Numerical and experimental analysis of fatigue-induced changes in ultra-high performance concrete

Start Page
1320
End Page
1326
Citation
8th International Conference on Structural Engineering, Mechanics and Computation (SEMC 2022): 1322-1326
Contribution to Conference
8th International Conference on Structural Engineering, Mechanics and Computation, SEMC 2022  
Publisher DOI
10.1201/9781003348443-215
Scopus ID
2-s2.0-85145551533
Publisher
CRC Press.
ISBN
978-1-003-34844-3
978-1-000-82436-0
978-1-000-82432-2
978-1-032-18698-6
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.
DDC Class
600: Technology