TY  - JOUR
A1  - Jiang, Mingze
A1  - Rößler, Christiane
A1  - Wellmann, Eva
A1  - Klaver, Jop
A1  - Kleiner, Florian
A1  - Schmatz, Joyce
T1  - Workflow for high-resolution phase segmentation of cement clinker fromcombined BSE image and EDX spectral data
JF  - Journal of Microscopy
N2  - Burning of clinker is the most influencing step of cement quality during the production process. Appropriate characterisation for quality control and decision-making is therefore the critical point to maintain a stable production but also for the development of alternative cements. Scanning electron microscopy (SEM) in combination with energy dispersive X-ray spectroscopy (EDX) delivers spatially resolved phase and chemical information for cement clinker. This data can be used to quantify phase fractions and chemical composition of identified phases.

The contribution aims to provide an overview of phase fraction quantification by semi-automatic phase segmentation using high-resolution backscattered electron (BSE) images and lower-resolved EDX element maps. Therefore, a tool for image analysis was developed that uses state-of-the-art algorithms for pixel-wise image segmentation and labelling in combination with a decision tree that allows searching for specific clinker phases. Results show that this tool can be applied to segment sub-micron scale clinker phases and to get a quantification of all phase fractions. In addition, statistical evaluation of the data is implemented within the tool to reveal whether the imaged area is representative for all clinker phases.
KW  - Zementklinker
KW  - Bildsegmentierung
KW  - Rasterelektronenmikroskopie
KW  - cement clinker
KW  - image segmentation
KW  - EDX
KW  - superpixel
Y1  - 2021
U6  - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:gbv:wim2-20211215-45449
UR  - https://onlinelibrary.wiley.com/doi/epdf/10.1111/jmi.13072
VL  - 2021
SP  - 1
EP  - 7
PB  - Wiley-Blackwell
CY  - Oxford
ER  - 
TY  - JOUR
A1  - Kleiner, Florian
A1  - Rößler, Christiane
A1  - Vogt, Franziska
A1  - Osburg, Andrea
A1  - Ludwig, Horst-Michael
T1  - Reconstruction of calcium silicate hydrates using multiple 2D and 3D imaging techniques: Light microscopy, μ-CT, SEM, FIB-nT combined with EDX
JF  - Journal of Microscopy
N2  - 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 nano-scale 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.
KW  - Zementklinker
KW  - Bildsegmentierung
KW  - Rasterelektronenmikroskopie
KW  - Computertomographie
KW  - tomography
KW  - focussed ion beam
KW  - cement microstructure
KW  - micro-CT
Y1  - 2021
U6  - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:gbv:wim2-20220106-45458
UR  - https://onlinelibrary.wiley.com/doi/10.1111/jmi.13081
VL  - 2021
SP  - 1
EP  - 6
PB  - John Wiley & Sons Ltd
CY  - Oxford
ER  -