TY - JOUR

T1 - Compressive Fatigue Behaviour of High-Strength Concrete and Mortar

T2 - Experimental Investigations and Computational Modelling

AU - Oneschkow, Nadja

AU - Timmermann, Tim

AU - Loehnert, Stefan

N1 - Funding Information: Funding: This research was funded by the Deutsche Forschungsgemeinschaft (DFG, German Research Foundation) within the conjoint project ‘Material composition influenced damage development in high-strength concrete under cyclic loading’, project number 353530889, within the DFG Priority Programme 2020 ‘Cyclic Deterioration of High-Performance Concrete in an Experimental-Virtual Lab’. Funding Information: Acknowledgments: The authors thank the Deutsche Forschungsgemeinschaft (DFG, German Research Foundation) for funding this research project.

PY - 2022/1/3

Y1 - 2022/1/3

N2 - 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.

AB - 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.

KW - Acoustic emission

KW - Computational modelling

KW - Fatigue damage

KW - Gradient-enhanced damage

KW - High-strength concrete

KW - High-strength mortar

UR - http://www.scopus.com/inward/record.url?scp=85122135169&partnerID=8YFLogxK

U2 - 10.3390/ma15010319

DO - 10.3390/ma15010319

M3 - Article

VL - 15

JO - MATERIALS

JF - MATERIALS

SN - 1996-1944

IS - 1

M1 - 319

ER -