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Publisher DOI: 10.3390/ma14216337
Title: Discrete element modeling and electron microscopy investigation of fatigue-induced microstructural changes in ultra-high-performance concrete
Language: English
Authors: Rybczynski, Sebastian 
Schaan, Gunnar 
Dosta, Maksym 
Ritter, Martin  
Schmidt-Döhl, Frank  
Keywords: ultra-high-performance concrete; fatigue; electron microscopy; ettringite transformation; bonded particle model; discrete element method; rheological model; crack propagation
Issue Date: 23-Oct-2021
Publisher: MDPI
Source: Materials 14 (21): 6337 (2021-10-23)
Abstract (english): 
In view of the growing demand for sustainable and lightweight concrete structures, the use of ultra-high-performance concrete (UHPC) is becoming increasingly important. However, fatigue loads occur more frequently in nature than static loads. Despite the impressive mechanical properties of UHPC, a reduced tolerance for cyclic loading is known. For this reason, our paper deals with experimental and numerical investigations regarding the main causes for crack initiation on the meso, micro, and nanoscale. After mechanical fatigue tests, we use both scanning (SEM) and transmission electron microscopy (TEM) to characterize microstructural changes. A new rheological model was developed to apply those changes to the mesoscopic scale. The origins of fatigue damaging can be traced back to a transformation of nanoscale ettringite, resulting in a densification of the surrounding binder matrix. Additionally, a higher content of unhydrated cement clinker in the matrix benefits fatigue resistance. On the mesoscale, stress peaks around aggregate grains expand into the surrounding binder with increasing load cycles and lead to higher degradation.
DOI: 10.15480/882.3876
ISSN: 1996-1944
Journal: Materials 
Institute: Feststoffverfahrenstechnik und Partikeltechnologie V-3 
Baustoffe, Bauphysik und Bauchemie B-3 
Betriebseinheit Elektronenmikroskopie M-26 
Mehrskalensimulation von Feststoffsystemen V-EXK1 
Document Type: Article
Project: SPP2020: Cyclic damage processes in high-performance concretes in the Experimental Virtual Lab 
Funded by: Deutsche Forschungsgemeinschaft (DFG) 
More Funding information: This research was funded by the Deutsche Forschungsgemeinschaft (DFG, German Research Foundation), grant number 353408149, as part of the priority program “SPP2020: Cyclic damage processes in high-performance concretes in the Experimental Virtual Lab”.
License: CC BY 4.0 (Attribution) CC BY 4.0 (Attribution)
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