The Wexford Bridge. Group 17 Vincent Carey Amy Fitzpatrick Patrick Gibbs Micheal McCarthey

History of the Bridge. Constructed: Location: The River Slaney, Co. Wexford. Span: 383m. Bridge Type: Prestressed Concrete Cantilever.

Why was the Bridge Replaced? Excessive Chloride Ion Content. Irreparable Structural Damage, to: –Concrete Reinforcement, – Prestressing Achors, –Lamination & Spalling.

What is Chloride Ingress? The Corrosion of Reinforcement Steel. How? 2 Stages in the Process. –First Stage: –Transport Within/Without to Reinforcement Areas –Due to Chloride Content in Water

What is Chloride Ingress? –Second Stage: –Destroys Protective Passivation Layer. –Provided Oxygen Present Starts to Corrode Bars –This is called “Pitting Corrosion”. –Causes Significant Mechanical Stress in Steel

Solution For Our Bridge? Damage to Extensive. Demolish and Rebuild. 10 Week Construction For New Bridge

New Bridge Continuous Steel Grider Deck Composite Concrete Slab Max Fabrication Off Site (time)

The New Wexford Bridge

How To Prevent Chloride Ingress in the New Bridge? OPC better then SRPC Temperature Of Cement Corrosion Inhibitors Hydropholic Treatment Paint For Exposed Steel(20 year Marine)

The End.