of water-cooled slag. While the studied water-cooled slagwas composed of glass as constituent mineral, the air-cooled slag was mainly composed of melilite. It is assumed that the sulfur inair-cooled slag is mainly in the form of CaS, which is oxidized into CaS2O3 when in contact with air. CaS2O3, then, is released mainlyas S2O32-ion when in contact with water. However, the sulfur in water-cooled slag functioned as a constituent of the glass structure,so the S2O32− ion was not released even when in contact with water. When no chemical admixture was added, the blended cement of aircooledslag showed higher fluidity and retention effect than those of the blended cement of the water-cooled slag. It seems that thesediscrepancies are caused by the initial hydration inhibition effect of cement by the S2O32-ion of air-cooled slag. When a superplasticizer isadded, the air-cooled slag used more superplasticizer than did the blast furnace slag for the same flow because the air-cooled slag had higherspecific surface area due to the presence of micro-pores. Meanwhile, the blended cement of the air-cooled slag showed a greater fluidityretention effect than that of the blended cement of the water-cooled slag. This may be a combined effect of the increased use of superplasticizerand the presence of released S2O32-ion; however, further, more detailed studies will need to be conducted.

영어초록

Air-cooled slag showed grindability approximately twice as good as that of water-cooled slag. While the studied water-cooled slagwas composed of glass as constituent mineral, the air-cooled slag was mainly composed of melilite. It is assumed that the sulfur inair-cooled slag is mainly in the form of CaS, which is oxidized into CaS2O3 when in contact with air. CaS2O3, then, is released mainlyas S2O32-ion when in contact with water. However, the sulfur in water-cooled slag functioned as a constituent of the glass structure,so the S2O32− ion was not released even when in contact with water. When no chemical admixture was added, the blended cement of aircooledslag showed higher fluidity and retention effect than those of the blended cement of the water-cooled slag. It seems that thesediscrepancies are caused by the initial hydration inhibition effect of cement by the S2O32-ion of air-cooled slag. When a superplasticizer isadded, the air-cooled slag used more superplasticizer than did the blast furnace slag for the same flow because the air-cooled slag had higherspecific surface area due to the presence of micro-pores. Meanwhile, the blended cement of the air-cooled slag showed a greater fluidityretention effect than that of the blended cement of the water-cooled slag. This may be a combined effect of the increased use of superplasticizerand the presence of released S2O32-ion; however, further, more detailed studies will need to be conducted.

참고자료

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