Influences of Chlorides on the Whiteness in White Portland Cement

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J. Korean Ceram. Soc. > Volume 13(2); 1976 > Article

Journal of the Korean Ceramic Society 1976;13(2): 3.

백시멘트의 백색도에 미치는 염화물의 영향

한기성, 최상흘¹, 서일영¹

인하대 요어공학과
¹한양대 요업공학과

Influences of Chlorides on the Whiteness in White Portland Cement

ABSTRACT

Influences of chlorides(CaCl2, MgCl2, NaCl) on the colouring effect of Fe component in white portland cement was investigated. Chlorides enhance the whiteness of the white portland cement owing to volatilization of Fe2O3 and translation of ferrite composition toward C2F. This translation is caused by consumption of alumina at the formation of C12A7, the formation of which is promoted in the presence of chloride. With decrease of p in ferrite composition C6F1-pAp, transfer of Fe3+ from 4 to 6 coordinated cite is occurred, and as a result, whiteness is raised. Hydration process of the cement containing a small amount of chloride differs little from the one without chloride.