Modeling and re-corrosion evaluation of patch repaired concrete subjecting to chloride attack

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In FY2022, water penetration and chloride migration of repair materials that were treated with water repellent agents, as well as their shrinkage and strength properties, were studied experimentally. The results indicated that the combination of hydrophobic treatment with repair materials effectively improved water and chloride penetration resistance under cracked conditions. Shrinkage was also reduced for treated repair materials, but the reduction of strength still remains an issue that needs to be solved in the future. In addition, bond strength of repair material and concrete substrate was also tested with different interfacial treatment and concrete removal technology. For the steel corrosion of patch repaired concrete, the influence of crack width in repair materials has also been tested. It was found that corrosion degree increased with increasing crack width, which accelerated chloride penetration significantly.