| 염소 고함유시멘트의 페이스트 유동성과 모르타르 강도발현성에 미치는 화학 혼화제의 영향 |
| 정찬일, 박수경, 이의학, 이경희 |
| 명지대학교 신소재공학과 |
| Effects of Chemical Admixture on the Paste Fluidity and Mortar Strength Development of High Chloride Cement |
| Chan-Il Jeong, Soo-Kyung Park, Eui-Hak Lee, Kyung-Hee Lee |
| Department of Materials Science and Engineering, Myongji University |
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| ABSTRACT |
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To examine the effects of chemical admixture on the fluidity and strength development of high chloride cement, experiments were conducted in which lignosulfonate (LS), naphthalenesulfonate (NS), and polycorboxylate (PC) were each added in standard and excessive amounts, and the results were as follows. 1. Because adding KCl to NS causes a decrease in flow, adding PC is better in maintaining high cement fluidity. 2. When cement contained much chloride comes in contact with water, hydration begins 4 h after contact and securing workability becomes difficult, but by adding PC, workability can be secured to 10 h. 3. The bound water ratio and compressive strength in aging 3 days occupy $70sim80%$ of those in aging 28 days, and the early compressive strength increases not only by adding KCl, but also by chemical admixture. 4. Although compressive strength development is excellent in NS, PC, if NS is added excessively, hydration becomes slow and while the pore structures become slightly minute, the strength development decreases due to severe setting retardation. |
| Key words:
KCl, Chemical admixture, Fluidity, Bond water ratio, Strength development |
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