Influence of water-induced damage mechanisms on the fatigue deterioration of high-strength concrete

authored by: Christoph Tomann, Ludger Lohaus, Fadi Aldakheel, Peter Wriggers
Abstract: Concrete specimens which are submerged in water have a significantly lower fatigue resistance than specimens which are stored and tested in air. This phenomenon was recognised in the past, but how the moisture content in the microstructure of the concrete influences its resistance against fatigue deterioration is still unknown. Well-instrumented fatigue tests on high-strength concrete specimens are conducted to investigate how the moisture content in the microstructure of concrete influences its fatigue resistance and which additional water-induced damage mechanisms are involved in the degradation process. Furthermore, a dependency of different load frequencies is examined. Since water-induced damage mechanisms act on a very small scale, which cannot be directly observed during the tests, a multiscale numerical approach is necessary to describe water-induced damage mechanisms in fatigue-loaded concrete. This paper presents results of fatigue tests on high-strength concrete specimens with different moisture contents and load frequencies tested in air and under water. The number of cycles to failure, the development of stiffness and the acoustic emission are analysed over the degradation process of the concrete. Finally, a numeric modelling approach is presented.
Organisation(s): Institute of Building Materials Science
Institute of Continuum Mechanics
Type: Conference contribution
Pages: 1944-1951
No. of pages: 8
Publication date: 05.2019
Publication status: Published
Peer reviewed: Yes
ASJC Scopus subject areas: Building and Construction, Architecture, Civil and Structural Engineering
Electronic version(s): https://www.researchgate.net/publication/333578602_Influence_of_water-induced_damage_mechanisms_on_the_fatigue_deterioration_of_high-strength_concrete (Access: Open)
: Details in the research portal "Research@Leibniz University"

BibTeX

@inproceedings{853c7947f2074a998ae48f518b3fb9c4,
title = "Influence of water-induced damage mechanisms on the fatigue deterioration of high-strength concrete",
abstract = "Concrete specimens which are submerged in water have a significantly lower fatigue resistance than specimens which are stored and tested in air. This phenomenon was recognised in the past, but how the moisture content in the microstructure of the concrete influences its resistance against fatigue deterioration is still unknown. Well-instrumented fatigue tests on high-strength concrete specimens are conducted to investigate how the moisture content in the microstructure of concrete influences its fatigue resistance and which additional water-induced damage mechanisms are involved in the degradation process. Furthermore, a dependency of different load frequencies is examined. Since water-induced damage mechanisms act on a very small scale, which cannot be directly observed during the tests, a multiscale numerical approach is necessary to describe water-induced damage mechanisms in fatigue-loaded concrete. This paper presents results of fatigue tests on high-strength concrete specimens with different moisture contents and load frequencies tested in air and under water. The number of cycles to failure, the development of stiffness and the acoustic emission are analysed over the degradation process of the concrete. Finally, a numeric modelling approach is presented.",
keywords = "Fatigue deterioration, High-strength concrete, Microscale model, Moisture content, Phase-field, Porous media, Stiffness, Water-induced degradation mechanisms",
author = "Christoph Tomann and Ludger Lohaus and Fadi Aldakheel and Peter Wriggers",
note = "Funding information: This research was supported by the Federal Ministry of Economic Affairs and Energy and the German Research Foundation (DFG). The authors would like to express their gratitude for the financial support.; fib Symposium 2019: Concrete - Innovations in Materials, Design and Structures ; Conference date: 27-05-2019 Through 29-05-2019",
year = "2019",
month = may,
language = "English",
pages = "1944--1951",
editor = "Wit Derkowski and Piotr Krajewski and Piotr Gwozdziewicz and Marek Pantak and Lukasz Hojdys",
booktitle = "Proceedings of the fib Symposium 2019",
publisher = "International Federation for Structural Concrete",
}