Rehabilitation of I95 Bridges 11 Bridges Along I95

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

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

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

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

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

Construction Sequence

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

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

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

Construction Sequence Placing PCU Aligning PCU & then Disconnecting

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

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

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

SCS’s Role in 11 Bridges Constructed in 1950’s (60 years old) Heavy traffic corridor Full replacement: costly, disruptive

Corrosion Cost Progression Cost of Maintenance Potential Failure Damage Accelerates Critical Point First Visible Damage Internal Damage Good Preserve Fair Extend Life Poor: Replace Condition of Structure

Temporary Piers

Corrosion Damage

Evaluation 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…

Boulevard - Structure Total Rebar Cover Histogram 120 80 60 40 20 Rebar Cover (Inches to Top of Rebar) e or M 5 75 4. 25 4. 4 75 3. 25 3. 3 75 2. 25 2. 2 75 1. 25 1. 1 75 0. 25 0 0. Frequency (# of Samples) 100

Boulevard - Structure Total Chloride Concentration Histogram

Abutment Wall Line Scan 29 Line Scan 28

GPR – Good Concrete

GPR – Delam. Concrete

Conclusions Visible concrete damage – significant increase ØDeveloped 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

Recommendations 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 Sacrificial CP on the rest of the bridges Sprayed Zinc – widely used, easy to apply

Repair cost Cost Savings Repair cost/ Replacement cost, % S. No. Structure Replacement cost 1 Boulevard $1, 931, 202 $402, 300 $1, 528, 902 21% 2 Hermitage Road $3, 240, 312 $619, 720 $2, 620, 592 19% 3 Laburnum Avenue $1, 730, 258 $380, 480 $1, 349, 778 22% 4 Lombardy/CSX $5, 821, 420 $2, 019, 420 $3, 802, 000 35% 5 Overbrook Road $1, 147, 005 $312, 240 $834, 765 27% 6 Ramp-A $926, 000 $146, 440 $779, 560 16% 7 Robin Hood Road $1, 877, 817 $568, 560 $1, 309, 257 30% 8 Sherwood Avenue $1, 595, 045 $397, 700 $1, 197, 345 25% 9 Upham Brook Run $2, 287, 719 $429, 620 $1, 858, 099 19% 10 Westwood Avenue $3, 592, 000 $402, 440 $3, 189, 560 11% Total $24, 148, 778 $5, 678, 920 $18, 469, 858 24%