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김태연,추용식,서성관,윤석영 한양대학교 세라믹연구소 2018 Journal of Ceramic Processing Research Vol.19 No.5
In this study, we have made a cement based inorganic insulation material and added CSA (Hauyne Clinker) to reduce thedemolding time and enhance the handling workability. CSA contents were varied by 0%, 1%, 3%, 5% and the atmosphericsteam curing was tried for enhancing the compressive strength. As the CSA contents are increased to 5%, a rapid reactionof hydration caused the sinking of the slurry. So, the setting-retarder was added to control the reaction of hydration. By this,the sinking of the slurry was controlled but the height of the green body after expansions was a little bit lowered. In the CSAaddedslurry, it was possible to demold within 24 hours and in case of CSA 5%-added, the sufficient workability was secured. Atmospheric steam curing (temperatures −40 ~ 80 oC, for 6~10 hrs.) was attempted to improve the compressive strength andfound that an excellent strength of 0.25 MPa was achieved at 80 oC for 8 hrs. Specific gravity was about 0.12 ~ 0.13 g/cm3 andheat conductivity was about 0.045W/mK in all specimens. This strategy significantly improves the compressive strength ofCSA 5%-added specimen up to 25% compared to without CSA added specimen.
고로슬래그미분말 및 무수석고를 활용한 PHC말뚝 콘크리트용 혼화재 개발
한천구,김종백,Han, Cheon-Goo,Kim, Jong-Baek 대한건축학회 2011 대한건축학회논문집 Vol.27 No.8
This study investigated the possibility of high performance admixture for Pretensioned spun high strength concrete pile(PHC) to mix blast furnace slag and anhydrite with several fineness and replace contents. The results were following. The results for compressive strength, workability and economical efficiency was profitable when 40 %/C blast furnace slag with 8000 $cm^2/g$ and 1.14~11.66 % of anhydrite was used. For the hydrate properties using blast furnace slag and anhydrite mixture, the strength revelation was high caused by latent hydraulicity reaction and filling up effect as XRD and thermal analysis. when the anhydrite used heavy, the strength was decline because of expansion by too much ettringite generation. The blast furnace slag with 8000 $cm^2/g$ and anhydrite mixture could be used as mineral admixture for PHC using autoclave curing method, and it was effective at standard curing method. For these results, it could be a high performance admixture for high durability and flowability concrete.
고로슬래그미분말 및 무수석고를 활용한 PHC말뚝 콘크리트용 혼화재 개발
한천구(Han Cheon-Goo),김종백(Kim Jong-Baek) 대한건축학회 2011 大韓建築學會論文集 : 構造系 Vol.27 No.8
This study investigated the possibility of high performance admixture for Pretensioned spun high strength concrete pile(PHC) to mix blast furnace slag and anhydrite with several fineness and replace contents. The results were following. The results for compressive strength, workability and economical efficiency was profitable when 40 %/C blast furnace slag with 8000 ㎠/g and 1.14~11.66 % of anhydrite was used. For the hydrate properties using blast furnace slag and anhydrite mixture, the strength revelation was high caused by latent hydraulicity reaction and filling up effect as XRD and thermal analysis. when the anhydrite used heavy, the strength was decline because of expansion by too much ettringite generation. The blast furnace slag with 8000 ㎠/g and anhydrite mixture could be used as mineral admixture for PHC using autoclave curing method, and it was effective at standard curing method. For these results, it could be a high performance admixture for high durability and flowability concrete.