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Midterm presentation of Numerical Modeling of Reinforcement Corrosion in Cracked Concrete Prepared by: Anna Emilie A. Thybo Prepared for: Concrete Expert Centre Reference Group Closing Meeting, November 30, 2012

Midterm presentation of Numerical Modeling of ... presentation of... · Numerical model for the simulation of damage and cracking in concrete cover 3 Modeling non-uniform corrosion

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Page 1: Midterm presentation of Numerical Modeling of ... presentation of... · Numerical model for the simulation of damage and cracking in concrete cover 3 Modeling non-uniform corrosion

Midterm presentation of Numerical Modeling of Reinforcement Corrosion in Cracked Concrete

Prepared by: Anna Emilie A. Thybo

Prepared for: Concrete Expert Centre Reference Group Closing Meeting, November 30, 2012

Page 2: Midterm presentation of Numerical Modeling of ... presentation of... · Numerical model for the simulation of damage and cracking in concrete cover 3 Modeling non-uniform corrosion

• Modeling non-uniform corrosion

• Comparison of model, experimental data

• Influence of modeling non-uniform corrosion on surface crackning

• Input/output

• Future work

2

Outline

Page 3: Midterm presentation of Numerical Modeling of ... presentation of... · Numerical model for the simulation of damage and cracking in concrete cover 3 Modeling non-uniform corrosion

Numerical model for the simulation of damage and cracking in concrete cover

3

Modeling non-uniform corrosion

mean(icorr_uniform) = mean(icorr_nonuniform)

Page 4: Midterm presentation of Numerical Modeling of ... presentation of... · Numerical model for the simulation of damage and cracking in concrete cover 3 Modeling non-uniform corrosion

• Digital image correlation (DIC)

– 24.5 megapixel camera used for DIC during accelerated corrosion testing

– Each pixel corresponds to 7.8×7.8 mm2 of specimen surface

4

Comparison of model, experimental data

+-

Tap water

Steel bar

Reinforcedmortar specimen

Currentregulator

Activated titanium meshNon-conductive holders

Measured region

(Pease et al., 2012)

Page 5: Midterm presentation of Numerical Modeling of ... presentation of... · Numerical model for the simulation of damage and cracking in concrete cover 3 Modeling non-uniform corrosion

5

Comparison of model, experimental data - deformations

-6

-4

-2

0

2

4

6

-7 -2 3 8

mm

mm

Corrosion layer Reinforcement

Page 6: Midterm presentation of Numerical Modeling of ... presentation of... · Numerical model for the simulation of damage and cracking in concrete cover 3 Modeling non-uniform corrosion

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Comparison of model, experimental data – crack width 1.4 mm from reinforcement

Page 7: Midterm presentation of Numerical Modeling of ... presentation of... · Numerical model for the simulation of damage and cracking in concrete cover 3 Modeling non-uniform corrosion

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Influence of modeling non-uniform corrosion on surface crackning

Corrosion layer

Semi-infinite concrete body

Semi-infinite concrete body Semi-infinite concrete body

Corrosion layer

Corrosion layer

Semi-infinite concrete body

Corrosion layer

Reinforcement Reinforcement

Reinforcement Reinforcement

Crack Crack

Crack Crack

Scenario 1 Scenario 2

Scenario 3 Scenario 4

Page 8: Midterm presentation of Numerical Modeling of ... presentation of... · Numerical model for the simulation of damage and cracking in concrete cover 3 Modeling non-uniform corrosion

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Influence of modeling non-uniform corrosion on surface crackning

Scatter band

Page 9: Midterm presentation of Numerical Modeling of ... presentation of... · Numerical model for the simulation of damage and cracking in concrete cover 3 Modeling non-uniform corrosion

• INPUT – Material parameters (concrete, steel and corrosion

products)

– Geometrical parameters (incl location of corrosion products)

– Corrosion current density

– Time

• OUTPUT – Thickness of corrosion layer/reduction of steel area

– Crack width in concrete cover

9

Input/output

Page 10: Midterm presentation of Numerical Modeling of ... presentation of... · Numerical model for the simulation of damage and cracking in concrete cover 3 Modeling non-uniform corrosion

• Probabilistic modeling of non-uniform corrosion

– quantifying uncertainty

• Multiple cracking in the cross section

• Implementing penetration of corrosion products into cracks

10

Future work

0 1 2 3 4 5 6 7 8 9

Time (days)

-2

0

2

4

6

8

Cra

ck w

idth

(m

m)

Crack 1

Crack 2

Crack 3

'Dummy'Crack

(Pease et al., 2012) (Pease et al., 2006)

Page 11: Midterm presentation of Numerical Modeling of ... presentation of... · Numerical model for the simulation of damage and cracking in concrete cover 3 Modeling non-uniform corrosion

• Mechanical modeling

– initial defects

– debonding

11

Future work

CathodeCathode

Reinforcement

Concrete

OHeOHO 44

22

2

OHeOHO 44

22

2

Moisture, temperature, oxygen, chloride, carbon dioxide

eFeFe 2

2

Anode

(Michel et al., 2009)

Page 12: Midterm presentation of Numerical Modeling of ... presentation of... · Numerical model for the simulation of damage and cracking in concrete cover 3 Modeling non-uniform corrosion

• Coupling with other models

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Future work

(Michel et al.,

2010)

Microstructure

Temperature

Moisture Ions

Oxygen

Resistivity

Temperature

Moisture Oxygen

Cracking

Debonding

Properties

Material and transport models

Service life

prediction

Page 13: Midterm presentation of Numerical Modeling of ... presentation of... · Numerical model for the simulation of damage and cracking in concrete cover 3 Modeling non-uniform corrosion

Thank you for your attention

13

Page 14: Midterm presentation of Numerical Modeling of ... presentation of... · Numerical model for the simulation of damage and cracking in concrete cover 3 Modeling non-uniform corrosion

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Concrete body

Corrosion layer

Reinforcement