Concrete Durability Enhancement -Corrosion Control

Presented By: Usama Jacirujacir@cortec-me.comhttps://www.linkedin.com/in/usama-jacir/

Can we build timeless cities?

Working Life Considerations

• Functional

• Economic

• Technical

2

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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4

https://www.youtube.com/watch?v=kunTlcruqNo&t=14s

EN 206-1 Design Methods

Limiting Value Method(Prescriptive)

Performance-related Method

5

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

8

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

10

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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