mci lab & field testing andrea hansen jessi meyer matt drew

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