I-99 Corrosion Study
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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

(Pictures in this presentation were taken from Corvib, NDT James & Fisher Scientific Websites)


Objectives
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


Corrosion in concrete

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


Concrete resistivity
Concrete Resistivity

  • Related to the conductivity of concrete

  • Defined by:

    • Pore Structure

    • Concrete Moisture

    • Concrete Composition

  • High Resistivity Benefits

    • Concrete Diffusion

    • Cathodic Current


Concrete resistivity1
Concrete Resistivity

Ammeter

Testing Mechanism

Alternating

Current Supply

Voltmeter

~

I

V

Electrodes

S

S

S

Current Flow Lines

Equipotential Surface


Concrete resistivity2
Concrete Resistivity

Types of Equipment

NDT James RM-8000

Resistivity Meter

Corvib RESI

Resistivity Meter

NDT James GeCor 6 – Sensor B


Concrete resistivity values
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


Corrosion equipment
Corrosion Equipment

NDT James GeCor 6

3 Linear Polarization

Sensor A

Corvib CANIN

Corrosion Potential


Corrosion values

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


Environmental factors
Environmental Factors corrosion for a Copper-Copper Sulfate Reference Electrode

  • Relative Humidity

  • Moisture

  • Temperature

  • Hygrometer Pen

  • Moisture Meter

  • GeCor 6 – Sensor B


Other tests
Other Tests corrosion for a Copper-Copper Sulfate Reference Electrode

  • Chloride Permeability – ASTM 1202

  • Acid Soluble Chloride Penetration – AASHTO T260


Corrosion test setup
Corrosion Test Setup corrosion for a Copper-Copper Sulfate Reference Electrode

  • 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


Ponding cycles
Ponding Cycles corrosion for a Copper-Copper Sulfate Reference Electrode

  • 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


Testing performed

Corvib Resistivity on Slab corrosion for a Copper-Copper Sulfate Reference Electrode

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


Mix identification
Mix Identification corrosion for a Copper-Copper Sulfate Reference Electrode

  • 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


28 day results

م corrosion for a Copper-Copper Sulfate Reference Electrode

(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


Current trends

PC100 CHAMBER corrosion for a Copper-Copper Sulfate Reference Electrode

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


Questions
Questions corrosion for a Copper-Copper Sulfate Reference Electrode

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