extending the life of bridge assets: case studies of
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APRIL 2019, GRANT DOWLINGSIKA AUSTRALIA
EXTENDING THE LIFE OF BRIDGE ASSETS: CASE STUDIES OF BRIDGE REPAIRS USING CONCRETE REPAIR SOLUTIONS AND CFRP STRENGTHENING
1. CONCRETE DURABILITY – REPAIR OF NEW CONSTRUCTION/EXISTING ASSETS
2. IMPROVING THE LONGEVITY THROUGH STRUCTURAL STRENGTHENING
3. HISTORY OF CFRP INTERNATIONAL
4. CASE STUDY OF TESTING –INTERNATIONAL
5. CASE STUDIES IN AUSTRALIA
CONTENTS
New construction issues ▪ Shrinkage cracking▪ Low Cover▪ Poor Compaction▪ Cosmetic defects▪ Low Strength Concrete▪ Design Errors▪ Post Tensioning issues▪ Durable repairs to meet the
design life.
NEW CONSTRUCTION REPAIRS & DURABILITY
Aging Assets have added issues to deal with:▪ Chlorides▪ Carbonation▪ Fatigue ▪ Under capacity, new codes▪ Cracking from overloading▪ Impact damage▪ Durable repair solutions▪ Impressed current solutions▪ Structural Upgrades
CONCRETE DURABILITY OF EXISTING STRUCTURES
▪ Once durability of the concrete has been sorted
▪ What about the structural capacity?
▪ What are the options and down sides?
Tear it down and rebuild?▪ Inconvenience ▪ Cost and Time for the
demolition, rebuild dumping costs
UPGRADING OF OLD STRUCTURES
▪ Once durability of the concrete has been sorted
▪ What about the structural capacity?
▪ What are the options and down sides?
Tear it down and rebuild?▪ Inconvenience ▪ Cost and Time for the
demolition, rebuild dumping costs
UPGRADING OF OLD STRUCTURES
▪ Once durability of the concrete has been sorted
▪ What about the structural capacity?
▪ What are the options and down sides?
Tear it down and rebuild?▪ Inconvenience ▪ Cost and Time for the
demolition, rebuild dumping costs
UPGRADING OF OLD STRUCTURES
STRUCTURAL CAPACITY OF THE ASSETASSESSMENT - CAUSES
STRUCTURAL IMPROVEMENT
▪ Traffic load▪ Machine load▪ Vibration reduction▪ Deflection ▪ Impact resistance▪ Seismic resistance▪ Change of standards
/ regulations
STRUCTURAL RECOVERY▪ Corrosion▪ Mechanical
damage▪ Fire▪ Impact▪ Explosion
ERRORS IN DESIGN/ CONSTRUCTION▪ Concrete quality▪ Steel quantities
or distribution▪ Wrong
dimensions▪ Design /
Calculation
April 25 201310 Guideline design of CFRP by FIB and ACI/ EIT Bangkok
HISTORY OF CFRP INTERNATIONALLY
CREEP testing of Epoxy and Steel plate bonding 1970’s still going today
TIMBER BRIDGES
THE FAMOUS WOODEN BRIDGE OVER THE RIVER REUSS IN SINS in Switzerland is more than 200 years old and was built in 1807 with an original design capacity of 11 tonne. CFRP installed to achieve a 18 tonne capacity.
▪ Large amount of supplier input.
▪ Epoxy performance at low temps
▪ Fatigue testing information
▪ Curing information curing in low temperatures.
MONASH FREEWAY BRIDGE STRENGTHENING
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