Compressive Fatigue Behaviour of High-Strength Concrete and Mortar

Experimental Investigations and Computational Modelling

authored by: Nadja Oneschkow, Tim Timmermann, Stefan Loehnert
Abstract: A high-strength concrete and mortar subjected to compressive fatigue loading were compar-atively investigated using experimental and computational techniques. The focus of the investigations was on the influence of the coarse aggregate in high-strength concrete. Accordingly, the fatigue behaviour was analysed experimentally using the macroscopic damage indicators strain, stiffness and acoustic emission hits. The results clearly show differences in the fatigue behaviour between the concrete and the mortar, especially at the lower stress level investigated. The basalt coarse aggregate here improves the fatigue behaviour of the concrete. Indication of a negative effect can be seen at the higher stress level. A finite element approach with a gradient-enhanced equivalent strain-based damage model combined with a fatigue model was used for the computational simulation of the fatigue behaviour. The damage model includes a differentiation between tension and compression. The fatigue model follows the assumption of the reduction in the material strength based on the accu-mulated gradient-enhanced equivalent strains. A random distribution of spherically shaped basalt aggregates following a given particle size distribution curve is used for the simulation of concrete. The comparison of the experimentally and computationally determined strain developments of the concrete and mortar shows very good agreement.
Organisation(s): Institute of Building Materials Science
Institute of Continuum Mechanics
Type: Article
Journal: MATERIALS
Volume: 15
ISSN: 1996-1944
Publication date: 03.01.2022
Publication status: Published
Peer reviewed: Yes
ASJC Scopus subject areas: Condensed Matter Physics, General Materials Science
Electronic version(s): https://doi.org/10.3390/ma15010319 (Access: Open)
: Details in the research portal "Research@Leibniz University"

BibTeX

@article{91f5c31fb1d24caa91e74823f22e0205,
title = "Compressive Fatigue Behaviour of High-Strength Concrete and Mortar: Experimental Investigations and Computational Modelling",
abstract = "A high-strength concrete and mortar subjected to compressive fatigue loading were compar-atively investigated using experimental and computational techniques. The focus of the investigations was on the influence of the coarse aggregate in high-strength concrete. Accordingly, the fatigue behaviour was analysed experimentally using the macroscopic damage indicators strain, stiffness and acoustic emission hits. The results clearly show differences in the fatigue behaviour between the concrete and the mortar, especially at the lower stress level investigated. The basalt coarse aggregate here improves the fatigue behaviour of the concrete. Indication of a negative effect can be seen at the higher stress level. A finite element approach with a gradient-enhanced equivalent strain-based damage model combined with a fatigue model was used for the computational simulation of the fatigue behaviour. The damage model includes a differentiation between tension and compression. The fatigue model follows the assumption of the reduction in the material strength based on the accu-mulated gradient-enhanced equivalent strains. A random distribution of spherically shaped basalt aggregates following a given particle size distribution curve is used for the simulation of concrete. The comparison of the experimentally and computationally determined strain developments of the concrete and mortar shows very good agreement.",
keywords = "Acoustic emission, Computational modelling, Fatigue damage, Gradient-enhanced damage, High-strength concrete, High-strength mortar",
author = "Nadja Oneschkow and Tim Timmermann and Stefan Loehnert",
note = "Funding Information: Funding: This research was funded by the Deutsche Forschungsgemeinschaft (DFG, German Research Foundation) within the conjoint project {\textquoteleft}Material composition influenced damage development in high-strength concrete under cyclic loading{\textquoteright}, project number 353530889, within the DFG Priority Programme 2020 {\textquoteleft}Cyclic Deterioration of High-Performance Concrete in an Experimental-Virtual Lab{\textquoteright}. Funding Information: Acknowledgments: The authors thank the Deutsche Forschungsgemeinschaft (DFG, German Research Foundation) for funding this research project.",
year = "2022",
month = jan,
day = "3",
doi = "10.3390/ma15010319",
language = "English",
volume = "15",
journal = "MATERIALS",
issn = "1996-1944",
publisher = "MDPI AG",
number = "1",
}