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Multiscale Toughening Mechanism in Hybrid Fiber Reinforced Cement-Based Nanocomposites

Danoglidis, Panagiotis A. / Singh, Rohitashva K. / Konsta-Gdoutos, Maria S.

In this study, a thorough evaluation of the toughening mechanism in cement-based nanocomposites reinforced with hybrid networks of carbon nanofibers (CNFs) and polypropylene microfibers (PPs) took place. The critical values of fracture toughness/stress intensity factor, $K_{IC}^{S}$ \documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$${K}_{IC}^{S}$$\end{document}, were experimentally determined on prismatic notched specimens of nano and micro scale fiber reinforced cementitious composites using the two-parameter fracture model (TPFM). The post-crack energy absorption capacity of the hybrid-composites was assessed by evaluating the dimensionless toughness index, I₂₀, calculated through linear elastic fracture mechanics (LEFM) tests. The addition of CNF/PP networks at low volume fractions of about 0.1 vol% in cementitious matrix results in a significant improvement in the $K_{IC}^{S}$ \documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$${K}_{IC}^{S}$$\end{document} (85–240%) and 1.6 – 10x higher I₂₀ compared to the CNF or PP reinforced materials. Relative to the single-scale fiber reinforcement, the synergy between the nano- and micro- scale fibers results in a multi-scale crack arresting distinctively increasing the toughening effect in the hybrid fiber-cementitious mortar nanocomposites.

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Multiscale Toughening Mechanism in Hybrid Fiber Reinforced Cement-Based Nanocomposites

Danoglidis, Panagiotis A. / Singh, Rohitashva K. / Konsta-Gdoutos, Maria S.

In this study, a thorough evaluation of the toughening mechanism in cement-based nanocomposites reinforced with hybrid networks of carbon nanofibers (CNFs) and polypropylene microfibers (PPs) took place. The critical values of fracture toughness/stress intensity factor, $K_{IC}^{S}$ \documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$${K}_{IC}^{S}$$\end{document}, were experimentally determined on prismatic notched specimens of nano and micro scale fiber reinforced cementitious composites using the two-parameter fracture model (TPFM). The post-crack energy absorption capacity of the hybrid-composites was assessed by evaluating the dimensionless toughness index, I₂₀, calculated through linear elastic fracture mechanics (LEFM) tests. The addition of CNF/PP networks at low volume fractions of about 0.1 vol% in cementitious matrix results in a significant improvement in the $K_{IC}^{S}$ \documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$${K}_{IC}^{S}$$\end{document} (85–240%) and 1.6 – 10x higher I₂₀ compared to the CNF or PP reinforced materials. Relative to the single-scale fiber reinforcement, the synergy between the nano- and micro- scale fibers results in a multi-scale crack arresting distinctively increasing the toughening effect in the hybrid fiber-cementitious mortar nanocomposites.

Multiscale Toughening Mechanism in Hybrid Fiber Reinforced Cement-Based Nanocomposites

Danoglidis, Panagiotis A. / Singh, Rohitashva K. / Konsta-Gdoutos, Maria S.

In this study, a thorough evaluation of the toughening mechanism in cement-based nanocomposites reinforced with hybrid networks of carbon nanofibers (CNFs) and polypropylene microfibers (PPs) took place. The critical values of fracture toughness/stress intensity factor, $K_{IC}^{S}$ \documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$${K}_{IC}^{S}$$\end{document}, were experimentally determined on prismatic notched specimens of nano and micro scale fiber reinforced cementitious composites using the two-parameter fracture model (TPFM). The post-crack energy absorption capacity of the hybrid-composites was assessed by evaluating the dimensionless toughness index, I₂₀, calculated through linear elastic fracture mechanics (LEFM) tests. The addition of CNF/PP networks at low volume fractions of about 0.1 vol% in cementitious matrix results in a significant improvement in the $K_{IC}^{S}$ \documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$${K}_{IC}^{S}$$\end{document} (85–240%) and 1.6 – 10x higher I₂₀ compared to the CNF or PP reinforced materials. Relative to the single-scale fiber reinforcement, the synergy between the nano- and micro- scale fibers results in a multi-scale crack arresting distinctively increasing the toughening effect in the hybrid fiber-cementitious mortar nanocomposites.

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Title:

Multiscale Toughening Mechanism in Hybrid Fiber Reinforced Cement-Based Nanocomposites

Additional title:

RILEM Bookseries

Contributors:

Mechtcherine, Viktor (editor) / Signorini, Cesare (editor) / Junger, Dominik (editor) / Danoglidis, Panagiotis A. (author) / Singh, Rohitashva K. (author) / Konsta-Gdoutos, Maria S. (author)

Conference:

RILEM-fib International Symposium on Fibre Reinforced Concrete ; 2024 ; Dresden, Germany

Published in:

Transforming Construction: Advances in Fiber Reinforced Concrete ; Chapter: 21 ; 163-169

RILEM Bookseries ; 54

Publication date:

2024-09-12

Size:

7 pages

ISBN:

978-3-031-70145-0 , 978-3-031-70144-3

ISSN:

2211-0852 , 2211-0844

DOI:

https://doi.org/10.1007/978-3-031-70145-0_21

Type of media:

Article/Chapter (Book)

Type of material:

Electronic Resource

Language:

English

Keywords:

Mortars , Carbon nanofibers , polypropylene fibers , hybrid , Fracture toughness , stress intensity factor , strain energy release rate , modulus Engineering , Building Materials , Structural Materials , Sustainable Development

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