Bridges
Strengthening of Bridges
Concrete bridges, despite being very durable, are not immune to damage and require structural repairs for a variety of reasons:
- Environmental factors: Over time, exposure to rain, wind, and freezing temperatures can cause cracks and spalling (chipping) of the concrete surface. This is especially true in places with harsh winters where water repeatedly freezes and thaws within the concrete, causing it to expand and crack.
- Chemical degradation: Environment chemicals can seep into the concrete and cause corrosion of the steel reinforcement bars inside. This corrosion expands the steel, causing cracks in the concrete and weakening the structure.
- Overload and wear: The weight and constant vibration from heavy traffic can put stress on the bridge, leading to cracks and wearing down the concrete surface.
- Design and construction flaws: Sometimes, problems can arise from errors made during the design or construction of the bridge. For instance, inadequate concrete cover over the reinforcing steel can make it more susceptible to corrosion.
These issues, if left unattended can worsen and compromise the bridge’s structural integrity. Regular inspections and timely repairs are crucial to ensure the safety and longevity of concrete bridges, in the form of:
- Carbon fibre wrapping / laminates
- Epoxy mortar / Grouting
- Polymer modified mortar
- Anti carbonation coating.