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Numerical and experimental analysis of fatigue-induced changes in ultra-high performance concrete
Publikationstyp
Conference Paper
Publikationsdatum
2022-09
Sprache
English
Author
Start Page
1320
End Page
1326
Citation
8th International Conference on Structural Engineering, Mechanics and Computation (SEMC 2022)
Contribution to Conference
Publisher DOI
Scopus ID
This contribution deals with experimental and numerical results on the fatigue behavior of Ultra-High Performance Concrete (UHPC). In order to characterize fatigue-induced changes in detail, UHPC samples were examined using scanning and transmission electron microscopy (SEM and TEM). It could be shown that a densification of the binder matrix occurs caused by a transformation of nanoscale ettringite, and the content of unhydrated cement clinker influences the fatigue resistance of UHPC. For numerical investigations of the mechanical behavior of UHPC, the Bonded-Particle Model (BPM) has been used and calibrated with experimental data. The mesoscopic BPM model consists of three phases: Matrix, ITZ (Interfacial Transition Zone), and aggregate. A newly derived rheological fatigue formulation for binder and ITZ bonds was developed to apply small scale-changes and plastic deformations to reproduce the correct fatigue behavior.