J. Korean Ceram. Soc. > Volume 49(6); 2012 > Article
 Journal of the Korean Ceramic Society 2012;49(6): 575. doi: https://doi.org/10.4191/kcers.2012.49.6.575
 무기질 원료에 따른 지오폴리머의 압축강도 특성 주기태, 이태근, 박미혜, 황연 서울과학기술대학교 신소재공학과 Compressive Strength of Geopolymers while Varying the Raw Materials Gi-Tae Joo, Tae-Kun Lee, Mihye Park, Yeon Hwang Department of Materials Science & Engineering, Seoul National University of Science & Technology ABSTRACT Geopolymers were synthesized using raw materials produced from two different areas: one was from Indonesia and the other was from Habcheon, Korea. The constituting phases of the Indonesian raw material were quartz and kaolinite, while those of the Habcheon sample were quartz, halloysite and albite. They were both calcined at $750^{circ}C$ for 6 hours, and solution of NaOH and water glass was added to activate the geopolymeric reaction. The compressive strength of geopolymer synthesized from the Indonesian raw material showed a low value of $151;kgf/cm^2$ after curing for 28 days. However, it could be greatly increased by adding blast furnace slag powders of $1188;kgf/cm^2$ and $1969;kgf/cm^2$ at 20 wt% and 40 wt% additions, respectively. The compressive strength of the geopolymer synthesized from the Habcheon raw material was high, at $557;kgf/cm^2$, after 28 days, and the very high early-stage (3 days) strength of $556;kgf/cm^2$ for this sample was remarkable. Commercially available Habcheon metastate raw material, of which composition showed low CaO and $Na_2O$ contents compared to the calcined Habcheon raw material, was also examined. It was found that the compressive strength of the commercial metastate type was nearly identical to that of the calcined Habcheon raw material except for the relatively low value at an early curing stage and at a high curing temperature of $60^{circ}C$. Key words: Geopolymer, Compressive strength, Alkali activation
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