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

在2022财年，对防水剂处理后的修补材料的渗水、氯离子迁移以及其收缩和强度性能进行了实验研究。结果表明，疏水处理与修补材料相结合，有效地提高了裂解条件下的耐水性和耐氯离子渗透性。经过处理的修补材料的收缩也有所减少，但强度的降低仍然是未来需要解决的问题。此外，还测试了不同界面处理和混凝土去除工艺下修补材料与混凝土基材的粘结强度。针对修补混凝土的钢筋锈蚀问题，试验了修补材料裂缝宽度对钢筋锈蚀的影响。结果表明，随着裂纹宽度的增加，腐蚀程度增加，加速了氯离子的渗透。

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.