Journal of the Korean Ceramic Society (한국세라믹학회지)

The Korean Ceramic Society (한국세라믹학회)
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Compressive Strength of Geopolymers while Varying the Raw Materials

무기질 원료에 따른 지오폴리머의 압축강도 특성

  • Joo, Gi-Tae (Department of Materials Science & Engineering, Seoul National University of Science & Technology) ;
  • Lee, Tae-Kun (Department of Materials Science & Engineering, Seoul National University of Science & Technology) ;
  • Park, Mihye (Department of Materials Science & Engineering, Seoul National University of Science & Technology) ;
  • Hwang, Yeon (Department of Materials Science & Engineering, Seoul National University of Science & Technology)
  • 주기태 (서울과학기술대학교 신소재공학과) ;
  • 이태근 (서울과학기술대학교 신소재공학과) ;
  • 박미혜 (서울과학기술대학교 신소재공학과) ;
  • 황연 (서울과학기술대학교 신소재공학과)
  • Received : 2012.06.25
  • Accepted : 2012.10.23
  • Published : 2012.11.30
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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 $60^{\circ}C$.

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References

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