Discrete Element Modeling and Electron Microscopy Investigation of Fatigue-Induced Microstructural Changes in Ultra-High-Performance Concrete

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 r...

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Autores principales:	Sebastian Rybczynski, Gunnar Schaan, Maksym Dosta, Martin Ritter, Frank Schmidt-Döhl
Formato:	article
Lenguaje:	EN
Publicado:	MDPI AG 2021
Materias:	ultra-high-performance concrete fatigue electron microscopy ettringite transformation bonded particle model discrete element method Technology T Electrical engineering. Electronics. Nuclear engineering TK1-9971 Engineering (General). Civil engineering (General) TA1-2040 Microscopy QH201-278.5 Descriptive and experimental mechanics QC120-168.85
Acceso en línea:	https://doaj.org/article/31bea7ec6fdf4fe4bf281dd318dfe6c3
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spelling	oai:doaj.org-article:31bea7ec6fdf4fe4bf281dd318dfe6c32021-11-11T17:54:26ZDiscrete Element Modeling and Electron Microscopy Investigation of Fatigue-Induced Microstructural Changes in Ultra-High-Performance Concrete10.3390/ma142163371996-1944https://doaj.org/article/31bea7ec6fdf4fe4bf281dd318dfe6c32021-10-01T00:00:00Zhttps://www.mdpi.com/1996-1944/14/21/6337https://doaj.org/toc/1996-1944In 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.Sebastian RybczynskiGunnar SchaanMaksym DostaMartin RitterFrank Schmidt-DöhlMDPI AGarticleultra-high-performance concretefatigueelectron microscopyettringite transformationbonded particle modeldiscrete element methodTechnologyTElectrical engineering. Electronics. Nuclear engineeringTK1-9971Engineering (General). Civil engineering (General)TA1-2040MicroscopyQH201-278.5Descriptive and experimental mechanicsQC120-168.85ENMaterials, Vol 14, Iss 6337, p 6337 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	ultra-high-performance concrete fatigue electron microscopy ettringite transformation bonded particle model discrete element method Technology T Electrical engineering. Electronics. Nuclear engineering TK1-9971 Engineering (General). Civil engineering (General) TA1-2040 Microscopy QH201-278.5 Descriptive and experimental mechanics QC120-168.85
spellingShingle	ultra-high-performance concrete fatigue electron microscopy ettringite transformation bonded particle model discrete element method Technology T Electrical engineering. Electronics. Nuclear engineering TK1-9971 Engineering (General). Civil engineering (General) TA1-2040 Microscopy QH201-278.5 Descriptive and experimental mechanics QC120-168.85 Sebastian Rybczynski Gunnar Schaan Maksym Dosta Martin Ritter Frank Schmidt-Döhl Discrete Element Modeling and Electron Microscopy Investigation of Fatigue-Induced Microstructural Changes in Ultra-High-Performance Concrete
description	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.
format	article
author	Sebastian Rybczynski Gunnar Schaan Maksym Dosta Martin Ritter Frank Schmidt-Döhl
author_facet	Sebastian Rybczynski Gunnar Schaan Maksym Dosta Martin Ritter Frank Schmidt-Döhl
author_sort	Sebastian Rybczynski
title	Discrete Element Modeling and Electron Microscopy Investigation of Fatigue-Induced Microstructural Changes in Ultra-High-Performance Concrete
title_short	Discrete Element Modeling and Electron Microscopy Investigation of Fatigue-Induced Microstructural Changes in Ultra-High-Performance Concrete
title_full	Discrete Element Modeling and Electron Microscopy Investigation of Fatigue-Induced Microstructural Changes in Ultra-High-Performance Concrete
title_fullStr	Discrete Element Modeling and Electron Microscopy Investigation of Fatigue-Induced Microstructural Changes in Ultra-High-Performance Concrete
title_full_unstemmed	Discrete Element Modeling and Electron Microscopy Investigation of Fatigue-Induced Microstructural Changes in Ultra-High-Performance Concrete
title_sort	discrete element modeling and electron microscopy investigation of fatigue-induced microstructural changes in ultra-high-performance concrete
publisher	MDPI AG
publishDate	2021
url	https://doaj.org/article/31bea7ec6fdf4fe4bf281dd318dfe6c3
work_keys_str_mv	AT sebastianrybczynski discreteelementmodelingandelectronmicroscopyinvestigationoffatigueinducedmicrostructuralchangesinultrahighperformanceconcrete AT gunnarschaan discreteelementmodelingandelectronmicroscopyinvestigationoffatigueinducedmicrostructuralchangesinultrahighperformanceconcrete AT maksymdosta discreteelementmodelingandelectronmicroscopyinvestigationoffatigueinducedmicrostructuralchangesinultrahighperformanceconcrete AT martinritter discreteelementmodelingandelectronmicroscopyinvestigationoffatigueinducedmicrostructuralchangesinultrahighperformanceconcrete AT frankschmidtdohl discreteelementmodelingandelectronmicroscopyinvestigationoffatigueinducedmicrostructuralchangesinultrahighperformanceconcrete
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Discrete Element Modeling and Electron Microscopy Investigation of Fatigue-Induced Microstructural Changes in Ultra-High-Performance Concrete

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