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http://dx.doi.org/10.4191/KCERS.2007.44.1.023

Effects of Chemical Admixture on the Paste Fluidity and Mortar Strength Development of High Chloride Cement  

Jeong, Chan-Il (Department of Materials Science and Engineering, Myongji University)
Park, Soo-Kyung (Department of Materials Science and Engineering, Myongji University)
Lee, Eui-Hak (Department of Materials Science and Engineering, Myongji University)
Lee, Kyung-Hee (Department of Materials Science and Engineering, Myongji University)
Publication Information
Journal of the Korean Ceramic Society / v.44, no.1, 2007 , pp. 23-31 More about this Journal
Abstract
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 $70\sim80%$ 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.
Keywords
KCl; Chemical admixture; Fluidity; Bond water ratio; Strength development;
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