Micro-mechanical properties and multi-scaled pore structure of graphene oxide cement paste: Synergistic application of nanoindentation, X-ray computed tomography, and SEM-EDS analysis

作者：Long, Wu-Jian^*; Gu, Yu-cun; Xiao, Bing-Xu; Zhang, Qi-ming; Xing, Feng

来源：Construction and Building Materials, 2018, 179(Aug.10): 661-674.

DOI：10.1016/j.conbuildmat.2018.05.229

• Graphene oxide
• Microstructure
• Nanoindentation
• Micro-mechanical properties
• X-ray computed tomography
• Pores

In this study, the microstructure and micromechanical properties of graphene oxide (GO) cement-based materials are investigated. Nanoindentation with statistical deconvolution was used to determine the elastic properties of constituent phases. Besides, combined with scanning electron microscopy (SEM) equipped with energy-dispersive spectrometer (EDS) and backscattered electrons (BSE), each phase of hardened cement paste was identified and quantified as well. X-ray computed tomography (XCT) microscope was applied to determine the morphology of micrometer-size pores, while mercury intrusion porosimetry (MIP) was used to capture the volume fraction of smaller pores (nano-scale). The combined use of XCT and MIP offered an effective approach for further understanding the effect of GO on pore structure at multi-scale. The synergistic analysis of microstructure and micromechanical properties at multi-scale provides valuable information towards the material design of cement-based materials with nanomaterials.

• 出版日期2018-8-10
• 单位深圳大学