Uniformly Dispersed and Re-Agglomerated Graphene Oxide-Based Cement Pastes: A Comparison of Rheological Properties, Mechanical Properties and Microstructure.
Uniformly Dispersed and Re-Agglomerated Graphene Oxide-Based Cement Pastes: A Comparison of Rheological Properties, Mechanical Properties and Microstructure.
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均匀分散和再团聚的氧化石墨烯基水泥浆体：流变性能、力学性能和微观结构的比较
DOI：
10.3390/nano8010031
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发表时间：
2018-01-09
期刊：
影响因子：
--
通讯作者：
Xing F
中科院分区：
文献类型：
--
作者：
Long WJ;Li HD;Fang CL;Xing F
氧化石墨烯（GO）基水泥浆体的性能会受到GO分散状态的显着影响。本研究系统研究了均匀分散和再团聚的GO对水泥浆体流变、力学性能和微观结构的影响。通过改变混合顺序可以实现两种不同的分散状态：聚羧酸醚（PCE）与GO-水泥混合或水泥与GO-PCE混合。实验结果表明，与重新团聚的 GO 水泥浆体相比，均匀分散的 GO 的屈服应力和塑性粘度有所增加。此外，均匀分散的 GO 浆料的 3 天抗压强度和弯曲强度分别比重新团聚的 GO 浆料高 8% 和 27%。 X射线衍射、傅里叶变换红外光谱和扫描电镜分析结果表明，均匀分散的GO更有效地促进硬化水泥浆体水化产物的形成。此外，使用压汞孔隙率分析法进行的孔隙率分析表明，与重新团聚的GO相比，均匀分散的GO可以更好地抑制大尺寸孔隙的形成，并在第3天和第7天优化孔径分布。
The properties of graphene oxide (GO)-based cement paste can be significantly affected by the state of GO dispersion. In this study, the effects of uniformly dispersed and re-agglomerated GO on the rheological, mechanical properties and microstructure of cement paste were systematically investigated. Two distinct dispersion states can be achieved by altering the mixing sequence: Polycarboxylate-ether (PCE) mixed with GO-cement or cement mixed with GO-PCE. The experimental results showed that the yield stress and plastic viscosity increased with the uniformly dispersed GO when compared to those of re-agglomerated GO cement paste. Moreover, the 3-day compressive and flexural strengths of uniformly dispersed GO paste were 8% and 27%, respectively, higher than those of re-agglomerated GO pastes. The results of X-ray diffraction, Fourier transform infrared spectroscopy and scanning electron microscopy analyses demonstrated that uniformly dispersed GO more effectively promotes the formation of hydration products in hardened cement paste. Furthermore, a porosity analysis using mercury intrusion porosimetry revealed that the homogeneous dispersion of GO can better inhibit the formation of large-size pores and optimize the pore size distribution at 3 and 7 days than the re-agglomerated GO.
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