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J. Korean Ceram. Soc. > Volume 39(2); 2002 > Article
Journal of the Korean Ceramic Society 2002;39(2): 178.
doi: https://doi.org/10.4191/kcers.2002.39.2.178
규불화아연(ZnSiF6, aq)이 첨가된 시멘트의 유동성과 수화특성
김도수, 길배수, 임헌성1, 남재현2, 노재성3
(주)알엔에프텍 기업부설연구소
1한국화학연구원 분석실
2대전대학교 건축공학과
3충남대학교 정밀공업화학과
Fluidity and Hydration Properties of Cement Paste Added Zinc Fluosilicate(ZnSiF6, aq.)
Do-Su Kim, Bae-Su Khil, Heon-Seong Lim1, Jae-Hyun Nam2, Jae-Seong Rho3
R & D Center, Recycling and Fluorine Tech. Co. Ltd.
1Chemical Analysis Lab., Korea Research Institute of Chemical Technology
2Department of Architectural Engineering, Daejeon University
3Department of Fine Chemicals Engineering and Chemistry, College of Engineering, Chungnam National University
ABSTRACT
Zinc fluosilicate ($ZnSiF_6$, 15% aqueous solution) was prepared using zinc oxide (ZnO) and fluosilicic acid ($H_2SiF_6$) by soluiton synthetic method. The fluidity and hydration properties of cement which was added $ZnSiF_6$ (aq.) as an additive for cement were studied. At water to cement ratio (W/C) equals to 0.45, the initial fluidity and slump loss of cement paste which the addition of $ZnSiF_6$ (aq.) was increased from 1.0% to 4.0% based on cement weight were investigated. Initial fluidity of cement paste was measured by mini-slump test and slump loss was examined by measuring the fluidity variation of cement paste with time elapsed from 0 min to 120 min at intervals 30 min. Also, the effect of $ZnSiF_6$ addition on the setting and hydration of cement paste when $ZnSiF_6$ increased in the addition range 1.0% to 3.0% were investigated. The fluidity of cement paste which was added 2.1% $ZnSiF_6$ (aq.) presented the highest value among all addition ranges. The setting time of cement paste was retarded gradually and the heat evolution of hydrated cement was reduced with the increasing of $ZnSiF_6$ addition.
Key words: Zinc fluosilicate salts, Mini-slump, Slump loss, Fluidity, Cement hydration
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