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방완근,이승헌,김창은 한국세라믹학회 1999 한국세라믹학회지 Vol.36 No.3
보통 포틀랜드 시멘트와 플라이애쉬, 슬래그를 혼합한 혼합시멘트 경화체를 이용하여 이온 확산에 미치는 혼합재의 영향과 양이온 공존시 염소이온의 확산에 대하여 고찰하였다. 겉보기 이온확산계수가 보통 포틀랜드의 시멘트보다 플라이애쉬와 슬래그를 혼합한 시멘트 경화체가 약 10-3배로 매우 낮은 값을 나타내었다. 이것은 포졸란 반응에 의해 많은 CSH 수화물이 capillary pore에 형성되어 macro pore가 감소되고 micro pore가 증가되어 이온 확산에 대한 저항이 커졌기 때문이다. 또한, Mg2+이온 공존시에 염소이온의 확산은 증가되었다.
방완근,김창은,강성근 연세대학교 산업기술연구소 1997 논문집 Vol.29 No.1
Iron-bearing cold bonded pellets using blast fumace slag with various activators were prepared and cured at different conditions. The specimens were evaluated by UTM analysis and compared with pellets using ordinary Portland cement. To clarify the hardening mechanism of slag binder, XRD, DTA, Calorimeter, SEM and other analyses were performed. Hydration product identifications and compressive strength measurement revealed that if activators and curing conditions were properly chosen, Cement can be replaced with slag binder in cold bonded pellet preparation.
플라이애쉬 혼합시멘트에 미치는 Na$_2$SO$_4$의 영향
정석재,방완근,김창은 한국세라믹학회 1998 한국세라믹학회지 Vol.35 No.11
In order to prohibit the delay of early stage hydration activator Na2SO4 was added to Fly Ash blended ce-ment and its effects were investigated. Various measurements such as Compressive strength Heat of hy-dration Pore size distribution Hydration products Microstructure were evaluated and the results show that specimens of Fly Ash(50wt%) with 5% Na2SO4 dramatically improved the compressive strength because pozzolanic reaction of Fly Ash and the formation of ettringite make th microstructure denser than OPC and flyash cement paste.
강성근,방완근,이승헌,김창은 한국세라믹학회 1999 한국세라믹학회지 Vol.36 No.7
It is a fundamental experiment to use blast-furnace slag in solidification/stabilization process. The compressive strength and leaching test of Pb and Cr doped samples were evaluated and the effects of heavy-metal ions on the hydration of slag was investigated. Sodium silicates(5wt%) was added as alkali-activator and the effects of replacing a part of slag with flyash or gypsum was also discussed. Pb ion was solidified by encapsulation of matrix. In of slag${\pm}$gypsum binder microstructure was densified by accelerating to form AFt/AFm phase and compressive strength was improved resulting in reducing leaching amount of Pb ion. Cr ion was solidified by substituting with Al ion in aluminate product. Slag+fly ash binder improved compressive strength and decreased leaching amount of Cr ion.