Graphene (Gr) and Graphene Oxide (GO) are graphene-based nanosheet (GNS) materials with ultrahigh mechanical properties. The addition of Gr/GO (from 0.01 % to 2 % in mass) to a cement-based material can significantly enhance its mechanical properties. GO has higher efficiency than Gr, but it is more costly. In this paper, a Gr-GO solution was developed by combining Gr and GO in water. The compressive strengths of the samples with and without Gr-GO were determined. Deep analyses were performed by applying several imaging techniques such as nano-tomography, SEM, and confocal Raman imaging to exploit the correlation between microstructural properties and mechanical properties and durability of cement-based materials. The microstructural properties were also quantified from the 3D images obtained by nano-tomography. The results showed that the GNS-added sample had a higher porosity (about 12.4 %) than that of the reference sample (about 6.1 %) but the GNS-added sample had a more homogeneous distribution of micropores. Raman imaging results explained the formation of hydration product and acceleration of hydration rate by Gr-GO in GNS-added samples. The mechanical properties showed that the addition of 0.03 % Gr-GO could increase the compressive strength of mortar samples by 28 %.

中文翻译：

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评估石墨烯和氧化石墨烯纳米片在水泥基材料中的结合


石墨烯 （Gr） 和氧化石墨烯 （GO） 是具有超高机械性能的石墨烯基纳米片 （GNS） 材料。向水泥基材料中添加 Gr/GO（质量从 0.01 % 到 2 %）可以显著提高其机械性能。GO 的效率高于 Gr，但成本更高。在本文中，通过将 Gr 和 GO 结合在水中开发了一种 Gr-GO 解决方案。测定含和不含 Gr-GO 的样品的抗压强度。通过应用纳米断层扫描、SEM 和共聚焦拉曼成像等多种成像技术进行深度分析，以利用微结构特性与水泥基材料的机械性能和耐久性之间的相关性。微观结构特性也从纳米断层扫描获得的 3D 图像中量化。结果表明，添加 GNS 的样品具有更高的孔隙率（约 12.4 %），但添加 GNS 的样品具有更均匀的微孔分布。拉曼成像结果解释了 GNS 添加样品中 Gr-GO 水合产物的形成和水合速率的加速。力学性能表明，添加 0.03 % Gr-GO 可使砂浆样品的抗压强度提高 28 %。