int approach to concrete repair - x-calibur
TRANSCRIPT
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An Integrated Approach to Concrete An Integrated Approach to Concrete
RepairRepair
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Concrete Corrosion Basic Concrete Corrosion Basic
MechanismMechanism
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Causes: CarbonationCauses: Carbonation
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Causes: Lack of CoverCauses: Lack of Cover
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Causes: Lack of CoverCauses: Lack of Cover
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Causes: Chloride AttackCauses: Chloride Attack
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Causes: Freeze Thaw AttackCauses: Freeze Thaw Attack
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Causes: Chemical AttackCauses: Chemical Attack
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Causes: Construction & DesignCauses: Construction & Design
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Concrete in the Marine EnvironmentConcrete in the Marine Environment
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�Visual survey
�Delamination (hammer) survey
�Rebound hammer survey
�Potential mapping
�Chloride profile testing
�Reinforcement cover assessment
�Carbonation testing
Investigative TechniquesInvestigative Techniques
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�Pre-qualify contractors
�Must have manpower and equipment
�Visit previous works
� Tender to based on recent comprehensive investigation
�Unit rate contract
�Client to have high quality supervision
Contractor SelectionContractor Selection
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Repair StagesRepair Stages
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�Conventional concrete
�High performance concrete
�Sprayed concrete
�Polymer modified mortars (hand or spray)
� Fluid micro-concrete
�Rapid cure mortar
�Resin mortars
�Composites
Repair OptionsRepair Options
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Surface CleaningSurface Cleaning
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Surface PreparationSurface Preparation
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Steel PreparationSteel Preparation
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�Zinc rich coating
� Epoxy coating
�Cement epoxy coating
�Polymer modifed cement slurry
�Zinc anodes
�Surface applied corrosion inhibitor
�Cast in corrosion inhibitor
�Drilled in corrosion inhibitor
Steel Protection OptionsSteel Protection Options
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Reinforcement ProtectionReinforcement Protection
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�Water
�Non redispersable polymer
� Epoxy
�Polymer modifed cement slurry
Priming OptionsPriming Options
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Hand Applied Hand Applied
Cementitious MortarCementitious Mortar
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Sprayed ConcreteSprayed Concrete
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Form and PourForm and Pour
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�Water
�Water & hessian
�Water & hessian sealed with PE sheet
�Curing compound
�Protective coating
Curing OptionsCuring Options
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�Silane
�Silane siloxane
�Polymer modified cementitious coating
�Aliphatic acrylic coatings
� Epoxy or PU coatings
Protection OptionsProtection Options
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Protection of the RepairProtection of the Repair
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� A through investigation is necessary
� Repair as soon as possible after the
investigation
� Select the most appropriate repair technique and materials
� Select a professional contractor with a track record
� Confirm contractor’s track record� Preparation is the key to a good repair� Supervise the works using an experienced consultant
� Install a protection system
SummarySummary