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Vol.46, No.7, 437 ~ 443, 2008
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| Title |
| The Synthesis and Hydraulic properties of Calcium Sulfo Aluminate(CSA) derived from Secondary Refining Slag |
| 서창우 Chang Woo Seo , 김선효 Seon Hyo Kim , 고상진 Sang Jin Ko , 김상현 Sang Hyun Kim , 조규용 Kyu Young Jo |
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| Abstract |
| The synthesis and hydration of Calcium Sulfo Aluminate[3CaO·3Al2O3·CaSO4(C4A3S), CSA cement utilizing secondary steelmaking refining slags is studied for recycling the discarded steel plant wastes to meet the environmental requrations imposed on the steel industry. Raw materials of secondary refining slag, lime sludge, gypsum and bauxite were prepared to be sintered at 1,250℃. The sintered samples were hydrated for 1, 3 and 7 days to evaluate the mineralogical and physico-mechanical properties. The hydration products evaluated with the aid of SEM and XRD analyses confirmed the formation and the continuing growth of ettringite phase with the further hydration times, which plays a role in developing the early strength and the expansion properties of cements. The physico-mechanical properties of hydrated CSA products employing the recycled steelmaking refining slags determined in terms of compressive strength and linear expansion of hydrated products are found to be superior to those of the Ordinary Portland Cement(OPC) or the other commercial CSA cements. |
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| Key Words |
| CSA(C4A3S), ettringite, secondary steelmaking refining slag, hydration |
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