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PI: Tyson D. Rupnow, Ph.D., P.E. Co PI: Patrick Icenogle, E.I.

Mark Morvant P.E. RAC Meeting July 2011. Evaluation of Surface Resistivity Measurements as an Alternative to the Rapid Chloride Permeability Test for Quality Assurance. PI: Tyson D. Rupnow, Ph.D., P.E. Co PI: Patrick Icenogle, E.I. Background.

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PI: Tyson D. Rupnow, Ph.D., P.E. Co PI: Patrick Icenogle, E.I.

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  1. Mark Morvant P.E. RAC Meeting July 2011 Evaluation of Surface Resistivity Measurements as an Alternative to the Rapid Chloride Permeability Test for Quality Assurance PI: Tyson D. Rupnow, Ph.D., P.E. Co PI: Patrick Icenogle, E.I.

  2. Background • Permeability specifications required by LADOTD for LRFD designed bridges • ASTM C 1202 most widely accepted test • Surface resistivity test • Florida DOTD study • AASHTO round robin study (on-going) • LTRC study • Wider range of w/c ratios

  3. Background • ASTM C 1202 • Sample preparation • 2 days of ‘testing’ • Equipment cost

  4. Background • Wenner Probe • Much quicker • Lower equipment cost • Shorted curing time • Portable!

  5. Research Objectives • Characterize surface resistivity of concrete produced at LTRC and in field conditions • Characterize the rapid chloride permeability of the same specimens • Comparative testing • Caminada Bay Bridge Project • I-10 Twin Spans Bridge Project • LA 1 Bridge Project

  6. Work Plan • Measure surface resistivity and RCP on varying ages of samples • Ages of 14, 28, and 56 days • Sample size = 4 in. x 8 in. cylinders • Over 220 test results

  7. Results – Overall Relationship

  8. Conclusions • SR measurements correlate well with RCP across a wide range of values and ages • Deviations are low • Able to identify great differences in w/cm • User friendly • Save $$$

  9. Recommendations • Test at 28-days of age • Purchase 11 SR meters • Training program • Develop TR procedure

  10. Cost:Benefit

  11. Cost:Benefit • Total cost of the research & Implementation • Research: $102,878 • Equipment Purchase: $30,000 (11 meters) • Estimated 1 year savings • DOTD - $96,000 • Contractors: $1.5 million

  12. Implementation Strategy • Training • Step-by-step of TR procedure and template • Training video • Hands on with equipment • Automated template • LTRC certification • Demonstration Projects • Equipment purchased for each district • Cost/Benefit Validation • Implementation Report

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