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Concrete fracture toughness increase by embedding self-healing capsules using an integrated experimental approach

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SECEMIN: self-healing cementitious and mineral building materials
Abstract
An alternative solution to repair cracks in concrete has been recently established, namely autonomous healing by embedding repair agent into concrete during casting. The agent is included into small-size capsules that break as cracks form. As the agent is released into the crack void, it solidifies fast permitting crack sealing and mechanical restoration. Most of literature studies focus on the healing system design and the repair efficiency assessment. However, limited knowledge exists on the effect of the macrocapsules themselves on concrete mechanical behaviour. This is a crucial subject as the healing mechanism should not compromise the material mechanical properties. The paper investigates the effect of capsules on damage resistance by considering fracture constitutive models. Fracture toughness of samples with capsules increases up to 35% compared to the reference. Acoustic emission is applied to assess the capsules effect on fracture processes. Events localization indicates fracture process zone expansion by 40%. It is proven that the capsules beneficially contribute as local reinforcement perturbating the crack path and forming multiple microcracks (additionally verified by Digital Image Correlation). In summary, an integrated experimental protocol is developed to highlight the concrete toughness enhancement by adding capsules.
Keywords
Concrete, Healing capsules, Fracture energy, Fracture process zone, AE events, AE energy

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Citation

Please use this url to cite or link to this publication:

Chicago
Tsangouri, Eleni, Francisco Antonio Gilabert Villegas, Nele De Belie, Danny Van Hemelrijck, Xingyi Zhu, and Dimitrios G. Aggelis. 2019. “Concrete Fracture Toughness Increase by Embedding Self-healing Capsules Using an Integrated Experimental Approach.” Ed. Michael C. Forde. Construction and Building Materials 218: 424–433.
APA
Tsangouri, Eleni, Gilabert Villegas, F. A., De Belie, N., Van Hemelrijck, D., Zhu, X., & Aggelis, D. G. (2019). Concrete fracture toughness increase by embedding self-healing capsules using an integrated experimental approach. (M. C. Forde, Ed.)CONSTRUCTION AND BUILDING MATERIALS , 218, 424–433.
Vancouver
1.
Tsangouri E, Gilabert Villegas FA, De Belie N, Van Hemelrijck D, Zhu X, Aggelis DG. Concrete fracture toughness increase by embedding self-healing capsules using an integrated experimental approach. Forde MC, editor. CONSTRUCTION AND BUILDING MATERIALS . Elsevier ; 2019;218:424–33.
MLA
Tsangouri, Eleni et al. “Concrete Fracture Toughness Increase by Embedding Self-healing Capsules Using an Integrated Experimental Approach.” Ed. Michael C. Forde. CONSTRUCTION AND BUILDING MATERIALS 218 (2019): 424–433. Print.
@article{8617362,
  abstract     = {An alternative solution to repair cracks in concrete has been recently established, namely autonomous
healing by embedding repair agent into concrete during casting. The agent is included into small-size
capsules that break as cracks form. As the agent is released into the crack void, it solidifies fast permitting
crack sealing and mechanical restoration. Most of literature studies focus on the healing system design
and the repair efficiency assessment. However, limited knowledge exists on the effect of the macrocapsules
themselves on concrete mechanical behaviour. This is a crucial subject as the healing mechanism
should not compromise the material mechanical properties. The paper investigates the effect of capsules
on damage resistance by considering fracture constitutive models. Fracture toughness of samples
with capsules increases up to 35% compared to the reference. Acoustic emission is applied to assess
the capsules effect on fracture processes. Events localization indicates fracture process zone expansion
by 40%. It is proven that the capsules beneficially contribute as local reinforcement perturbating the crack
path and forming multiple microcracks (additionally verified by Digital Image Correlation). In summary,
an integrated experimental protocol is developed to highlight the concrete toughness enhancement by
adding capsules.},
  author       = {Tsangouri, Eleni and Gilabert Villegas, Francisco Antonio and De Belie, Nele and Van Hemelrijck, Danny and Zhu, Xingyi and Aggelis, Dimitrios G.},
  editor       = {Forde, Michael C.},
  issn         = {0950-0618},
  journal      = {CONSTRUCTION AND BUILDING MATERIALS },
  keywords     = {Concrete,Healing capsules,Fracture energy,Fracture process zone,AE events,AE energy},
  language     = {eng},
  pages        = {424--433},
  publisher    = {Elsevier },
  title        = {Concrete fracture toughness increase by embedding self-healing capsules using an integrated experimental approach},
  url          = {http://dx.doi.org/10.1016/j.conbuildmat.2019.05.138},
  volume       = {218},
  year         = {2019},
}

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