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Influence of Moisture Content and Wet Environment on the Fatigue Behaviour of High-Strength Concrete
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Christoph Tomann ,
Fadi Aldakheel Aldakheel,
Markus Mahlbacher ,
Nima Noii ,
Nadja Oneschkow ,
Karl-Heinz Drake,
Ludger Lohaus ,
Peter Wriggers ,
Michael Haist
Materials, Volume: 15, Issue: 3, Start page: 1025
Swansea University Author: Fadi Aldakheel Aldakheel
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DOI (Published version): 10.3390/ma15031025
Abstract
The influence of a wet environment on the fatigue behaviour of high-strength concrete has become more important in recent years with the expansion of offshore wind energy systems. According to the few investigations documented in the literature, the fatigue resistance of specimens submerged in water...
| Published in: | Materials |
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| ISSN: | 1996-1944 |
| Published: |
MDPI AG
2022
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| Online Access: |
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| URI: | https://cronfa.swan.ac.uk/Record/cronfa59278 |
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| Abstract: |
The influence of a wet environment on the fatigue behaviour of high-strength concrete has become more important in recent years with the expansion of offshore wind energy systems. According to the few investigations documented in the literature, the fatigue resistance of specimens submerged in water is significantly lower compared to that of specimens in dry conditions. However, it is still not clear how the wet environment and the moisture content in concrete influence its fatigue behaviour and which damage mechanisms are involved in the deterioration process. Here the results of a joint project are reported, in which the impact of moisture content in concrete on fatigue deterioration are investigated experimentally and numerically. Aside from the number of cycles to failure, the development of stiffness and acoustic emission (AE) hits are analysed as damage inductors and discussed along with results of microstructural investigations to provide insights into the degradation mechanisms. Subsequently, an efficient numeric modelling approach to water-induced fatigue damage is presented. The results of the fatigue tests show an accelerated degradation behaviour with increasing moisture content of the concrete. Further, it was found that the AE hits of specimens submerged in water occur exclusively close to the minimum stress level in contrast to specimens subjected to dry conditions, which means that additional damage mechanisms are acting with increasing moisture content in the concrete. |
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| Keywords: |
high-strength concrete, moisture content, fatigue deterioration, water-induced degradation mechanisms, acoustic emissions analysis, phase-field approach, porous media theory, microscopic material model |
| College: |
Faculty of Science and Engineering |
| Funders: |
This research was funded by the Deutsche Forschungsgemeinschaft (DFG, German Research Foundation)—Project numbers (353757395) (HA 7917/7-2 | LO 751/22-2 | WR 19/58-2) within
the Priority Programme 2020 ‘Cyclic Deterioration of High-Performance Concrete in an ExperimentalVirtual Lab'. |
| Issue: |
3 |
| Start Page: |
1025 |