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Received February 27, 2008
Accepted May 10, 2008
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Effects of polycarboxylate-type superplasticizer on fluidity and hydration behavior of cement paste
Reliability Assessment Center, Korea Institute of Construction Materials, Seosan 356-874, Korea 1Korea Research Institute of Chemical Technology, Deajeon 305-600, Korea 2Dep. of Fine Chemical Engineering & Chemistry, Chungnam National University, Deajeon 305-764, Korea
jshong@krict.re.kr
Korean Journal of Chemical Engineering, November 2008, 25(6), 1553-1561(9), 10.1007/s11814-008-0255-3
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Abstract
Polycarboxylate (PC)-type superplasticizers were synthesized with different average molecular weight of polyethylene oxide (PEO) graft groups, the molar ratios of graft group to carboxylic group, and then the chemical structure, polymerization condition, and physical and chemical properties were analyzed. In order to evaluate the effects of PC-type superplasticizers in cement paste, the adsorption, the initial plasticity and slump retention characteristics and the degree of hydration reaction were investigated. As the average molecular weight of graft group decreased and molar ratio increased, the conversion rate to copolymers, the adsorption amount of PC-type superplasticizer on cement particles improved; on the other hand, the hydration reaction was delayed.
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Kinoshita M, Yonezawa T, Yuki Y, Semento, Konkurito Ronbunshu, 47, 196 (1993)
Cho HY, Suh JM, Cement and Concrete Research, 35, 891 (2005)
Papayianni I, Tsohos G, Oikonomou N, Mavria P, Cement and Concrete Composites, 27, 217 (2005)
Tseng YC, Wu WL, Huang L, Wang CT, Hsu KC, Superplasticizers and other chemical admixtures in concrete SP-195, 401 (2000)
Golaszewski J, Szwabowski J, Cement and Concrete Research, 34, 235 (2004)
Kantro DL, Cement Concrete Aggregate, 2, 56 (1980)
Odian G, Principles of polymerization, Wiley Interscience, 34-39 (2004)
March J, Advanced organic chemistry, John Wiley & Sons, Inc., New York, 667-689 (1992)
Yamada K, Ogawa S, Hanehara S, Cement and Concrete Research, 31, 375 (2001)
Yamada K, Takahashi T, Hanehara S, Matsuhisa M, Cement and Concrete Research, 30, 197 (2000)
Yoshio T, Chemical structure and dispersion mechanism of air entraining high-range water reducing agents, NMB Research Transactions 9, 5-11 (1992)
Shaw DJ, Introduction to colloid and surface chemistry, Butterworth-Heinemann, London, 174-209 (1992)
Taylor HFW, Cement chemistry, Academic Press, London, 128-133 (1990)
Park SS, Kang HY, Korean J. Chem. Eng., 23(3), 367 (2006)
