热还原氧化石墨烯在水泥水化介质中的分散及其增强砂浆的性能与机理研究

doi:10.11896/cldb.19030102

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Abstract Graphene nanosheets can greatly improve the properties of cement-based materials, but how to improve the dispersion of graphene nano-sheets in calcium and alkaline-abundant cement hydration environment is a key problem. In this study, a polyaromatic water reducer (JS) was used as a dispersant to study the dispersion of reduced graphene oxide (rGO) prepared by high temperature thermal reduction in saturated calcium hydroxide (CH) solution used to simulate hydrated cement system rich in calcium and alkaline environment. The study showed that when the mass ratio of JS to cement was 1.5%, rGO could be well-dispersed in CH solution. The mechanical test of graphene-mixed cement mortar showed that when the mass content of rGO to cement was 0.05%, the 3 d flexural and compressive strength were increased by 9.5% and 11.1%, respectively and the 28 d flexural and compressive strength were increased by 6.74% and 26.5% respectively. The chemical bonded water and microscopic tests showed that JS could effectively disperse rGO in hardened cement motar, accelerate the hydration process of cement paste and regulate the crystal growth of hydrated products.

Key words： cement hydration dispersant graphene cement mortar mechanical performance microstructure

Published: 12 March 2020

CLC number:

O319.56

Fund:This work was financially supported by the National Natural Science Foundation of China (51402030); Natural Science Foundation of Chongqing Scienceand Technology Commission (cstc2017jcyjBX0028) and Science and Technology Research Program of Chongqing Municipal Education Commission (KJZD-K201800703).

About author:: Xiaoya Yuanreceived 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 interest 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 wins 2 provincial-level awards; Yihao Pengis now a graduate student under the supervision of Professor Xiaoya Yuan at Chongqing Jiaotong University. His research is focused on the research of graphene-mixed cement-based composites.

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	YUAN Xiaoya
	PENG Yihao
	SUN Litao
	ZHENG Xuxu
	QIN Zehai

Cite this article:

YUAN Xiaoya,PENG Yihao,SUN Litao, et al. Dispersion of Thermally Reduced Graphene Oxide in Simulated Hydrated Cement Environment and Study on Performance and Mechanism of Graphene Reinforced Mortar[J]. Materials Reports, 2020, 34(6): 6075-6080.

URL:

http://www.mater-rep.com/EN/10.11896/cldb.19030102 OR http://www.mater-rep.com/EN/Y2020/V34/I6/6075

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