Resistance of cracked concrete to chloride attack
Maes, M.; De Belie, N. (2013). Resistance of cracked concrete to chloride attack. Paper from the Proceedings of the Third International Conference on Sustainable Construction Materials and Technologies. SCMT: Kyoto. 10 pp.
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Document type: Conference paper
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| Keyword |
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| Author keywords |
migration, chloride penetration depth, chlorides, Concrete, cracks |
| Abstract |
Generally, it is assumed that cracks influence the durability of concrete negatively by accelerating the penetration of aggressive elements. One of those elements are chlorides, present in marine environments. In this research, the effect of the crack width on chloride penetration is investigated by means of non-steady state migration tests based on NT Build 492. Therefore, ordinary Portland cement-, high sulphate resistant- and slag concrete are used. The cracks are formed by means of steel plates with widths of 0.1, 0.2 and 0.3 mm. After the migration test, migration coefficients and penetration depths are obtained. It seems that a crack width of 0.1 mm already has an influence on chloride penetration. Nevertheless, the biggest changes are measured for a crack width of 0.3 mm. The migration coefficient at the 0.3 mm crack tip increases 47 % compared to the migration coefficient at the exposed surface, regardless the concrete type. |
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