Influence of Potassium on the Cement Clinker Formation : III. THe State and Formation Mechanism of Unstable Alkali

,; ,; ,; ,

J. Korean Ceram. Soc. > Volume 22(3); 1985 > Article

Journal of the Korean Ceramic Society 1985;22(3): 60.

시멘트 클린커 생성과정에 미치는 Potassium의 영향 III. 불안정 알칼리의 상태 및 생성기구

서일영, 최상홀

한양대 무기재료공학과

Influence of Potassium on the Cement Clinker Formation : III. THe State and Formation Mechanism of Unstable Alkali

ABSTRACT

The formation mechanism of unstable alkali and its existing states in the clinker were studied. The relation of unstable alkali content vs. other water-soluble components porosity and the distributionof potassium were investigated. The results are as follows :1) Two states of unstable alkali seem to exist in clinker ie compounds of $K_2O-Al_2O_3$ system and free $K_2O$ 2) The content of water-soluble $Al_2O_3$ tends to increase with increase of unstable alkali content, 3) Most of alkalies in clinker are concentrated in liquid phase at high temperature. Therefore it is possible to make various $K_2O-Al_2O_3$ system compounds according to the content of $K_2O$ in the liquid phase of clinker. In this experiment we found out a $K_2O-Al_2O_3$ compound of high $Al_2O_3$ content (34%) and high $K_2O$ content (33%) in clinker with 1.09% unstable alkali. 4) The porosity of clinker tends to increase with increase of unstable alkali content. 5) The amount of trapped alkali vapor may increase in closed pore in the clinker with high alkali and low $SO_3$ condecent. Therefore free $K_2O$ is the condensed alkali on the wall of closed pore in the clinker.