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Electrokinetic Hardening of Concrete Structures

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

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  1. 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

  2. Problematic crack Portion of structure removed Patch material filling void in structure Concrete structure Crack Repair of Concrete

  3. 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

  4. Power Supply V Negative Electrode Positive Electrode Repair Interface Side View EndView Electrokinetic Nanoparticle Repair I Repair Electrode

  5. Treatment Impact on Interface Strength Strength Increase Factor (SIF) = Treated Repair = 2.5 Untreated Repair Strength Reduction Factor (SRF) = Undamaged = 3.5 Untreated Repair

  6. 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

  7. 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

  8. 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

  9. Acknowledgements Entergy, Charles Turk Daniela Maindardi, Jinko Kanno, James Philips, Israel Popoola, Kunal Kupwade-Patil, Mark Castay, Joshua Alexander, Paul Femmer.

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