Problem: Deterioration in the pre-stressed strands of the bridge coupled with extensive cracking and spalling of the concrete.
Task: To increase the life of both the bridges
Our Approach: A carbon fiber system was designed to restore the flexural strength of the beams and to optimize the high strength of the carbon fibers an innovative method for post-tensioning of carbon fibers was used which has been used only six times worldwide till then. In addition to strengthening all the affected beams, the bridge bearings were repaired and aligned, the deck drainage was redesigned and replaced, the deck was waterproofed, and a new wearing course was placed on the bridge. All the deteriorated concrete was removed and replaced with a polymer-modified repair mortar and the exposed mild steel was coated with an anticorrosion coating.
Repairing Advantage: Carbon fibers which were used were non-corrosive and very suited for moisture laden climate over bridge, the ability of repaired system to relieve strain from the existing tendons and the plates to be used can be attached to concrete beams by mechanical and chemical means.
Precaution and Monitoring: After the completion of the repairs, the two bridges will be monitored for a period of at least two years for load-rating, stress and strain patterns, and deflections to determine the long-term effectiveness of the repairs.
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