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Neutron radiography based visualization and profiling of water uptake in (un)cracked and autonomously healed cementitious materials

(2016) MATERIALS. 9(5).
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Abstract
Given their low tensile strength, cement-based materials are very susceptible to cracking. These cracks serve as preferential pathways for corrosion inducing substances. For large concrete infrastructure works, currently available time-consuming manual repair techniques are not always an option. Often, one simply cannot reach the damaged areas and when making those areas accessible anyway (e.g., by redirecting traffic), the economic impacts involved would be enormous. Under those circumstances, it might be useful to have concrete with an embedded autonomous healing mechanism. In this paper, the effectiveness of incorporating encapsulated high and low viscosity polyurethane-based healing agents to ensure (multiple) crack healing has been investigated by means of capillary absorption tests on mortar while monitoring the time-dependent water ingress with neutron radiography. Overall visual interpretation and water front/sample cross-section area ratios as well as water profiles representing the area around the crack and their integrals do not show a preference for the high or low viscosity healing agent. Another observation is that in presence of two cracks, only one is properly healed, especially when using the latter healing agent. Exposure to water immediately after release of the healing agent stimulates the foaming reaction of the polyurethane and ensures a better crack closure.
Keywords
neutron radiography, capillary water absorption, mortar, cracks, autonomous self-healing, encapsulated polyurethane, viscosity

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Citation

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Chicago
Van den Heede, Philip, Bjorn Van Belleghem, Natalia Mariel Alderete, Kim Van Tittelboom, and Nele De Belie. 2016. “Neutron Radiography Based Visualization and Profiling of Water Uptake in (un)cracked and Autonomously Healed Cementitious Materials.” Materials 9 (5).
APA
Van den Heede, P., Van Belleghem, B., Alderete, N. M., Van Tittelboom, K., & De Belie, N. (2016). Neutron radiography based visualization and profiling of water uptake in (un)cracked and autonomously healed cementitious materials. MATERIALS, 9(5).
Vancouver
1.
Van den Heede P, Van Belleghem B, Alderete NM, Van Tittelboom K, De Belie N. Neutron radiography based visualization and profiling of water uptake in (un)cracked and autonomously healed cementitious materials. MATERIALS. MDPI AG; 2016;9(5).
MLA
Van den Heede, Philip et al. “Neutron Radiography Based Visualization and Profiling of Water Uptake in (un)cracked and Autonomously Healed Cementitious Materials.” MATERIALS 9.5 (2016): n. pag. Print.
@article{8524139,
  abstract     = {Given their low tensile strength, cement-based materials are very susceptible to cracking. These cracks serve as preferential pathways for corrosion inducing substances. For large concrete infrastructure works, currently available time-consuming manual repair techniques are not always an option. Often, one simply cannot reach the damaged areas and when making those areas accessible anyway (e.g., by redirecting traffic), the economic impacts involved would be enormous. Under those circumstances, it might be useful to have concrete with an embedded autonomous healing mechanism. In this paper, the effectiveness of incorporating encapsulated high and low viscosity polyurethane-based healing agents to ensure (multiple) crack healing has been investigated by means of capillary absorption tests on mortar while monitoring the time-dependent water ingress with neutron radiography. Overall visual interpretation and water front/sample cross-section area ratios as well as water profiles representing the area around the crack and their integrals do not show a preference for the high or low viscosity healing agent. Another observation is that in presence of two cracks, only one is properly healed, especially when using the latter healing agent. Exposure to water immediately after release of the healing agent stimulates the foaming reaction of the polyurethane and ensures a better crack closure.},
  articleno    = {311},
  author       = {Van den Heede, Philip and Van Belleghem, Bjorn and Alderete, Natalia Mariel and Van Tittelboom, Kim and De Belie, Nele},
  issn         = {1996-1944},
  journal      = {MATERIALS},
  keywords     = {neutron radiography,capillary water absorption,mortar,cracks,autonomous self-healing,encapsulated polyurethane,viscosity},
  language     = {eng},
  number       = {5},
  publisher    = {MDPI AG},
  title        = {Neutron radiography based visualization and profiling of water uptake in (un)cracked and autonomously healed cementitious materials},
  url          = {http://dx.doi.org/10.3390/ma9050311},
  volume       = {9},
  year         = {2016},
}

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