산업부산물에 의해 다중소성된 C12A7의 수화특성 (Hydration Properties of Multi-sintered 12CaO·7Al2O3 by Recycling Waste Resources)

서지정보

· 발행기관 : 한국폐기물자원순환학회
· 수록지 정보 : 한국폐기물자원순환학회지 / 40권 / 1호 / 21 ~ 28페이지
· 저자명 : 송현진, 서병돌, 최우석, 김동필, 송명신

초록

Low-temperature calcined cement is a required solution in the cement industry for reducing energy requirements and CO2 emissions. 12CaO·7Al2O3 (hereinafter C12A7) is a calcium aluminate-based mineral that has properties of rapid hardening, expansion, and ultra-high strength. C12A7 is mainly produced by the high-temperature melting method, but applying the low-temperature synthesis method (the hydrate sintering method) of C3A can enable its low-temperature production without any melting process. In this study, C12A7 was synthesized using waste limestone and waste alumina that was decarboxylated at 900oC for one hour and then calcined at 1,200oC for one hour (this process was repeated twice) to study the hydration properties of the synthesized C12A7. The synthesis yield of the synthesized C12A7 was 70% and the setting time for the synthesized C12A7 hydrates finished within one minute but the setting time of the synthesized C12A7 substituted for 50% gypsum was 158 minutes. The compressive strength of the synthesized C12A7 substituted for 20% gypsum was 8.2 MPa.

영어초록

Low-temperature calcined cement is a required solution in the cement industry for reducing energy requirements and CO2 emissions. 12CaO·7Al2O3 (hereinafter C12A7) is a calcium aluminate-based mineral that has properties of rapid hardening, expansion, and ultra-high strength. C12A7 is mainly produced by the high-temperature melting method, but applying the low-temperature synthesis method (the hydrate sintering method) of C3A can enable its low-temperature production without any melting process. In this study, C12A7 was synthesized using waste limestone and waste alumina that was decarboxylated at 900oC for one hour and then calcined at 1,200oC for one hour (this process was repeated twice) to study the hydration properties of the synthesized C12A7. The synthesis yield of the synthesized C12A7 was 70% and the setting time for the synthesized C12A7 hydrates finished within one minute but the setting time of the synthesized C12A7 substituted for 50% gypsum was 158 minutes. The compressive strength of the synthesized C12A7 substituted for 20% gypsum was 8.2 MPa.

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