[1] Jiang Yaqing, Zhang Sijia, Liu Xiaoyan, et al. Early calcium monocarboaluminate hydrate formation in cementpaste: effect of polycarboxylate type admixture [J]. Journal of Southeast University (English Edition), 2010, 26 (4): 574-577. [doi:10.3969/j.issn.1003-7985.2010.04.015]

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Early calcium monocarboaluminate hydrate formation in cementpaste: effect of polycarboxylate type admixture()

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Journal of Southeast University (English Edition)[ISSN:1003-7985/CN:32-1325/N]

Volumn:

26

Issue:

2010 4

Page:

574-577

Research Field:

Traffic and Transportation Engineering

Publishing date:

2010-12-30

Info

Title:

Early calcium monocarboaluminate hydrate formation in cementpaste: effect of polycarboxylate type admixture

Author(s):

Jiang Yaqing¹;  Zhang Sijia¹;  2;  Liu Xiaoyan¹;  D.Damidot²

¹School of Mechanics and Materials Science, Hohai University, Nanjing 210098, China
²Civil and Environmental Engineering Department, École des Mines de Douai, Douai 59500, France

Keywords:

cement;  high-range water reducer;  limestone;  ettringite;  calcium monocarboaluminate hydrate

PACS:

U528

DOI:

10.3969/j.issn.1003-7985.2010.04.015

Abstract:

Effects of polycarboxylate type admixture(PCA)on calcium monocarboaluminate hydrate(AFmc)formation in hydrated cement paste containing limestone filler(LF)are investigated by the Fourier transform infrared spectroscopy(FTIR), the scanning electron microscopy(SEM), the derivative thermogravimetric(DTG)analysis and the adsorption amount measurement. Experimental results indicate that AFmc forms during the initial hydration period of cement as early as 15 min. It is found that PCA accelerates the early age AFmc formation and enhances cement hydration by promoting C₄AF hydration at the early age, and, as a consequence, the iron associated AFmc phase forms more readily. The phenomenon is not observed when PCA is replaced by a naphthalene formaldehyde sulphonate condensate water reducer. Compatibility between PCA and cement is modified due to the presence of AFmc along with ettringite(AFt), which results in a less adsorption amount of PCA on the surface of cement minerals. As a kind of high-range water reducer, PCA may be the preferred choice for concrete containing LF.

References:

[1] Damtoft J S, Lukasik J, Herfort D, et al. Sustainable development and climate change initiatives [J]. Cem Concr Res, 2008, 38(2): 115-127.
[2] Scrivener K L, Kirkpatrick R J. Innovation in use and research on cementitious material [J]. Cem Concr Res, 2008, 38(2): 128-136.
[3] Hanehara S, Yamada K. Rheology and early age properties of cement systems [J]. Cem Concr Res, 2008, 38(2): 175-195.
[4] Lothenbach B, Saout G L, Gallucci E. Influence of limestone on the hydration of Portland cements [J]. Cem Concr Res, 2008, 38(6): 848-860.
[5] Bentz D P. Modeling the influence of limestone filler on cement hydration using CEMHYD3D [J]. Cem Concr Comp, 2006, 28(2):124-129.
[6] Zingg A, Winnefeld F, Holzer L, et al. Interaction of polycarboxylate-based superplasticizers with cements containing different C₃A amounts [J]. Cem Concr Comp, 2009, 31(3): 153-162.
[7] Jiang Y Q, Gong M Z. Effect of superplasticizer type on early age hydration of cement [C]//Proceedings of the First International Conference on Microstructure Related Durability of Cementitious Composites. Paris, France, 2008, 1: 153-160.
[8] Plank J, Hirsch C. Impact of zeta potential of early cement hydration phases on superplasticizer adsorption [J]. Cem Concr Res, 2007, 37(4): 537-542.

Memo

Memo:

Biography: Jiang Yaqing(1963—), male, doctor, professor, yqjiang@hhu.edu.cn.
Foundation items: The Natural Science Foundation of Jiangsu Province(No.BK2009712), the National Construction Research Project(No.2009-K4-9).
Citation: Jiang Yaqing, Zhang Sijia, Liu Xiaoyan, et al. Early calcium monocarboaluminate hydrate formation in cement paste: effect of polycarboxylate type admixture[J].Journal of Southeast University(English Edition), 2010, 26(4):574-577.

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