Research on nanoscale deep penetration sealer protection for enhancing chloride erosion resistance of reinforced concrete

This study evaluates the chloride resistance of reinforced concrete protected by a Nanoscale Deep Penetration Sealer (NDPS). Indoor chloride natural diffusion tests and accelerated steel corrosion tests were conducted. Chloride concentration profiles, apparent corrosion conditions, steel corrosion rates, and surface chloride concentrations were compared across specimens treated with different NDPS spraying dosages. These comparisons assessed the effectiveness of NDPS in improving chloride resistance. Based on Fick’s second law of diffusion, a one-dimensional chloride diffusion prediction model that incorporates NDPS spraying dosage was developed through regression analysis of measured chloride distribution data. Results indicate that NDPS protection significantly enhances the chloride resistance of reinforced concrete. The ability of NDPS to inhibit chloride ingress and delay corrosion progression increases with higher spraying dosages, demonstrating its suitability for concrete surface protection. The proposed prediction model accurately represents chloride concentration distributions under varying NDPS dosages and exposure durations.