1. Superstructure Replacement Substructure Repair Rehabilitation of I-95 Bridges 11 Bridges Along I-95 Corridor 10 9 8 7 5 1 2 3 4 6

2. ROLLED BEAMS  Existing deck is 7-1/2” thick  Replacement deck creates overstress in beams  Category E fatigue detail at cover plate ends  Paint is in poor condition and lead based  Replace steel beams

3. Lombardy/CSX Bridge 12’ Shoulders (8’-8” Widening Each Side) Robin Hood Rd. Bridge Ramp Extension (14’-8” Widening SBL) Sherwood Ave. Bridge Ramp Extension (14’-8” Widening SBL) Rehabilitation of I-95 Bridges Bridge Widening

4. Preconstructed Composite Units (PCU) Rehabilitation of I-95 Bridges Superstructure Replacement

5. PCU’s Chosen option uses Pre-Constructed Units assembled in a casting yard, trucked to site and lifted into place by cranes PCU Being Placed during early test day PCU ready in Casting Yard

6. Construction Sequence

8. Construction Sequence Setup of Maintenance of Traffic Traffic Shifting Traffic waiting to Shift Moveable Traffic Barrier Setup Initiating MOT

9. Construction Sequence Preparation for PCU Repair Bearing Pads Cut Deck and Diaphragms and remove Existing Repaired Pier Cap

10. Construction Sequence Preparation & Installation Moving PCU to Pick up Point Placement of PCU

11. Construction Sequence Placing PCU Aligning PCU & then Disconnecting

12. Match-Cast Longitudinal Joint Cast-in-Place Closure Pour Highly Skew Bridges Lombardy / CSX Robin Hood Hermitage Westwood Rehabilitation of I-95 Bridges

13. Surface Repairs at Abuts. & Piers Pier Cap Replacement 5 Piers for Lombardy/CSX Bridge Pier Cap Strengthening Infill Wall between Columns on Piers at Boulevard Bridge Rehabilitation of I-95 Bridges Substructure Repair

14. Cathodic Protection Chloride Extraction (ECE) Sealing Concrete Surfaces Pier Caps Rehabilitation of I-95 Bridges Substructure Repair

15. SCS’s Role in 11 Bridges

17. Condition of Structure Cost of Maintenance Internal Damage First Visible Damage Critical Point Damage Accelerates Potential Failure Corrosion Cost Progression

18. Temporary Piers

19. Corrosion Damage

21. How much delam/spall existed at the time? Chloride presence at various depths? Future penetration & effects of chlorides? Active corrosion occurring? How quickly? Existing and future damage? Presence and progression of ASR? High risk of prescribing a poor solution without proper diagnosis… Evaluation

26. Boulevard - Structure Total Chloride Concentration Histogram

27. Line Scan 28 Line Scan 29 Abutment Wall

28. GPR – Good Concrete

29. GPR – Delam. Concrete

32. Visible concrete damage – significant increase  Developed a concrete damage % for each element Average recorded cover – low Majority of potential readings – active corrosion High chloride readings behind rebars Near future concrete damage will result Significant weakening of the structure within five years Conclusions

33. Based on a unique methodology, we developed recommendations for repair / replace / life extension Concrete repair on all bridges ECE to lower the chloride concentration on certain bridges certain bridges Sacrificial CP on the rest of the bridges Sprayed Zinc – widely used, easy to apply Recommendations