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Concrete Durability Enhancement -Corrosion Control
Presented By: Usama [email protected]://www.linkedin.com/in/usama-jacir/
Can we build timeless cities?
Working Life Considerations
• Functional
• Economic
• Technical
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Degradation Mechanisms
Salt crystallisation
Freezing - thawing attack
Abrasion, erosion and cavitation
Thermal damage
Leaching
Acid and base attack
Alkali-silica reactions
Delayed ettringite formation
Sulfate attack
Steel reinforcement corrosion
Physical attack
Chemical attack
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https://www.youtube.com/watch?v=kunTlcruqNo&t=14s
EN 206-1 Design Methods
Limiting Value Method(Prescriptive)
Performance-related Method
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Temperature Vs Corrosion
Corrosion rate doubles of a metal doubles for every 10°C increase in temperature. 10 mpy at 30°C, expect 20 mpy at 40°C
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0
5
10
15
20
25
30
1 2 3 4 5 6 7 8 9 10 11 12
TEM
PER
AT
UR
E ©
Average Daily Temperatures
London New York Jakarta Kuala Lumpur Singapore
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Service Life Modelling
Time
Loss o
f cro
ss-S
ection
Corrosion Threshold
O2
Cl-Cl-H2O O2
Cl-Cl-H2O
O2
Cl-Cl-H2O O2
Cl-Cl-H2O
O2
Cl-Cl-H2O O2
Cl-Cl-H2O
O2
Cl-Cl-H2O O2
Cl-Cl-H2O
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BS8500 Extended
Service Life
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Technical Report 61 by CS
Additional Protective Measures:
• Corrosion Inhibitors
• Epoxy-coated reinforcement
• Galvanized steel
• Stainless steel
• Non-metallic reinforcement
• Cathodic prevention
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ASTM C1582
Standard Specification
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11https://www.youtube.com/watch?v=kunTlcruqNo&t=14s
Concrete Crack Protection
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10 Year Study – interim results
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10 Year Study – interim results
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10 Year Study – interim results
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Field Study
0.00
2.00
4.00
6.00
8.00
10.00
12.00
2000 2002 2004 2006 2008 2010 2012
TIME (YEARS)
MCI-2000
Control
Time Vs Corrosion Rate
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Can we build timeless cities?We can by
• Performance-based durability design
• Adopting good concrete technology and practice
• Incorporate Additional Protective Measures
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