This study demonstrates the application and combination of multiple imaging techniques (Light Microscopy, Micro X-ray Computer Tomography (μ-CT), Scanning Electron Microscopy (SEM) and Focussed Ion Beam - Nano Tomography (FIB-nT)) to the analysis of the microstructure of hydrated alite across multiple scales. However, by comparing findings with mercury intrusion porosimetry (MIP) it becomes obvious, that the imaged 3D-volumes and 2D-images do not sufficiently overlap at certain scales to allow a continuous quantification of the pore size distribution (PSD). This can be overcome by improving the resolution and increasing the measured volume. Furthermore, results show that the fibrous morphology of Calcium-Silicate-Hydrates (C-S-H) phases is preserved during FIB-nT. This is a requirement for characterisation of nanoscale porosity. Finally, it was proven that the combination of FIB-nT with Energy-Dispersive X-ray Spectroscopy (EDX) data facilitates the phase segmentation of a 11×11×7.7 μm3 volume of hydrated alite.

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