The role of graphene/graphene oxide in cement hydration
The role of graphene/graphene oxide in cement hydration
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DOI：
10.1515/ntrev-2021-0055
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发表时间：
2021-01
影响因子：
7.4
通讯作者：
Shaoqiang Meng;Xiaowei Ouyang;Jiyang Fu;Yanfei Niu;Yuwei Ma
中科院分区：
文献类型：
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作者：
Shaoqiang Meng;Xiaowei Ouyang;Jiyang Fu;Yanfei Niu;Yuwei Ma
摘要石墨烯(G)和氧化石墨烯(GO)能显著改善水泥基材料的力学性能。本文研究了G/GO对水泥水化的影响。首先，测定了G/GO在模拟溶液中的Zeta电位，并探讨了G/GO表面与钙离子的相互作用。随后，用扫描电子显微镜观察了含G/GO水泥浆体中C-S-H在水泥表面成核生长的形态。此外，对样品的水化产物进行了X射线衍射和热重分析。最后，用等温量热法研究了G/GO对水泥早期水化的影响。结果表明，G/GO的加入显著促进了C-S-H在水泥表面的成核和生长。结果表明，水泥浆体中G/GO生成的高活度离子是水泥水化加速的主要原因。G的存在，尤其是GO的存在，促进了离子尤其是钙离子的迁移，从而增强了水泥表面与离子之间的相互作用。这种强烈的相互作用促进了C-S-H的成核和生长，从而促进了水泥的水化。图形摘要(1)GO与钙离子有很强的相互作用。(2)G/GO促进C-S-H生长。(3)G/GO产生的高迁移率离子有利于水化。
Abstract Graphene (G) and graphene oxide (GO) have been shown to significantly improve the mechanical properties of cement-based materials. In this study, the effect of the G/GO on cement hydration was investigated. First, the zeta potential of G/GO in simulated solutions was tested, and the interaction between G/GO’s surface and Ca2+ was explored. Subsequently, scanning electron microscopy was used to observe the morphology of C–S–H nucleation and growth on the cement surface in the cement paste containing G/GO. Furthermore, XRD and TGA analyses were carried out on the hydration products of the sample. At last, isothermal calorimetry was applied to investigate the influence of G/GO on the early hydration of cement. The results showed that the addition of G/GO significantly accelerates C–S–H nucleation and growth on the cement surface. It is indicated that the high mobility ions derived by G/GO in the cement paste dominate the reason for the accelerated hydration of cement. The presence of G, especially GO, facilitates the mobility of ions, especially Ca2+, thus enhances the interaction between the cement surface and the ions. This strong interaction promotes the C–S–H nucleation and growth, and therefore, the hydration of the cement. Graphical abstract (1) GO has a strong interaction with Ca2+. (2) G/GO accelerates C–S–H growth. (3) High mobility ions derived by G/GO facilitate hydration.