Influences of Cooling Atmosphere on the Whiteness in White Portland Cement

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J. Korean Ceram. Soc. > Volume 15(2); 1978 > Article

Journal of the Korean Ceramic Society 1978;15(2): 85.

백 시멘트의 백색도에 미치는 냉각분위기의 영향

한기성, 최상흘¹

인하대 요업과
¹한양대 요업과

Influences of Cooling Atmosphere on the Whiteness in White Portland Cement

ABSTRACT

Influence of cooling atmosphere on the whiteness in white portland cement was studied. The effective composition of gaseous medium of cooling atmosphere is desirable less than 0.5% of $O_2$ and 0.5~1.5% of CO. When theclinker is quenched in nitrogen atmosphere, the color of clinker becomes bright pink. In a weakly reducing gaseous medium or vacuum, the absence of oxygen brings defects in crystal and transformation in the coordination of iron, and as a result, whiteness is raised.