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MCI Lab & Field TestingAndrea Hansen
Jessi MeyerMatt Drew
Agenda
• Lab Testing– ASTM G109– Modified ASTM
G109 (Cracked Beam Test)
– GC– XPS
• Field Testing– Wet Mix Testing– Alkalinity– QAC– XPS– GalvaPulse
(others)– Fugitive Dye
Option
ASTM G109
• Standard test method for determining the effects of chemical admixtures on the corrosion of embedded steel reinforcement in concrete exposed to chloride environments.
Total Corrosion, Amine Carboxylate Vs. CNI
0500
10001500
200025003000
35004000
450050005500
600065007000
75008000
850090009500
1000010500
110001150012000
1250013000
1350014000
1 5 9 13
17
21
25
29
33
37
41
45
49
53
57
61
65
69
Ponding Cycle
To
tal
Co
rro
sio
n (
Co
ulo
mb
s)
Control
MCI-2006
DCI 4 Gal
Cracked Beam Testing
• Modified ASTM G109• Includes crack as part of initial test set
up• More true to “real life”• More aggressive/faster test method
Cracked Beam Testing of Corrosion Inhibitors
0
100
200
300
400
500
600
700
800
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20
Test Cycle
To
tal
Co
rro
sio
n,
Co
ulo
mb
s
Control
MCI 1.5 pints
DCI 4 Gal
222+ 1 Gal
Gas Chromatography (GC)
• A separation technique carried out in a packed column.
• Each peak on the recorder signifies a certain chemical.
Gas Chromatography (GC)
X-Ray Photoelectron Spectroscopy
• Performed on:– MCI 2020– MCI 2020 M– MCI 2022– MCI 2021
• Shows MCI actually absorbed onto steel reinforcement
• Confirmed ability of MCI to displace chlorides.
MCI Slides
XPS analysis after 450 days, Mass Concentration %
SampleEtch Time(seconds)
Fe 2p O 1s C 1s N 1s Cl 2p Ca 2p Si 2p
Untreated 0 6.27 42.71 30.67 0.19 1.07 14.19 4.97
Untreated 120 13.60 39.43 23.08 0.14 1.06 17.59 5.19
Untreated 240 14.65 38.77 22.35 0.11 1.01 18.18 5.03
Inhibitor A 0 2.30 42.22 29.90 1.16 0.95 17.28 6.26
Inhibitor A 120 2.53 43.01 25.17 1.12 0.93 20.14 7.18
Inhibitor A 240 2.56 43.85 21.95 1.05 1.40 22.19 7.09
Inhibitor B 0 2.02 40.20 38.55 1.32 0.87 11.54 5.53
Inhibitor B 120 2.22 41.74 32.13 1.29 0.86 15.41 6.42
Inhibitor B 240 2.82 43.61 28.99 1.15 0.83 15.92 6.68
Detection of NS Admixtures in Wet
Concrete• HACH Silica Test Kit
– Model SI-5, Ranges 0-40 and 0-800mg/L
• “Wet samples” of concrete – Control– MCI-2005 NS or
MCI-2006 NS
Gecor 6 - James Instruments
• Measures RH, temp, HCP, and concrete resistivity
• Non-destructive polarization technique• 100 readings can be stored at a time• Weighs 9 pounds
Photo from James Instruments Inc Website
GalvaPulse - Germann Instruments
• Linear Polarization Resistance
• Half Cell Potentials
• Smaller and faster than Gecor 6
Galva Pulse
Photo from Galva Pulse Manual
Galva Pulse
Corrosion
Current,µA/cm2
CorrosionRate,
µm/year
CorrosionLevel
Time to VisibleDeterioration
< 0.5 < 5.8 Passive N/A
0.5 to 5 5.8 to 58 Low > 10 years
5 to 15 58 to 174 Moderate 3 to 10 years
> 15 >174 High < 2 years
Corrosion rates by Thomas Frolund, 2002(with GalvaPulse instrument)Chart from GalvaPulse
Manual
LPR Corrator Probes - Rohrback Cosasco Systems
Photo from Corrator Website
• Linear Polarization Resistance
• Electrical Resisitivity
• Temperature sensor
Model 800 Monitoring Devices
Photos from Corrator Website
• Monitor via small test instruments or remote data collection
• More Automated CorrData Instruments
Humidity Testing
• ASTM-F-1869• ASTM-F-2170• ASTM-D-4263
Photo from James Instruments Website
Depth of Carbonation
• Deep Purple Indicator, German Instruments, Inc.
• Rainbow Indicator, Germann Instruments, Inc
Photos from German Instruments Website
Depth of Carbonation
• James Instruments, Inc.• Carbo Detect• ASR Detect
Photo taken from German Instruments Website
Sample Preparation
Alkalinity
• HACH Alkalinity Test – Model AL-AP MG-
L– 5-400 mg/L– Catalog #2443-01
• Alkalinity Treated > Alkalinity Control
QAC Test
• EM Quant Test Strips– 0-500 mg/l– Cat. #17920-1
Equipment & Test Firms• Test Firms• American
Engineering & Testing, MN
• H.C. Nutting, OH• CTL, IL, MD, NH• WJE, 20 Offices
• NDT Equipment• Germann
Instruments• James Instruments• Durham Geo Slope
Indicator• Elcometer
Instruments• Humboldt
Manufacturing