| 2성분 규불화염계 혼화제가 첨가된 시멘트의 수화반응 및 수밀성 변화 |
| 김재온, 남재현, 김도수1, 길배수1, 이병기1 |
대전대학교 건축공학과
1(주) 트라이포드 |
| Changes in Hydration and Watertightness of Cement Containing Two-Component Fluosilicate Salt Based Chemical Admixture |
| Jae-On Kim, Jae-Hyun Nam, Do-Su Kim1, Bae-Su Khil1, Byoung-Ky Lee1 |
Department of Architectural Engineering, Daejeon University
1Tripod Co., Inc. |
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| ABSTRACT |
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Fluosilicic acid ($H_2SiF_6$) is recovered as aqueous solution which absorbs $SiF_4$ produced from the manufacturing of industrial-graded $H_3PO_4$ or HF. Generally, fluosilicate salts prepared by the reaction between $H_2SiF_6$ and metal salts. Addition of fluosilicate salts to cement endows odd properties through unique chemical reaction with the fresh and hardened cement. In this study, two-component fluosilicate salt based chemical admixtures (MZ) of $4%,;6%$, and $8%$ concentration were prepared by the reaction of $H_2SiF_6$ ($25pm2%$) and metal salts. The effect of concentration of MZ at a constant adding ratio on the hydration and watertightness of cement were investigated respectively. In a cement containing MZ, metal fluorides such as $CaF_2$ and soluble silica by hydrolysis were newly formed during hydration. The total porosity of the hardened cement was lower in the presence of U because of packing role of metal fluoride and pozzolanic reaction of soluble $SiO_2$. Consequently, the watertightness of the hardened paste containing MZ was more improved than non-added (plain) due to an odd hydration between cement and MZ. |
| Key words:
Fluosilicate salt, Hydration, Watertightness, Metal fluoride |
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