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Screening of different encapsulated polymer-based healing agents for chloride exposed self-healing concrete using chloride migration tests

(2018) KEY ENGINEERING MATERIALS. 761. p.152-158
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Abstract
The service life of steel reinforced concrete in aggressive marine environments could be increased substantially by embedding a self-healing mechanism that ensures autonomous healing of cracks upon their occurrence. Previous proof-of-concept experiments have shown that the incorporation of encapsulated polymer-based healing agents (HAs) counts as a very appropriate way to achieve this goal. Over the years, several polymer-precursor-capsule systems have been developed in that perspective at our laboratory. Cementitious materials containing either commercial or in-house developed encapsulated HAs have been subjected to preliminary feasibility tests (water absorption, permeability tests, etc.). However, these experiments did not yet allow for a fast and straightforward assessment of the self-healing efficiency (SHE) in relation to the expected durability and service life performance of the material. This approach would have many advantages when having to select the most suitable polymer-precursor-capsule system for a particular concrete application. In this paper, a modified chloride migration test based on the one prescribed in NT Build 492 has been proposed to support the development of self-healing concrete for marine environments. Four polymer-based HAs have been screened that way, i.e. an in-house developed high-viscosity polyurethane (PU) precursor, a commercial low-viscosity PU precursor, the same commercial PU precursor with addition of accelerator and benzoyl peroxide (BPO), and an in-house developed 2-component acrylate-endcapped precursor + cross-linker. For now, a highly repeatable SHE value of 100% could only be obtained for the second option.
Keywords
concrete cracking, autonomous healing, encapsulated polymer precursor, chloride migration resistance, self-healing efficiency

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Chicago
Van den Heede, Philip, Bjorn Van Belleghem, Maria Adelaide Pereira Gomes de Araújo, João Luis Garcia Feiteira, and Nele De Belie. 2018. “Screening of Different Encapsulated Polymer-based Healing Agents for Chloride Exposed Self-healing Concrete Using Chloride Migration Tests.” Key Engineering Materials 761: 152–158.
APA
Van den Heede, P., Van Belleghem, B., Pereira Gomes de Araújo, M. A., Garcia Feiteira, J. L., & De Belie, N. (2018). Screening of different encapsulated polymer-based healing agents for chloride exposed self-healing concrete using chloride migration tests. KEY ENGINEERING MATERIALS, 761, 152–158.
Vancouver
1.
Van den Heede P, Van Belleghem B, Pereira Gomes de Araújo MA, Garcia Feiteira JL, De Belie N. Screening of different encapsulated polymer-based healing agents for chloride exposed self-healing concrete using chloride migration tests. KEY ENGINEERING MATERIALS. Trans Tech Publications; 2018;761:152–8.
MLA
Van den Heede, Philip et al. “Screening of Different Encapsulated Polymer-based Healing Agents for Chloride Exposed Self-healing Concrete Using Chloride Migration Tests.” KEY ENGINEERING MATERIALS 761 (2018): 152–158. Print.
@article{8600983,
  abstract     = {The service life of steel reinforced concrete in aggressive marine environments could be increased substantially by embedding a self-healing mechanism that ensures autonomous healing of cracks upon their occurrence. Previous proof-of-concept experiments have shown that the incorporation of encapsulated polymer-based healing agents (HAs) counts as a very appropriate way to achieve this goal. Over the years, several polymer-precursor-capsule systems have been developed in that perspective at our laboratory. Cementitious materials containing either commercial or in-house developed encapsulated HAs have been subjected to preliminary feasibility tests (water absorption, permeability tests, etc.). However, these experiments did not yet allow for a fast and straightforward assessment of the self-healing efficiency (SHE) in relation to the expected durability and service life performance of the material. This approach would have many advantages when having to select the most suitable polymer-precursor-capsule system for a particular concrete application. In this paper, a modified chloride migration test based on the one prescribed in NT Build 492 has been proposed to support the development of self-healing concrete for marine environments. Four polymer-based HAs have been screened that way, i.e. an in-house developed high-viscosity polyurethane (PU) precursor, a commercial low-viscosity PU precursor, the same commercial PU precursor with addition of accelerator and benzoyl peroxide (BPO), and an in-house developed 2-component acrylate-endcapped precursor + cross-linker. For now, a highly repeatable SHE value of 100\% could only be obtained for the second option. },
  author       = {Van den Heede, Philip and Van Belleghem, Bjorn and Pereira Gomes de Ara{\'u}jo, Maria Adelaide and Garcia Feiteira, Jo{\~a}o Luis and De Belie, Nele},
  issn         = {1662-9795},
  journal      = {KEY ENGINEERING MATERIALS},
  language     = {eng},
  pages        = {152--158},
  publisher    = {Trans Tech Publications},
  title        = {Screening of different encapsulated polymer-based healing agents for chloride exposed self-healing concrete using chloride migration tests},
  url          = {http://dx.doi.org/10.4028/www.scientific.net/kem.761.152},
  volume       = {761},
  year         = {2018},
}

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