PSI - Issue 74

Petr Miarka et al. / Procedia Structural Integrity 74 (2025) 50–55 Petr Miarka / Structural Integrity Procedia 00 (2025) 000 – 000

55

6

Conclusions This study re-evaluated the fracture and fatigue behaviour of high-performance concrete (HPC) under static, low cycle, and high-cycle loading at 365 days of age. Notched three-point bending tests were used, using either CMOD controlled mode for static and low-cycle tests or with a loading frequency of 10 Hz for high-cycle fatigue tests. While static loading produced a relatively homogeneous response, cyclic loading revealed greater heterogeneity, reflecting the effects of fatigue damage and meso-structural variability. The static tests provided the fracture energy, while the low-cycle fatigue tests evaluated the damage parameter, and the high-cycle regime was characterised through S–N and Paris law crack growth curves. The obtained experimental results align well with previously published data, confirming the reliability of the testing methodology. The S–N curve revealed that a 30% reduction strength was necessary to reach the fatigue limit of 2 × 10 6 . Acknowledgements This paper was created as a part of project No.CZ.02.01.01/00/22_008/0004631 Materials and technologies for sustainable development within the OP JAK Program financed by the European Union and from the state budget of the Czech Republic as well as the financial support from the Czech Science Foundation under project no. 25-15755S. Data availability The data used in this study are available at: https://doi.org/10.5281/zenodo.15341786 References Basquin, O.H., 1910. The exponential law of endurance tests. Am. Soc. for Test. and Mat. Proceedings 10, 625-630. Bazant, Z.P., Schell W.F., 1993. Fatigue fracture of high-strength concrete and size effect. ACI Mater. J. 90:472. Baktheer, A. Becks, H., 2021. Fracture mechanics based interpretation of the load sequence effect in the flexural fatigue behavior of concrete using digital image correlation. Construction and Building Materials, 307, 124817. Baktheer, E. Martínez-Pañeda, F. Aldakheel, 2024. Phase field cohesive zone modeling for fatigue crack propagation in quasi-brittle materials, Computer Methods in Applied Mechanics and Engineering 422, 116834. RILEM-TCM85, 1985. Determination of the fracture energy of mortar and concrete by means of three-point bend tests on notched beams Materials and Structures 18(4), 287-290. Horii, H.C. Shin, T.M. Pallewatta, 1992. Mechanism of fatigue crack growth in concrete, Cemement Concrete Composites 14, 83–89. Á. Mena-Alonso, D.C. González, J. Mínguez, M.A. Vicentem, 2024. Size effect on the flexural fatigue behavior of high-strength plain and fiber- reinforced concrete, Construction and Building Materials 411, 134424. S Korte, V Boel, W De Corte, G De Schutter, 2014a. Static and fatigue fracture mechanics properties of self-compacting concrete using three-point bending tests and wedge-splitting tests, Construction and Building Materials 57, 1-8. S. Korte, V. Boel, W. De Corte, G. De Schutter, 2014b. Behaviour of fatigue loaded self-compacting concrete compared to vibrated concrete, Structural Concrete 15 575–589. Lee, M.K., Barr, B.I.G., 2004. An overview of the fatigue behaviour of plain and fibre reinforced concrete. Cement and Concrete Composites 26, 299-305. Miarka, P., Seitl S., Bílek, V., Cifuentes Bulte H., 2022. Assessment of fatigue resistance of concrete: S-N curves to the Paris law curves. Construction and Building Materials 341, 127811. Miarka P., Šimonová H., Kucharczyková B., Seitl S., Poletanovic B., Merta I. 2025. Optimisation of fine RCA content in mortar mixture based on the long-term fracture and fatigue tests. Construction and Building Materials 481, 141371 Paris, P., Erdogan, F., 1963. A Critical Analysis of Crack Propagation Laws, Journal of Basic Engineering, 85, 528-533 Šimonová, H., Kucharczyková, B., Bílek, V., Malíková, L., Miarka, P., Lipowczan, M. 2021. Mechanical fracture and fatigue characteristics of fine-grained composite based on sodium hydroxide-activated slag cured under high relative humidity. Applied Sciences - Basel, 11(1), 1–20.