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Tricalciumaluminate의 초기 수화반응에 미치는 $K_2O$의 영향
Effect of Potassium Oxide on the Early Hydration of Tricalciumaluminate

한기성   (인하대학교 공과대학 무기재료공학과UU0001092  ); 최만   (쌍용양회중앙연구소  ); 서일영   (쌍용양회중앙연구소  );
  • 초록

    Two kinds of clinker liquid melts, one containing 2.0% of $K_2O$ and the other without $K_2O$ , were prepared with the similar composition as those developed during the firing of portland cement clinker. One portion of melt was quenched and found to consist of glass together with traces of proto- $C_3A$ , and the other portion was allowed to cool spontaneously to crystallize $C_3A$ and calciumferrite well. The product obtained by crystallization of the melt without $K_2O$ showed cubic $C_3A$ , while orthorhombic $C_3A$ was formed from the crystallized product containing $K_2O$ . Studies on the hydration behavior of the samples made from the melts with 30% of gypsum were carried out for 24 hours by observation at regular intervals ettringite, monosulphate hydrates and gypsum which were formed or consumed during hydration. The samples without $K_2O$ in the melts were hydrated wth addition of proper amount of $K_2SO_4$ in the water for hydration. Hydration behavior of glassified $C_3A$ showed that it has low reactivity relative to crystallized $C_3A$ , and also hydration reactivity of orthorhombic $C_3A$ was much lower than that of cubic $C_3A$ in 60 minutes. Potassium sulphate in the solution reduced the hydration reactivity of $C_3A$ . Evolution peaks of hydration heat examined by twin-type conduction micro-calorimeter showed that glassified $C_3A$ without $K_2O$ had secondary peak after 9 hours and $C_3A$ containing $K_2O$ after 12 hours. When crystallized $C_3A$ was hydrated, initial peaks of hydration heat were considerably high and there was no secondary peak for cubic $C_3A$ but the secondary peak of orthorhombic $C_3A$ appeared after 4 hours.


  • 참고문헌 (13)

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 저자의 다른 논문

  • 한기성 (67)

    1. 1973 "혼합 cement의 개발 연구" 시멘트심포지엄 1 (): 31~40    
    2. 1974 "Silica의 형태가 Pozzolan 반응성에 미치는 영향" 요업학회지 = Journal of the Korean Ceramic Society 11 (1): 10~18    
    3. 1975 "저온소성 납석질 벽돌의 특성에 관한 연구(저온소성 ladle용 벽돌의 개발연구 제이보)" 요업학회지 = Journal of the Korean Ceramic Society 12 (2): 3~9    
    4. 1975 "상온에서의 Calcium Silicate 수화물의 생성반응" 시멘트심포지엄 2 (): 38~50    
    5. 1976 "시멘트 경화체의 건조수축과 그 기구" 시멘트심포지엄 4 (): 18~25    
    6. 1976 "Portland Cement Clinker의 현미경 관찰" 시멘트심포지엄 3 (): 18~18    
    7. 1977 "Rotary kiln 소성대 벽돌의 alkali 침식" 시멘트심포지엄 5 (): 68~78    
    8. 1978 "고노슬라그의 이용에 관한 연구(I) (슬라그유리의 결정성장)" 요업학회지 = Journal of the Korean Ceramic Society 15 (3): 157~167    
    9. 1978 "명반석을 이용한 알루미나 시멘트의 제조(I) (Monocalcium Aluminate의 합성)" 요업학회지 = Journal of the Korean Ceramic Society 15 (4): 199~204    
    10. 1979 "명반석을 이용한 알루미나 시멘트의 제조 (II) (알루미나 시멘트의 특성)" 요업학회지 = Journal of the Korean Ceramic Society 16 (3): 164~168    

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