没食子酸协同聚羧酸减水剂分散氧化石墨烯及其对水泥砂浆性能的影响

doi:10.11896/cldb.20040258

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Abstract Asmall amount of graphene oxide (GO) could greatly improve the strength and toughness of cement composites. However, GO was easy to accumulate and precipitate in the environment of high calcium and alkali, so the stability of GO dispersion is the key to obtain high-perfor-mance cement-based materials. In this study, the effect of GA on the dispersion of GO in the saturated CH solution and mechanical properties of hardened cement composite were studied. Compared with PC dispersing system, the addition of a certain content of GA could further improve the dispersing ability of GO in CH solution and subsequently enhanced the flexural and compressive strength of cement mortar in 3 d by 17.3% and 18%, and in 28 d by 19.2% and 21.4%, respectively. The synergistic effect of GA and PC on the GO dispersion could obviously accelerate cement hydration process and uniform growth of the crystal of cement hydration products, which made the microstructure of hardened cement stone more compact. Herein,as a green and inexpensive reagent, GA was choosen as a co-dispersant to provide a new alternative to GO reinforcing cement-based materials and had many potential applications.

Key words： graphene oxide gallic acid synergistic dispersion microstructure

Published: 04 June 2021

CLC number:

TU528.572

Fund:National Natural Science Foundation of China (51402030), Natural Science Foundation of Chongqing Science and Technology Commission (cstc2017jcyjBX0028) and Technology Research Program of Chongqing Municipal Education Commission (KJZD-K201800703).

About author:: Xiaoya Yuan received his Ph. D. in macromolecular chemistry and physics in 2006 from Nankai University and joined Chongqing Jiaotong University (CQJTU) in July of this year. Starting from 2013, he is a full-time professor of materials science and engineering at CQJTU. He has published more than 50 papers, among which over 30 SCI or EI are indexed. His research inte-rest includes nanocomposites, functional building and construction materials, high-performance concrete-based materials. As the principle investigator, Prof. Yuan have over 10 national and municipal-level projects and 6 Chinese patents of invention. He won 2 provincial-level awards.
Zhiqiang Wei is now a graduate student under the su-pervision of Professor Xiaoya Yuan at School of Civil Engineering of Chongqing Jiaotong University. His research is focused on the research of graphene-mixed cement-based composites.

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	WEI Zhiqiang
	WANG Yuangui
	QI Meng
	ZHENG Xuxu
	YUAN Xiaoya

Cite this article:

WEI Zhiqiang,WANG Yuangui,QI Meng, et al. The Synergistic Effect of Gallic Acid and Polycarboxylic Water-reducer on Aqueous GO Dispersion and the Enhanced Mechanical Properties of Cement Mortar Composites[J]. Materials Reports, 2021, 35(10): 10042-10047.

URL:

http://www.mater-rep.com/EN/10.11896/cldb.20040258 OR http://www.mater-rep.com/EN/Y2021/V35/I10/10042

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