微交联降粘型聚羧酸减水剂的合成及其在低水胶比体系中的作用

doi:10.11896/cldb.20090167

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Abstract Asuperplasticizer was synthesized by isobutyl alcohol polyoxyethylene ether, acrylic acid, maleic anhydride, 2-(dimethylamino)ethyl methacrylate, unsaturated ester, crosslinking agent and potassium persulfate according to the molecular structure design principle. The molecular structure of superplasticizer was determined by Fourier infrared spectroscopy,¹H nuclear magnetic resonance, gel permeation chromatography and dynamic light scattering, respectively. The surface tension, dispersion performance, Marsh time, rheological behavior, water film thickness, adsorption behavior and application performance of fresh concrete of comb-type and micro-crosslinked superplasticizer were comparatively stu-died. Compared with the dosage and Marsh time of PCE-1, those of WJN were reduced by more than 20% and 40%, with the yield stress of the cement paste and the shear viscosity reduced by 45% and 50%, respectively, at the water-binder ratio (w/c) of 0.20 under the same fluidity. The concrete results show that the dosage, slump time and T500 were reduced by more than 10%, 65% and 55%, respectively. Therefore, the superplasticizer of branched structure has good viscosity-reducing effect.

Key words： pore solution viscosity viscosity-reducing polycarboxylate superplasticizer water film thickness dispersion performance rheological behavior

Published: 10 May 2022 Online: 2022-05-09

CLC number:

TU528.042

Fund:National Natural Science Foundation of China (51878102), the National Key Research and Development Plan of the Thirteenth(2017YFB0309905) and the Natural Science Foundation of Chongqing(cstc2018jcyjAX0403).

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	Articles by authors
	CHEN Jing
	YANG Changhui
	GAO Yuxin
	YANG Wen
	WANG Futao
	LIU Ming
	ZENG Chao

Cite this article:

CHEN Jing,YANG Changhui,GAO Yuxin, et al. Synthesis of Slightly Cross-linked Viscosity-reducing Polycarboxylate Superplasticizer and Its Influence on Cement Paste with Low Water-Binder Ratio[J]. Materials Reports, 2022, 36(9): 20090167-8.

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http://www.mater-rep.com/EN/10.11896/cldb.20090167 OR http://www.mater-rep.com/EN/Y2022/V36/I9/20090167

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