Session Details
MS01-2: 3D Imaging and Segmentation Methods for Computational Modeling of Heterogeneous Materials (Ganzes Minisymposium anzeigen)
Wednesday, 11. October 2017; 16:00 - 18:00 Uhr in Raum 7.12
Sitzungsleitung: Michele Griffa
16:00
Application of X-ray computed tomography on fracture behaviour study of cement paste at micro-scale
Hongzhi Zhang (Delft University of Technology), Branko Šavija (Delft University of Technology), Erik Schlangen (Delft University of Technology)
Kurzfassung:
3D microstructure with a cubic dimension of 100 $\mu \mathrm{m}^3$ was generated by X-ray computed tomography. Its mechanical properties were predicted by the microstructure informed lattice model. Considering the heterogeneous nature of this material, 30 specimens were investigated. Correlation analysis was conducted between the simulated mechanical properties and porosity.
Application of X-ray computed tomography on fracture behaviour study of cement paste at micro-scale
Hongzhi Zhang (Delft University of Technology), Branko Šavija (Delft University of Technology), Erik Schlangen (Delft University of Technology)
Kurzfassung:
3D microstructure with a cubic dimension of 100 $\mu \mathrm{m}^3$ was generated by X-ray computed tomography. Its mechanical properties were predicted by the microstructure informed lattice model. Considering the heterogeneous nature of this material, 30 specimens were investigated. Correlation analysis was conducted between the simulated mechanical properties and porosity.
16:20
In situ cement hydration in levitated droplets
Julia Stroh (Federal Institute for Materials Research and Testing), Franziska Emmerling (Federal Institute for Materials Research and Testing)
Kurzfassung:
Building materials consist of cement, water and chemical admixtures, which adjust cement paste properties. Admixtures can act beyond their aimed functions causing undesirable side effects on the hydration course and the properties of the resulting building material. The mechanisms of these effects are still under investigation. We investigate cement hydration in levitated droplets using an ultrasonic levitator. The hydrate phase formation is followed in situ by synchrotron XRD. The data allows detailed conclusions about the mechanisms of the admixture action in the ongoing hydration reactions.
In situ cement hydration in levitated droplets
Julia Stroh (Federal Institute for Materials Research and Testing), Franziska Emmerling (Federal Institute for Materials Research and Testing)
Kurzfassung:
Building materials consist of cement, water and chemical admixtures, which adjust cement paste properties. Admixtures can act beyond their aimed functions causing undesirable side effects on the hydration course and the properties of the resulting building material. The mechanisms of these effects are still under investigation. We investigate cement hydration in levitated droplets using an ultrasonic levitator. The hydrate phase formation is followed in situ by synchrotron XRD. The data allows detailed conclusions about the mechanisms of the admixture action in the ongoing hydration reactions.
16:40
High energy microtomography using synchrotron radiation for materials science application
Felix Beckmann (Helmholtz-Zentrum Geesthacht)
Kurzfassung:
The Helmholtz-Zentrum Geesthacht, Germany, is operating the user experiments for microtomography at the beamlines P05 and P07 using synchrotron radiation produced in the storage ring PETRA III at DESY, Hamburg, Germany. Attenuation contrast and phase contrast techniques were established to provide an imaging tool for materials science applications. In this talk the current status of the grating-based phase contrast and the concept for the investigation of large samples will be presented.
High energy microtomography using synchrotron radiation for materials science application
Felix Beckmann (Helmholtz-Zentrum Geesthacht)
Kurzfassung:
The Helmholtz-Zentrum Geesthacht, Germany, is operating the user experiments for microtomography at the beamlines P05 and P07 using synchrotron radiation produced in the storage ring PETRA III at DESY, Hamburg, Germany. Attenuation contrast and phase contrast techniques were established to provide an imaging tool for materials science applications. In this talk the current status of the grating-based phase contrast and the concept for the investigation of large samples will be presented.
17:00
X-ray computed tomography: Image processing and applications
Matteo Lunardelli (Technical University of Braunschweig), Patrick Varady (Technical University of Braunschweig), Dennis Köhnke (Technical University of Braunschweig), Sven Lehmberg (Technical University of Braunschweig), Harald Budelmann (Technical University of Braunschweig)
Kurzfassung:
Understanding the mechanical behavior and deterioration processes of inhomogeneous cement based materials such as mortar and concrete can be improved with information on their inner structure obtained in non-destructive x-ray CT scans. However, the different concrete components have similar attenuation coefficients, resulting in low contrasts between them. It requires demanding image processing techniques, of which a selection will be presented in relation to their applications.
X-ray computed tomography: Image processing and applications
Matteo Lunardelli (Technical University of Braunschweig), Patrick Varady (Technical University of Braunschweig), Dennis Köhnke (Technical University of Braunschweig), Sven Lehmberg (Technical University of Braunschweig), Harald Budelmann (Technical University of Braunschweig)
Kurzfassung:
Understanding the mechanical behavior and deterioration processes of inhomogeneous cement based materials such as mortar and concrete can be improved with information on their inner structure obtained in non-destructive x-ray CT scans. However, the different concrete components have similar attenuation coefficients, resulting in low contrasts between them. It requires demanding image processing techniques, of which a selection will be presented in relation to their applications.
17:20
Efficient mesh generation of real concrete mesostructures from CT scan images using contrast enhancers
Pietro Carrara (Technical University of Braunschweig), Roland Kruse (Technical University of Braunschweig), Laura De Lorenzis (Technical University of Braunschweig)
Kurzfassung:
This work explores the possibility to add contrast enhancers powders into the concrete mixes to allow an easier segmentation and mesh generation. This allows to adopt high fidelity geometries of the concrete mesostructure into numerical simulations. Characterization tests are performed in order to ensure that the concrete mix is not appreciably affected by the presence of the enhancers. The results of both normal and modified concretes are compared to demonstrate the validity of the method.
Efficient mesh generation of real concrete mesostructures from CT scan images using contrast enhancers
Pietro Carrara (Technical University of Braunschweig), Roland Kruse (Technical University of Braunschweig), Laura De Lorenzis (Technical University of Braunschweig)
Kurzfassung:
This work explores the possibility to add contrast enhancers powders into the concrete mixes to allow an easier segmentation and mesh generation. This allows to adopt high fidelity geometries of the concrete mesostructure into numerical simulations. Characterization tests are performed in order to ensure that the concrete mix is not appreciably affected by the presence of the enhancers. The results of both normal and modified concretes are compared to demonstrate the validity of the method.
17:40
X-ray imaging of water transport in porous materials: New possibilities by phase and dark-field contrast
Michele Griffa (Swiss Federal Laboratories for Materials Science and Technology, EMPA), Fei Yang (ETH Zürich)
Kurzfassung:
In this contribution, we show examples of X-ray phase and dark-field contrast X-ray imaging, based on refraction and ultra-small angle scattering of the transmitted X-ray photons, respectively, as applied to cement-based materials during changes in their water content due to distinct processes. We overview what can be gained by using such imaging methods compared with what achievable with standard, attenuation contrast ones.
X-ray imaging of water transport in porous materials: New possibilities by phase and dark-field contrast
Michele Griffa (Swiss Federal Laboratories for Materials Science and Technology, EMPA), Fei Yang (ETH Zürich)
Kurzfassung:
In this contribution, we show examples of X-ray phase and dark-field contrast X-ray imaging, based on refraction and ultra-small angle scattering of the transmitted X-ray photons, respectively, as applied to cement-based materials during changes in their water content due to distinct processes. We overview what can be gained by using such imaging methods compared with what achievable with standard, attenuation contrast ones.