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A platform for research: civil engineering, architecture and urbanism
Relationship between Reinforcing Bar Corrosion and Concrete Cracking
This article presents results of an investigation on the relationship between reinforcement corrosion rust growth at the concrete-steel interface and cracking of concrete cover, based on study of laboratory specimens containing various amounts of chloride ions. The corrosion depth of steel bars to cause cover cracking (critical depth) was found to vary from 5 μm (0.2 mil) for 24 mm (0.9 in.) bar under 25 mm (1 in.) cover, to 150 μm (5.9 mil) for 6 mm (0.2 in.) bar under 73 mm (2.9 in.) cover. The steel corrosion rate was found to be closely related to the amount of chloride in concrete. The applicability of existing equations on cover cracking is assessed and a new mathematical equation is proposed. The predicted critical corrosion depth by the equation matched with the experimental data reasonably well. A mathematical equation has been proposed for calculation of the time-to-cracking, which uses this model in combination with the law of chloride diffusion in concrete.
Relationship between Reinforcing Bar Corrosion and Concrete Cracking
This article presents results of an investigation on the relationship between reinforcement corrosion rust growth at the concrete-steel interface and cracking of concrete cover, based on study of laboratory specimens containing various amounts of chloride ions. The corrosion depth of steel bars to cause cover cracking (critical depth) was found to vary from 5 μm (0.2 mil) for 24 mm (0.9 in.) bar under 25 mm (1 in.) cover, to 150 μm (5.9 mil) for 6 mm (0.2 in.) bar under 73 mm (2.9 in.) cover. The steel corrosion rate was found to be closely related to the amount of chloride in concrete. The applicability of existing equations on cover cracking is assessed and a new mathematical equation is proposed. The predicted critical corrosion depth by the equation matched with the experimental data reasonably well. A mathematical equation has been proposed for calculation of the time-to-cracking, which uses this model in combination with the law of chloride diffusion in concrete.
Relationship between Reinforcing Bar Corrosion and Concrete Cracking
Aimin Xu (author) / Ahmad Shayan
ACI materials journal ; 113
2016
Article (Journal)
English
Relationship between Reinforcing Bar Corrosion and Concrete Cracking
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