Journal of the Korea Institute of Building Construction (한국건축시공학회지)

The Korean Institute of Building Construction (한국건축시공학회)
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Purity of γ-Dicalcium Silicate with Synthetic and Raw Materials Conditions

합성 및 원료 조건에 따른 γ-C2S의 순도

  • Lee, Seok-Hee (Energy and Environmental Division, Korea Institute of Ceramic Engineering and Technology) ;
  • Cho, Hyeong-Kyu (Energy and Environmental Division, Korea Institute of Ceramic Engineering and Technology)
  • Received : 2019.10.17
  • Accepted : 2020.01.16
  • Published : 2020.04.20
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Abstract

γ-dicalcium silicate(γ-C2S) is known as a polymorphism of belite. Due to its high CO2 fixing capacity and the production process with low CO2 emission, γ-C2S has attracted more attention of researchers. For the further development of γ-C2S applications in construction industry, this study aims to investigate the method for synthesizing high purity of γ-C2S. The influence of raw materials and calcination temperatures on the purity of γ-C2S was evaluated. Several Ca bearing materials were selected as the calcium source, the materials which's main component is SiO2 were used as the silicon source. Raw materials were mixed and calcined under different temperatures. The results revealed that the highest purity could be obtained using Ca(OH)2 and SiO2 powder as raw materials. In addition, a relatively economic synthesis method using natural mineral materials-limestone and silica sand as raw materials were developed for the practical application. The purity of synthetic γ-C2S was recorded up to 77.6%.

γ-C2S(γ-Calcium Silicate)는 벨라이트(belite)의 다형성으로 알려져 있다. γ-C2S는 CO2 고정 능력이 우수하고 제조 시 CO2 배출량이 적은 공정으로 인해 최근 많은 관심을 받고 있는 시멘트계 재료이다. 본 연구에서는 γ-C2S의 건축재료로써 활용하기 위하여 γ-C2S의 고순도 합성을 위한 다양한 합성방법을 조사하고 이를 기반으로 조건별 합성 실험 및 분석을 실시하였으며 γ-C2S의 순도에 대한 다양한 원료와 소성 온도가 미치는 영향도 평가하였다. 여러 종류의 Ca 결합물 재료가 Ca 공급원으로 사용 되었고 Si 소스 공급원으로는 Si가 주성분인 SiO2가 사용되었다. 각각의 원료는 혼합 후 다양한 조건에서 소성시켰다. 그 결과 Ca(OH)2와 SiO2 분말을 원료로 합성하였을 때 최고 높은 γ-C2S 순도를 얻을 수 있었다. 그리고 γ-C2S 제조 실용화를 위해 천연 광물인 석회암 분말과 실리카 모래를 원료로 한 분말을 사용하여 다양한 소성온도에서 합성하였으며 그 결과 합성한 샘플의 γ-C2S의 순도는 77.6%로 나타났다.

Keywords

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