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1 DURABILITY OF CONCRETE PROFESSOR DR MOHAMMAD BIN ISMAIL REINFORCEMENT SKAA 4163 MAKE 1153
1DURABILITY OF CONCRETE
PROFESSOR DR MOHAMMAD BIN ISMAIL
REINFORCEMENT
SKAA 4163 MAKE 1153
2
COMMUNICATION !
• At the end of the course student should be
able to understand
– Mechanism of corrosion of reinforcement
– Corrosion due chloride
– Corrosion due to carbonation
– Factors that influence
– Method of rectification
Learning Outcome
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References
1. Advanced Concrete Technology, concrete properties, J. Newman and B.S.Choo, Elsevier, 2003
2. Fundamentals of Durable Reinforced Concrete, M.G. Richardson, Spon Press, 2002
3. Corrosion of Steel in Concrete, L.Bertholini, B.Elsener, P.Pedeferri and R.Polder, Wiley-VCH, 2004
4. Durable concrete structures, CEB Design Guide, Thomas Telford, 1992
Corrosion of Reinforcement, Myth, Mystery or Reality Our role as Civil Engineer
Corrosion of Reinforcement, Myth, Mystery or Reality Our role as Civil Engineer
INAUGURAL PROFESSOR LECTURE
MOHAMMAD ISMAILFaculty of Civil Engineering,
Universiti Teknologi Malaysia, 81310 UTM Skudai, Johor Bahru, Johor, MALAYSIA.e-mail: [email protected]
TITLE ELABORATION/DEFINITION
Reinforced Concrete
pH > 12.5
Reality – cost
Mystery
Myth – last forever
INTRODUCTION
INTRODUCTION
Corrosion is commonly defined as the deterioration of a substance
(usually a metal) or its properties because of a reaction with its
environment.
Like other natural hazards corrosion can cause dangerous and
expensive damage to everything such as:
Automobiles
Home appliances
Drinking water
systems Pipelines
Bridges
Public buildings
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The dilapidation of concrete structures
is perhaps caused by corrosion of
embedded steel
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Impact on Economy
Country
Corrosion
cost ($
billion)
Corrosion
cost (GDP %)
Thailand 3.9 1.45%
Malaysia 6.7 3.23%
UK 70.6 3.09%
Australia 70.6 7.67%
China 310 3.34%
USA 451.3 2.7%
According to NACE (2016):
Types of Corrosion
STAGES IN CONSTRUCTION
DesignPrepare Plans &
Specifications
ProcureMaterials
PrepareShop
Details
Fabricate &Erect
Reinforcement
Build &Set
Formwork
MixConcrete
PlaceConcrete
StripFormwork Cure
CompletedStructure
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True improved performance of structures is hard
to achieve by improving the material characteristic
alone because of complex nature of environment.
Other factors that considered necessary are:
• the elements of architectural and structural design,
• process of execution, and inspection and
• maintenance procedure, including preventive maintenance.
Deflection
Wear
Spalling
Disintegration
Cracking
Scaling
Settlement
Delamination
Defect
Damage
Deterioration
Overloading
Chemical spill
Earthquake
Fire
Erosion
Corrosion of
metals
AAR
Sulphate Attack
Effect CAUSE
LeakageDesign
Materials
Construction
Design and Detailing – Flat roof
Workmanship - Water Ponding
