Public disputation of the dissertation of Dipl.-Ing. Josiane Giese
Topic of the thesis: Stability sensitivity of thin-walled structures made of carbon reinforced concrete
Doctoral committee: Chairperson: Prof. Dr. Katharina Kleinschrot, (Technische Universität Dresden)
Reviewer:
Prof. Dr. Manfred Curbach (Technische Universität Dresden) Prof. Dr. Rostislav Chudoba (RWTH Aachen University) Prof. Dr. Konrad Bergmeister (University of Natural Resources and Life Sciences, Vienna)
Additional member: Prof. Dr. Birgit Beckmann (Technische Universität Dresden)
Monday, 5. of August 2024 - Friday, 9. of August 2024
10:00 am - 4:00 pm
Concrete Art Project 2024 in Aachen
The "Concrete Art Project" will also be opening its doors in Dresden and Aachen during the upcoming summer vacations! As part of the CRC/Transregio/TRR280, children, young people, artists and scientists will give free rein to their creativity. We want to get young people interested in the topic of "Building the future with concrete" in a sustainable and creative way. The concrete art project is now in its third round, following the very successful kick-off events in previous years. We look forward to being able to offer this interesting program for schoolchildren again this year.
Monday, 24. of June 2024 - Friday, 28. of June 2024
10:00 am - 4:00 pm
Concrete ART Project 2024 in Dresden
The "Concrete Art Project" will also be opening its doors in Dresden and Aachen during the upcoming summer vacations! As part of the CRC/Transregio/TRR280, children, young people, artists and scientists will give free rein to their creativity. We want to get young people interested in the topic of "Building the future with concrete" in a sustainable and creative way. The concrete art project is now in its third round, following the very successful kick-off events in previous years. We look forward to being able to offer this interesting program for schoolchildren again this year.
Thursday, 14. of March 2024 - Friday, 15. of March 2024
9:00 am - 5:00 pm
Architectured Materials: Searching for a Common Ground for Mathematicians, Engineers, and Materials Scientists
This Mini-workshop will be held in hybrid format in Aachen during a visit of Prof. Yuri Estrin (Monash University) and Prof. Vinayak Krishnamurthy (A&M University Texas). The aim of the workshop is to bring together mathematicians, engineers and material scientists to investigate common research interests.
An informal meeting to get to know each other and discuss research interests will take place on the 14.3.2024. Talks will be held on the 14.3. and 15.3.2024. We are currently inviting 30 mins talks from researchers within the SFB TRR 280.
Please send a title and a brief abstract to Alice Niemeyer if you are willing to offer a talk.
16:00 Tine Tysmans, Vrije Universiteit Brussel, Belgium "From 3D textiles to 3D structures in textile reinforced concrete"
Concrete and slenderness are no longer contradictory with the emergence of textile reinforced concrete. Replacing corrosive steel reinforcement by fibre grids, this material system allows for an unseen resource-efficiency. Slender, thin structures entail however challenges as the structural stiffness is no longer achieved by bulky cross-sections. This demands for a shift in the way we design with textile reinforced concrete. In this talk we will present structural typologies that achieve stiffness by their design rather than by material quantity, including sandwich systems and modular curved shells. We focus on their loadbearing potential and modelling, but also on the constructional challenges they entail and make the link with promising material developments like 3D textiles.
17:00 Robert Filipek, AGH University of Krakow, Faculty of Materials Science and Ceramics, Poland Ehrenfried Zschech, deepXscan GmbH, Dresden, Germany “High-resolution XCT study of concrete and multi-ion transport modelling”
Corrosion of steel reinforcements in concrete constructions is a worldwide problem. In order to assess the degradation of rebars in reinforced concrete, an accurate description of electric current, potential and concentrations of various species present in the concrete matrix is necessary. Although the concrete matrix is a heterogeneous porous material with intricate microstructure, mass transport has been treated in a homogeneous material so far, modifying bulk transport coefficients by additional factors (porosity, permeability, tortuosity). We will present an approach where the real 3D microstructure of concrete is obtained from high-resolution X-ray computed tomography (XCT), and we will demonstrate that multi-scale 3D imaging provides much more information about material’s microstructure and ion transport processes than a scalar quantity. The experimental XCT data are processed to generate a mesh for finite element method (FEM) computations, and finally combined with a multi-species system of transport and electric potential equations. This methodology allows for a more realistic description of ion movements and reactions in the bulk concrete and on the rebar surface, and in consequence, a better evaluation of anodic and cathodic currents which are ultimately responsible for the loss of reinforcement mas s and its location. The results of this study are compared with a literature model and with numerical calculations for 2D and 3D geometries.
