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Acrylate-endcapped polymer precursors : effect of chemical composition on the healing efficiency of active concrete cracks

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Abstract
The repair of cracks in concrete is an unavoidable practice since these cracks endanger the durability of the structure. Inspired by nature, the self-healing concept has been widely investigated in concrete as a promising solution to solve the limitations of manual repair. This self-healing functionality may be realized by the incorporation of encapsulated healing agents in concrete. Depending on the nature of the cracks, different healing agents can be used. For structures subjected to repeated loads, elastic materials should be considered to cope with the crack opening and closing movement. In this study, various acrylate-endcapped polymer precursors were investigated for their suitability to heal active cracks. The strain capacity of the polymers was assessed by means of visual observation together with water flow tests after widening of the healed cracks in a stepwise manner. A strain of at least 50% could be sustained by epoxy-and siloxane-based healing agents. For polyester-and urethane/poly(propylene glycol)-based precursors, failure occurred at 50% elongation due to detachment of the polymer from the crack walls. However, for urethane/poly(propylene glycol)-based healing agent, debonding was limited to some local spots. The resistance of the polymerized healing agents against degradation in the strong alkaline environment characteristic for concrete has also been evaluated, with the urethane/poly(propylene glycol)-based precursor showing the best performance to withstand degradation.
Keywords
self-healing, concrete, acrylate-endcapped precursors, elastic polymers, active cracks, CEMENTITIOUS MATERIALS, SUPERABSORBENT POLYMERS, RELEASE, MORTAR, REPAIR, TUBES

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Chicago
Pereira Gomes de Araújo, Maria Adelaide, Kim Van Tittelboom, Peter Dubruel, Sandra Van Vlierberghe, and Nele De Belie. 2017. “Acrylate-endcapped Polymer Precursors : Effect of Chemical Composition on the Healing Efficiency of Active Concrete Cracks.” Smart Materials and Structures  26 (5).
APA
Pereira Gomes de Araújo, M. A., Van Tittelboom, K., Dubruel, P., Van Vlierberghe, S., & De Belie, N. (2017). Acrylate-endcapped polymer precursors : effect of chemical composition on the healing efficiency of active concrete cracks. SMART MATERIALS AND STRUCTURES  , 26(5).
Vancouver
1.
Pereira Gomes de Araújo MA, Van Tittelboom K, Dubruel P, Van Vlierberghe S, De Belie N. Acrylate-endcapped polymer precursors : effect of chemical composition on the healing efficiency of active concrete cracks. SMART MATERIALS AND STRUCTURES  . 2017;26(5).
MLA
Pereira Gomes de Araújo, Maria Adelaide et al. “Acrylate-endcapped Polymer Precursors : Effect of Chemical Composition on the Healing Efficiency of Active Concrete Cracks.” SMART MATERIALS AND STRUCTURES  26.5 (2017): n. pag. Print.
@article{8520236,
  abstract     = {The repair of cracks in concrete is an unavoidable practice since these cracks endanger the durability of the structure. Inspired by nature, the self-healing concept has been widely investigated in concrete as a promising solution to solve the limitations of manual repair. This self-healing functionality may be realized by the incorporation of encapsulated healing agents in concrete. Depending on the nature of the cracks, different healing agents can be used. For structures subjected to repeated loads, elastic materials should be considered to cope with the crack opening and closing movement. In this study, various acrylate-endcapped polymer precursors were investigated for their suitability to heal active cracks. The strain capacity of the polymers was assessed by means of visual observation together with water flow tests after widening of the healed cracks in a stepwise manner. A strain of at least 50\% could be sustained by epoxy-and siloxane-based healing agents. For polyester-and urethane/poly(propylene glycol)-based precursors, failure occurred at 50\% elongation due to detachment of the polymer from the crack walls. However, for urethane/poly(propylene glycol)-based healing agent, debonding was limited to some local spots. The resistance of the polymerized healing agents against degradation in the strong alkaline environment characteristic for concrete has also been evaluated, with the urethane/poly(propylene glycol)-based precursor showing the best performance to withstand degradation.},
  articleno    = {055031},
  author       = {Pereira Gomes de Ara{\'u}jo, Maria Adelaide and Van Tittelboom, Kim and Dubruel, Peter and Van Vlierberghe, Sandra and De Belie, Nele},
  issn         = {0964-1726},
  journal      = {SMART MATERIALS AND STRUCTURES                                               },
  language     = {eng},
  number       = {5},
  pages        = {9},
  title        = {Acrylate-endcapped polymer precursors : effect of chemical composition on the healing efficiency of active concrete cracks},
  url          = {http://dx.doi.org/10.1088/1361-665x/aa64cb},
  volume       = {26},
  year         = {2017},
}

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