pi: tyson d. rupnow, ph.d., p.e. co pi: patrick icenogle, e.i
DESCRIPTION
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. - PowerPoint PPT PresentationTRANSCRIPT
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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.
Mark Morvant P.E.RAC Meeting
July 2011
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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
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Background
ASTM C 1202 Sample
preparation 2 days of ‘testing’ Equipment cost
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Background
Wenner Probe Much quicker Lower equipment cost Shorted curing time Portable!
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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
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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
Mixture IDw/c
0.35 0.50 0.65100TI X X X80TI-20C X X X50TI-50G120S
X X X
90TI-10SF X X X95TI-5SF X X X
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Results – Overall Relationship
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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 $$$
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Recommendations
Test at 28-days of age
Purchase 11 SR meters
Training program Develop TR
procedure
Permeability Class
28-Day Surface Resistivity
(kΩ-cm)
High < 12
Moderate 12 - 21
Low 21 - 37
Very Low 37 - 254
Negligible > 254
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Cost:Benefit
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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
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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