Hydrophobic Treatments as Preventive or Restorative Methods against Reinforced Concrete Deterioration

Memoria tratta da "The New Boundaries of Structural Concrete: Session A – Performance and Life-Cycle Costs of New Concrete Structures", ACI IC - Ancona 2011

The effectiveness of bulk hydrophobic treatment of concrete against corrosion of galvanized steel reinforcement in specimens was compared with that of surface treatment, even in the presence of cracks 0.5 and 1 mm wide in the concrete cover. In this case surface hydrophobic treatment was applied both before and after cracking as a preventive and a restorative method against reinforced concrete deterioration. The results were obtained in terms of water absorption, electrochemical measurements, chlorides penetration, and visual observations. Tests were carried out on reinforced concrete specimens during the exposure to wetting and drying cycles in 10% NaCl solution. Test data analysis show that bulk hydrophobic treatment of concrete is the most effective treatment in improving the corrosion resistance of galvanized steel reinforcements in concrete, including in the presence of cracks. Surface hydrophobic treatment is very effective in the first few exposure cycles to the aggressive environment. When it was used as a restorative method, it was able to cancel the deleterious effect of cracks only 0.5 mm wide.

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