Effect of the Treated Amounts with Asphalt and Carbon Black on the Early Hydration and the Physical Properties of Portland Cement

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J. Korean Ceram. Soc. > Volume 26(5); 1989 > Article

Journal of the Korean Ceramic Society 1989;26(5): 609.

Asphalt와 Carbon Black처리양이 포틀랜드 시멘트의 물리적 특성 및 초기수화에 미치는 영향

홍원표, 조헌영, 황의환¹

충남대학교 공과대학 화학공학과
¹한국표준연구소 방사선연구실

Effect of the Treated Amounts with Asphalt and Carbon Black on the Early Hydration and the Physical Properties of Portland Cement

ABSTRACT

For the development of high durable portland cement, it was tested that the some physical properties of ordinary portland cements (OPC) treated with 0.3-1.5wt.% asphalt and 0.5-1.0wt.% carbon black. From the results, the contact angles of water against cements treated with more than 0.6wt.% asphalt were increased over 80 degrees, the initial and the final setting times of cement paste were delayed about 20min. according to the every 0.3wt.% increase of asphalt. The first and the second pick heights of the hydration curve of the cement were considerabely decreased and the induction period of that was increased. And so, the cumulative hydration heat of the cement which was treated with 0.6wt.% asphalt and 0.5wt.% carbon black was lower about 10cal/g than that of ordinary portland cement during 42 hydration times.