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I-99 Corrosion Study

I-99 Corrosion Study. (Pictures in this presentation were taken from Corvib, NDT James & Fisher Scientific Websites). Objectives. Evaluate Equipment Precision & Accuracy Compare Different Test Results Concrete Resistivity Half Cell Potential – ASTM 876 Corrosion Rate

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I-99 Corrosion Study

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  1. I-99 Corrosion Study (Pictures in this presentation were taken from Corvib, NDT James & Fisher Scientific Websites)

  2. Objectives • Evaluate Equipment Precision & Accuracy • Compare Different Test Results • Concrete Resistivity • Half Cell Potential – ASTM 876 • Corrosion Rate • Chloride Permeability – ASTM 1202 • Acid Soluble Chloride Penetration – AASHTO T260 • Environmental Factors • Analyze Design Factors

  3. Anode Reaction Fe – 2e Fe2+ Cathode Reaction 2H2O + O2 + 4e 4OH- Corrosion in Concrete H2O O2 O2 H2O Cl- Cl- Cl- Cl- Cl- Cl- Cl- Cl- OH- Cathode OH- Cathode rust rust Cl- Fe2+ e- e- Anode

  4. Concrete Resistivity • Related to the conductivity of concrete • Defined by: • Pore Structure • Concrete Moisture • Concrete Composition • High Resistivity Benefits • Concrete Diffusion • Cathodic Current

  5. Concrete Resistivity Ammeter Testing Mechanism Alternating Current Supply Voltmeter ~ I V Electrodes S S S Current Flow Lines Equipotential Surface

  6. Concrete Resistivity Types of Equipment NDT James RM-8000 Resistivity Meter Corvib RESI Resistivity Meter NDT James GeCor 6 – Sensor B

  7. Concrete Resistivity Values Guideline Values Concerning Concrete Resistivity (Multiple Published Sources) Corvib RESI Resistivity Meter NDT James RM-8000 Resistivity Meter *** p > 60 kΩ cm  Corrosion Impossible

  8. Corrosion Equipment NDT James GeCor 6 3 Linear Polarization Sensor A Corvib CANIN Corrosion Potential

  9. Guideline Values (ACI 222) to determine possibility of corrosion for a Copper-Copper Sulfate Reference Electrode mV vs. CSEProbability of Corrosion 0 to -200 > 90% No Corrosion -200 to -350 Uncertain Corrosion Activity Less than -350 > 90% Corrosive Activity Corrosion Values

  10. Environmental Factors • Relative Humidity • Moisture • Temperature • Hygrometer Pen • Moisture Meter • GeCor 6 – Sensor B

  11. Other Tests • Chloride Permeability – ASTM 1202 • Acid Soluble Chloride Penetration – AASHTO T260

  12. Corrosion Test Setup • Modified AASHTO T259 • 2’ x 2’ x 6” Slabs • 1” Clear Cover • 5/8” dia. Reinforcement Bar (#5) • Internal Thermal Couple • Two electrical connections to rebar • Different Rebar • Different Mixture Designs

  13. Ponding Cycles • Slabs ponded every 2 weeks • 3.0 % NaCl Salt Water Solution • Slabs kept indoors in semi-controlled environment • Temperature ranges: 18 to 28 C • Relative Humidity ranges: 20 to 60 % • Currently 17 different slabs • 38-69 pts. / Slab / Week Overall Picture of the lab

  14. Corvib Resistivity on Slab James Resistivity on Slab Corvib Cylinder Comparison James Cylinder Comparison Environmental Tests Internal Temperature External Temperature Relative Humidity Moisture Corvib Corrosion Potential (Baseline Values) GeCor 6 Corrosion Potential / Rate / Resistivity (B. V.) Testing Performed X X X 7 4 1 X X 10 12 X X X 8 2 5 X 11 X 13 2 feet X X X 9 3 6 X 2 feet

  15. Mix Identification • PC = Portland Cement • BS = Ground Granulated Blast Furnace Slag • FA = Fly Ash • IP = Ipanex • AQ = Aquron • CC = Centre Concrete Materials • NE = New Enterprise Materials • Numbers = Cementitious Percentages • Bar Type & w/c ratio also defined

  16. م (kΩcm) Corvib Resistivity - Slab Corvib Resistivity - Cylinder 100.0 90.0 1 = PC100/AQ/.54 80.0 2 = PC97SF3/AQ/.57 3 = PC100/IP/.43 70.0 4 = PC100/BlackBar 5 = PC100/Epoxy 6 = PC100/MMFX 60.0 7 = PC70FA27SF3/Black 8 = PC70FA27SF3/Epoxy 50.0 9 =PC70FA27SF3/MMFX 10 = PC70FA30 40.0 11 = PC65FA30SF5 12 = PC97SF3 30.0 13 = PC65BS35 14 = PC55BS42SF3 20.0 15 = NE PC 100 16 = NE PC55BS42SF3 10.0 17 = NE PC70FA27SF3 0.0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 Test # 28 day Results

  17. PC100 CHAMBER PC100 BLACK SLAB PC100 EPOXY SLAB PC100 MMFX SLAB PC70FA27SF3 CHAM. PC70FA27SF3 BLK SLB PC70FA27SF3 EPX SLB PC70FA27SF3MMFX SLB Current Trends CorvibComparison 100.0 90.0 80.0 70.0 60.0 Resistivity (kohm cm) 50.0 28 / 7 Strengths (slab, PI) PC 100 = 1.13, 1.19 40.0 PC70FA27SF3 = 1.46, 1.43 30.0 20.0 10.0 0.0 Wet 1 2 3 4 5 6 7 8 0 Wet Wet Test Number 14d 7d 14d 7d 14d

  18. Questions ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ?

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