A5001337521- Concrete Properties and Behavior
- Fire effects on concrete materials
- Concrete and Cement Materials Research
- Composite Material Mechanics
- Structural Response to Dynamic Loads
- Geotechnical Engineering and Underground Structures
- Asphalt Pavement Performance Evaluation
- Rock Mechanics and Modeling
- Grouting, Rheology, and Soil Mechanics
- Rare-earth and actinide compounds
- Geotechnical Engineering and Analysis
- Numerical methods in engineering
- Innovative concrete reinforcement materials
- Advanced Mathematical Modeling in Engineering
- Fire dynamics and safety research
- Structural Behavior of Reinforced Concrete
- Iron-based superconductors research
- Physics of Superconductivity and Magnetism
- Metal and Thin Film Mechanics
- Infrastructure Maintenance and Monitoring
- Civil and Structural Engineering Research
- Drilling and Well Engineering
- Engineering and Material Science Research
- Innovations in Concrete and Construction Materials
- Advanced Thermoelectric Materials and Devices
Universität Innsbruck
2016-2025
FH Kärnten
2021
PNDetector (Germany)
2017-2019
Christian Doppler Laboratory for Thermoelectricity
2004-2018
Max Planck Institute for Nuclear Physics
2013
TU Wien
2001-2010
Technical University of Munich
2007-2008
University of Vienna
2007
Arup Group (United States)
2005
A material model for plain concrete formulated within the framework of multisurface elastoplasticity-damage theory is proposed in this paper. Anisotropic stiffness degradation as well inelastic deformations are taken into account. The applicability encompasses cracking non-linear response compression. effect different softening laws on stress–strain relationship and dissipation investigated context a 1D problem. integration evolution based standard return map scheme. Further computational...
ABSTRACT The identification of material phases at the so called bitumen-scale in context multiscale modeling asphalt is presented. For this purpose, atomic force microscopy (AFM), providing insight into surface topography and mechanical properties, applied to different types bitumen. Based on obtained AFM results, four are identified. These related chemical composition bitumen, characterized by a wide range molecular mass. Within anticipated multi-scale model, properties these serve as input...
The low viscosity of asphalt concrete at T>135°C is necessary for the construction and compaction process high-quality layers. Whereas continuous increase with decreasing temperature desirable reduction permanent deformations during warm periods, so-called top-down cracking may occur in course drops cold periods. In order to explain complex viscoelastic properties concrete, a multiscale model proposed. Hereby, behavior bitumen serves as input effect air voids aggregates investigated. viscous...
Summary For tunnel constructed by New Austrian Tunnelling Method, the crown is upper part of section, during excavation process and supported shotcrete. The stability has great influence on safety itself buildings above, which correlates, among others, with geometrical setup material properties shotcrete soil/rock. In this paper, aiming at analyzing crown, a recently presented numerical method discontinuity layout optimization adopted, introduces amount potential discontinuities cross over...
Abstract Accounting for the large variation of asphalt mixes, resulting from variations constituents and composition, allowance additives, a multiscale model is currently developed at Christian Doppler Laboratory “Performance‐based optimization flexible road pavements”. The concept allows to relate macroscopic material properties phenomena finer scales observation. Starting with characterization finest scale, i.e., bitumen ‐scale, Atomic Force Microscopy (AFM) employed. Depending on mode...
Abstract In this paper, a parameter identification (PI) method for determination of unknown model parameters in geotechnical engineering is proposed. It based on measurement data provided by the construction site. Model finite element (FE) analyses are identified such that results these calculations agree with available as well possible. For parameters, use an artificial neural network (ANN) The trained to approximate FE simulations. A genetic algorithm (GA) uses ANN provide estimate optimal...
This paper focuses on the effect of filler low-temperature creep asphalt mastic. Based experimental results obtained from bending-beam rheometer (BBR) experiments for both pure bitumen and mastic characterized by different types content, a recently proposed multiscale model is employed prediction properties bitumen-filler composite. Accounting distinct matrix-inclusion morphology present at so-called mastic-scale, Mori–Tanaka scheme homogenization. homogenization applied to composite, giving...
Freezing of water in porous media such as soil results a change mechanical and thermal properties. This properties is exploited during artificial ground freezing (AGF) employed tunneling, open excavations, for retaining structures. In this paper, phase-change model the simulation fully saturated presented. Disregarding influence loading on process, only solution problem, i.e., determination temperature field, addressed. The (macroscopic) are related to material parameters different phases,...
We have investigated the thermal and electrical properties of filled skutterudites belonging to series Ce1−zYbzFe4Sb12 Cey∕2Yby∕2Fe4−x(Co∕Ni)xSb12, as well their potential for thermoelectric power generation. In first series, increasing Yb fraction decreases resistivity thermopower. These effects are related variations valence with (from 2.2 in Yb0.92Fe4Sb12 2.7 Ce0.85Yb0.05Fe4Sb12). The factor is increased Ce0.40Yb0.53Fe4Sb12 while conductivity reduced this leads an improved figure merit...
ABSTRACT Motivated by recent progress in both experimentation and the micromechanical description of behavior multi-composed materials, a multiscale model for asphalt is currently developed at Christian Doppler laboratory “Performance-Based Optimization Flexible Pavements” Vienna University Technology. This allows us to relate macroscopically observable properties finer-scale information. Since mechanical influence environmental conditions (temperature, aging) originate from binder...
Abstract: In order to relate the complex macroscopic behaviour of concrete with finer‐scale properties cement paste, aggregates, porous space, etc. multiscale models are developed. Here, in addition homogenisation schemes establishing relation between constituents, e.g. matrix and inclusions, composite material, experimental methods for identification required. Recently, elastic main clinker phases ordinary Portland (OPC) calcium‐silicate‐hydrates (CSH) were identified by nanoindentation...