Journal of the Korean Ceramic Society (한국세라믹학회지)

The Korean Ceramic Society (한국세라믹학회)
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Influence of Potassium on the Cement Clinker Formation I. Unstable Free Alkali in Clinker

시멘트 클린커 생성과정에 미치는 Potassium의 영향 I. 불안정 상태의 알칼리

  • 서일영 (한양대학교 무기재료공학과) ;
  • 최상홀 (한양대학교 무기재료공학과)
  • Published : 1985.01.01
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Abstract

The states of alkali occuring in Portland cement clinker were studied. Potassium was added to raw mixture by there kinds ; $K_2SO_4$, $K_2CO_3$ and KOH. In case of $K_2CO_3$ and KOH addition the new state of unstable alkali was found when alkakli content is high and $SO_3$ content is low in the clinker. Unstable state of highly basic free 4K_2O$ causes lowering burnability much more than alkali sulfate especially at the early stage of burning. Lowered burnability by 4K_2O$ became more serious with higher LSF. Unstable free-4K_2O$ which is readily soluble with water reacts with gypsum to form $Ca(OH)_2$ and syngenite as soon as water is added. As a results the liberation rate of heat of hydration at the early hydration process(1st peak) was increased.

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References

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