Abstract The pore structure of a mature industrial High Performance Concrete (HPC) is characterized at the scale of its cement hydrates with 3D Focused Ion Beam/Scanning Electron Microscopy (FIB/SEM). The considered scale is a mesoscale, with sample volumes of 61–118 μm3, and voxel sizes of 5.9 × 7.5 × 10 nm3 (or 5.9 × 7.5 × 20 nm3). Four independent samples are imaged deliberately in the cement hydrates for minimal evaluation of pore structure fluctuations. The investigated pore sizes range between 10 and 600 nm. Katz-Thompson model derived from percolation theory, coupled to pore structure data from FIB/SEM, predict fluid transport properties in the Darcy's sense. Upscaled predictions at the mesoscale of the cement hydrates are on the same order of magnitude as experimental permeability at the pluri-centimetric scale (i.e. a macroscale for the HPC). This means that the pore network of the cement hydrates, imaged by FIB/SEM, has a relevant contribution to fluid transport through the HPC.

中文翻译：

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高性能混凝土中水泥水合物的孔隙网络，通过 3D FIB/SEM — 对宏观流体传输的影响

摘要 利用 3D 聚焦离子束/扫描电子显微镜 (FIB/SEM) 在水泥水合物的尺度上表征成熟的工业高性能混凝土 (HPC) 的孔隙结构。考虑的尺度是中尺度，样本体积为 61–118 μm3，体素尺寸为 5.9 × 7.5 × 10 nm3（或 5.9 × 7.5 × 20 nm3）。四个独立的样品在水泥水合物中刻意成像，以最小化孔隙结构波动的评估。研究的孔径范围在 10 到 600 nm 之间。源自渗流理论的 Katz-Thompson 模型与来自 FIB/SEM 的孔隙结构数据相结合，可以预测达西意义上的流体传输特性。水泥水合物中尺度的放大预测与多厘米尺度的实验渗透率处于同一数量级（即 HPC 的宏观尺度）。这意味着通过 FIB/SEM 成像的水泥水合物的孔隙网络对通过 HPC 的流体传输有相关贡献​​。