Abstract
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.
Highlights
Bond cracks are a form of damage that can occur in concrete around rebar, which were reported byGoto [1]
Air permeability coefficients of all specimens before the tensile loading were extremely similar near 0.1 × 10−16 m2
It seems that recovery of micro cracks along rebar occurred during water recuring
Summary
Bond cracks are a form of damage that can occur in concrete around rebar, which were reported by. The bond cracks may accelerate the penetration of substances such as water and gas, and it makes the rebar corrosion area wider. These micro cracks should be repaired before significant damage develops. Focus was placed on this phenomenon as a repair method, but the applicability of autogenous healing is limited because several required circumstances must be satisfied for autogenous healing to occur. These circumstances include the mix proportion of cementitious materials, presence of water, crack width, water pressure, and stability of the crack, etc. Observation of crack patterns using ink injection visually showed the amount of area recovered by the autogenous healing process
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