From Deterioration to Durability
How One Bridge Gained Strength, Protection, and Time
The Problem: Aging Infrastructure Under Attack
In the mid-1990s, the Pennsylvania Turnpike faced a challenge that still defines infrastructure today:
Reinforced concrete bridge decks showing early signs of corrosion and deterioration
Exposure to chlorides, moisture, and freeze-thaw cycles
Increasing pressure to extend service life without costly replacement
At Bridge EB-526 over Sandy Hill Road, deterioration had begun beneath an asphalt overlay—hidden, but advancing.
The Strategy: Treat the Concrete Itself
Instead of relying solely on surface barriers, the Turnpike evaluated a different approach:
Modify the concrete internally
Stop corrosion at its source
Densify, strengthen, and protect simultaneously
SURTREAT™ TPS II was selected as the core technology.
What Makes SURTREAT Different?
SURTREAT is not a coating. It is a penetrating, ion-exchange technology that transforms concrete from within.
Once applied, it:
Inhibits water, salt, air, and contaminant intrusion
Migrates in ionic form to reinforcing steel
Forms a stable, long-term passivating layer on rebar
Restores and maintains high alkalinity (pH)
Converts active corrosion into stable, inert compounds
Densifies the matrix, reducing porosity and microcracking
Scope of Work (Real-World Application)
The rehabilitation strategy combined surface prep, internal treatment, and system protection:
Removal of asphalt overlay and milling of deck
Cleaning to open pores and remove contaminants
Two applications of SURTREAT™ TPS II
Application of SURTREAT™ REPEL (up to 97% water reduction)
Crack repair with urethane elastomer
Installation of waterproof membrane and asphalt overlay
Key Insight:
SURTREAT was applied before the membrane—providing redundant protection if the membrane fails.
Measured Performance: The Data Engineers Care About
1. Strength Increase (CAPO Pull-Out Test)
Before: 3,215 psi
After: 5,038 psi
Gain: +1,823 psi
Significant structural improvement in existing concrete—not new placement.
2. Water Permeability Reduction
Before: 2.5 cc/min
After: 0.05 cc/min
Improvement:98% reduction
Near-elimination of fluid ingress pathways.
3. Corrosion Potential (Half-Cell Testing)
Before Average: -243 mV (corrosive range)
After Average: -168 mV (non-corrosive range)
Electrochemical state of steel shifted from active corrosion to passive.
4. pH Restoration (Carbonation Reversal)
Carbonated zone: pH 8–9 → increased to 11.5
Concrete chemistry restored toward protective alkalinity.
5. Acid Resistance
Before: Active etching and reaction
After:No reaction
Surface became chemically stable and resistant.
6. Water Repellency System Performance
Internal densification (TPS II) + surface tension reduction (Repel)
Creates a dual-layer defense system
Why This Case Study Matters Today
This project demonstrated something most repair strategies still miss:
Concrete failure is internal before it is visible.
Traditional systems:
Seal the surface
Hope deterioration slows
SURTREAT approach:
Stops the cause
Strengthens the structure
Extends service life dramatically
Engineering Takeaway
SURTREAT transforms deteriorating concrete into a higher-performing material—without removal, replacement, or structural disruption.
This is especially powerful for:
Bridge decks and DOT infrastructure
Parking structures
Marine and coastal structures
Condominium balconies and slabs
Industrial and utility assets
Lifecycle Value
Extends service life 20+ years
Reduces maintenance cycles
Provides redundancy with membranes and coatings
Minimizes capital replacement costs
Closing Thought
The most expensive concrete repair is the one done too late.
SURTREAT allows owners and engineers to intervene early—and change the trajectory of deterioration entirely.
Let’s Talk About Your Structures
If you’re evaluating:
Bridge rehabilitation programs
Concrete durability strategies
Long-term asset preservation