Korean Journal of Materials Research (한국재료학회지)

Materials Research Society of Korea (한국재료학회)
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Effects of Chemical Composition of Ca(OH)2 and Precursors on the Properties of Fast-Curing Geopolymers

Ca(OH)2와 전구체의 화학 조성이 고속경화 지오폴리머의 물성에 미치는 영향

  • Ko, Hyunseok (Convergence Technology Division, Korea Institute of Ceramic Engineering and Technology) ;
  • Noh, Jung Young (Department of Metallurgical and Materials Engineering, Gyeongsang National University) ;
  • Lim, Hyung Mi (Convergence Technology Division, Korea Institute of Ceramic Engineering and Technology)
  • 고현석 (한국세라믹기술원 융합기술사업단) ;
  • 노정영 (경상대학교 나노신소재공학부 금속재료공학과) ;
  • 임형미 (한국세라믹기술원 융합기술사업단)
  • Received : 2019.10.01
  • Accepted : 2019.10.15
  • Published : 2019.11.27
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Abstract

Geopolymer is an alumina silicate-based ceramic material that has good heat-resistance and fire-resistance; it can be cured at room temperature, and thus its manufacturing process is simple. Geopolymer can be used as a reinforcement or floor finish for high-speed curing applications. In this manuscript, we investigate a high-speed curing geopolymer achieved by adding calcium to augment the curing rate. Metakaolin is used as the main raw material, and aqueous solutions of KOH and $K_2SiO_3$ are used as the activators. As a result of optimizing the high bending strength as a target factor for geopolymers with $SiO_2/Al_2O_3$ ratio of 4.1 ~ 4.8, the optimum ranges of the active agent are found to be $0.1{\leq}K_2O/SiO_2{\leq}0.4$ and $10{\leq}H_2O/K_2O{\leq}32.5$, and the optimum range of the curing accelerator is found to be $$0.82{\leq_-}Ca(OH)_2/Al_2O_3{\leq_-}2.87$$. The maximum flexural strength is found to be 1.35 MPa at $Ca(OH)_2/Al_2O_3=2.82$, $K_2O/SiO_2=0.3$, and $H_2O/K_2O=11.3$. The physical and thermal properties are analyzed to validate the applicability of these materials as industrial insulating parts or repairing finishing materials in construction.

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References

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