Corrosion Monitoring of Reinforced Concrete Structures
A proper test plan should take into account the following considerations:
- Exposure condition (Access to moisture, oxygen, exposed to de-icing salts, other chemicals, carbon dioxide);
- Geometry of the structures and components;
- Access to structural and non-structural components;
- Dimension and scale of the area under investigation;
- Importance of the element, etc.
The following inspection procedures are widely used during a routine corrosion monitoring program:
Chain Drag Delamination Survey
Chain dragging is widely used to detect delamination in concrete bridge decks. The concept behind this very simple method is the unique hollow sound that is made by dragging chain across the delaminated surface. The test is used to identify potentially delaminated areas on the deck slab.
The practice is difficult when vehicles are moving over the deck, and distinguishing the hollow sound becomes difficult.
The main disadvantage of the chain dragging method is that they can only provide results if the defect and deterioration are in well advanced stages. Early diagnosis of damage mechanism is not possible using this technique. Application of the method is somewhat difficult during heavy traffic. Continue reading Corrosion Monitoring of Reinforced Concrete Structures