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Electrokinetic Hardening of Concrete Structures. Dr. Henry E. Cardenas, Ph.D. Jack T. Painter Professor of Civil Engineering Associate Professor of Mechanical and Nanosystems Engineering Director, Applied Electrokinetics Laboratory. Problematic crack. Portion of structure removed.

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electrokinetic hardening of concrete structures
Electrokinetic Hardeningof Concrete Structures

Dr. Henry E. Cardenas, Ph.D.

Jack T. Painter Professor of Civil Engineering

Associate Professor of Mechanical and Nanosystems Engineering

Director, Applied Electrokinetics Laboratory

crack repair of concrete

Problematic crack

Portion of structure removed

Patch material filling void in structure

Concrete structure

Crack Repair of Concrete
crack repair strength test

14“

Repaired specimen loaded in 3rd point bending.

7

4

Bend test specimen with center crack.

Crack cut open and replaced by repair patch.

Crack Repair Strength Test
electrokinetic nanoparticle repair

Power Supply

V

Negative Electrode

Positive Electrode

Repair Interface

Side View

EndView

Electrokinetic Nanoparticle Repair

I

Repair Electrode

treatment impact on interface strength
Treatment Impact on Interface Strength

Strength Increase Factor (SIF) = Treated Repair = 2.5

Untreated Repair

Strength Reduction Factor (SRF) = Undamaged = 3.5

Untreated Repair

treatment enhancement

Repair Electrode

Top Surface

Patch Interface

Treatment Enhancement
  • Build up nanoparticles right at patch interface
  • Increase bond strength between patch material and original concrete structure

This worked very Poorly!

  • Additional Stress, x3 (next to electrode)
  • Interface SRF ~ 3.5
  • Top surface has the highest stress

Lots of room to Optimize: Porosity reduction at patch may enhance strength by factor of 9

treatment optimization

Repair Electrode

Patch Interface

Top Surface

Treatment Optimization
  • Place treatment electrode off of patch interface
  • Place the electrode away from top surface
  • Optimize electrode location
optimum electrode placement

3.0

2.85

Patch Interface

2.7

y

Satisfactory region

0.0

x

0.0

0.48

0.85

1.0

Optimum Electrode Placement

Top Surface

Unsatisfactory electrode placement region

Center of Repair Patch

acknowledgements
Acknowledgements

Entergy, Charles Turk

Daniela Maindardi,

Jinko Kanno,

James Philips,

Israel Popoola,

Kunal Kupwade-Patil,

Mark Castay,

Joshua Alexander,

Paul Femmer.