RWTH Aachen University
Fak. Bauingenieurwesen
Pavillon T3 (2125)
Mies-van-der-Rohe-Str. 1
52074 Aachen

and

TU Dresden
Fak. Bauingenieurwesen
August-Bebel-Straße 30/30A,
room ABS-03-007 (3rd floor)
01219 Dresden

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.

online access
https://rwth.zoom-x.de/j/63602995436?pwd=OWRGYU9kditsa1l0d2U1T3RURUdzUT09
Meeting ID: 636 0299 5436
Passcode: 610941