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[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()
聚羧酸减水剂对水泥浆体早期单碳铝酸钙形成的影响
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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
聚羧酸减水剂对水泥浆体早期单碳铝酸钙形成的影响
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
蒋亚清1, 张思佳1, 2, 刘小艳1, D. Damidot2
1河海大学力学与材料学院, 南京210098; 2Civil and Environmental Engineering Department, École des Mines de Douai, Douai 59500, France
Keywords:
cement;  high-range water reducer;  limestone;  ettringite;  calcium monocarboaluminate hydrate
水泥;  高效减水剂;  石灰石;  钙矾石;  单碳型水化碳铝酸钙
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.
利用傅里叶红外光谱(FTIR)、扫描电子显微镜(SEM)、热重分析(DTG)和等温吸附, 研究了含石灰石填料(LF)水泥在掺用聚羧酸减水剂(PCA)时, 硬化浆体中单碳型水化碳铝酸钙(AFmc)的形成规律.研究发现, 水泥在水化15 min的初始期就形成了AFmc, PCA通过促进早期C4AF水化使含铁的AFmc更易形成.以萘磺酸盐缩合物减水剂取代PCA时, 未观察到相同现象.由于浆体中AFmc和钙矾石(AFt)的共存, 减少了水泥矿物对PCA的吸附量, 从而改善了PCA与水泥的适应性.因此, 当混凝土中掺用LF时, PCA应作为首选的高效减水剂.

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.
Last Update: 2010-12-20