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Materials 2014, 7(4), 3136-3146; doi:10.3390/ma7043136

Evaluation and Observation of Autogenous Healing Ability of Bond Cracks along Rebar

School of Architecture & Civil Engineering, Kyungpook National University, 80, Daehak-ro Buk-gu, Daegu 702-701, Korea
Department of Civil Engineering, Faculty of Engineering, Gifu University, 1-1 Yanagido, Gifu 501-1193, Japan
Author to whom correspondence should be addressed.
Received: 10 January 2014 / Revised: 22 March 2014 / Accepted: 11 April 2014 / Published: 17 April 2014
(This article belongs to the Special Issue Self-healing Concrete)
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Micro cracks occurring in concrete around tensile rebar is well known latent damage phenomenon. These micro cracks develop, and can be detected after reaching the surface of the concrete. Detection of these cracks before they are fully formed is preferable, but observing the whole crack structure is difficult. Another problem is repairing micro cracks under the concrete surface. The autogenous ability of bond cracks along rebar was evaluated using the air permeability test. Air permeability coefficients were measured before and after tensile loading, and experimental air permeability coefficients became larger near cracks along rebar as a result of tensile loading. Recuring for 28 days after tensile loading made the air permeability coefficients smaller, but this restriction only occurred during water recuring. Observation of crack patterns helped the understanding of change in the air permeability coefficients. Several small cracks along rebar were observed after tensile loading, and most cracks along rebar were not found after water recuring. On the other hand, the crack pattern did not change after air recuring. These results indicate that bond cracks along rebar can be closed by autogenous healing, and cause the air permeability coefficients. View Full-Text
Keywords: autogenous healing; bond cracks; air permeability test; crack pattern; ink injection autogenous healing; bond cracks; air permeability test; crack pattern; ink injection

This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).

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MDPI and ACS Style

Kang, C.; Kunieda, M. Evaluation and Observation of Autogenous Healing Ability of Bond Cracks along Rebar. Materials 2014, 7, 3136-3146.

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