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By DennisBy Dennis ChoiChoi

Concrete Repair MethodConcrete Repair MethodConcrete Repair Method

NoteNote::

The information used in thisThe information used in thispowerpointpowerpoint is extracted from HKCRA and ICRIis extracted from HKCRA and ICRI

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Concrete Repair ProcedureConcrete Repair ProcedureConcrete Repair Procedure

Part 1Part 1 -- Concrete EvaluationConcrete Evaluation

Part 2Part 2 -- Concrete Repair MethodConcrete Repair Method

Part 3Part 3 -- Quality ControlQuality Control

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Part 1 -Part 1Part 1 Concrete Evaluation-- Concrete EvaluationConcrete EvaluationDepends on complexity and size of the jobDepends on complexity and size of the job

Before Repair WorksBefore Repair Works

zz (Open Up) Visual or(Open Up) Visual RITS (Rapid Infraredor RITS (Rapid Infrared ThermographicThermographic Survey)Survey)

andand delaminationdelamination Survey (Hammer Tapping)Survey (Hammer Tapping)

zzCovermeterCovermeterSurveySurvey -- in according with BS4408 Part 1in according with BS4408 Part 1

zzCarbonation Depth MeasurementCarbonation Depth Measurement

PH of concrete 12.5PH of concrete 12.513.5 drop to 11 or below.13.5 drop to 11 or below.

Carbonation coefficient by application ofCarbonation coefficient by application ofFickFickss LawLaw

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Part 1 - Concrete EvaluationPart 1Part 1 -- Concrete EvaluationConcrete Evaluation

Before Repair WorksBefore Repair Works

zzElectrochemical Potential (Half Cell)Electrochemical Potential (Half Cell)

--Measurement in accordance with ASTM C876Measurement in accordance with ASTM C876--8080

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Part 1 - Concrete EvaluationPart 1Part 1 -- Concrete EvaluationConcrete Evaluation

Before Repair WorksBefore Repair Works

zzConcreteConcrete ResistivityResistivity MeasurementMeasurement

zz

Chloride Content DeterminationChloride Content Determination

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Part 1 -Part 1Part 1 Concrete Evaluation-- Concrete EvaluationConcrete EvaluationAfterAfter Repair Works (Q/C)Repair Works (Q/C)

z RITS

z Covermeter Survey

z Rebound Hammer

z Bond Test ( Direct pull-off)

z Others Similar to the Before Repair Works

(for comparison the result)

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- Concrete Repair MethodPart 2Part 2Part 2 -- Concrete Repair MethodConcrete Repair Method

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Surface Repair MethodSurface Repair Method

Patching Method /Grouting Method Spray Method

Patching MethodPatching Method //Grouting MethodGrouting Method Spray MethodSpray Method FullFull--Depth Replacement MethodDepth Replacement Method

Concrete Recasting Method

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Concrete Repair MethodConcrete Repair Method

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Concrete Repair MethodConcrete Repair Method

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Concrete Repair MethodConcrete Repair Method

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Concrete Repair MethodConcrete Repair Method

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Concrete Repair MethodConcrete Repair Method

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Concrete Repair MethodConcrete Repair Method

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Concrete Repair MethodConcrete Repair Method

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Concrete Repair MethodConcrete Repair Method

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Part 2Part 2 -- Concrete Repair MethodConcrete Repair Method

Extracted from the ICRI Concrete Repair Manual,

emphasis the following items

zz General description ( limitaGeneral description ( limitatition of different methods)on of different methods)

zz Best application conditionBest application condition

zz MateriMaterial selection requirement (al selection requirement ( available of different materialavailable of different material inin local market)local market)

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Part 2Part 2 -- Concrete Repair MethodConcrete Repair Method

Other Consideration

zz Time ConstraiTime Constraintnt

zz

Serviceability requirement (upgrade/resume)Serviceability requirement (upgrade/resume)

zz Cost saving (value added)Cost saving (value added)

zz Efficiency of worksEfficiency of works

zz End resultEnd result -- durabilidurabilittyy, appearance, clients, appearance, clients satisfactionsatisfactionetc)etc)

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Case StudyCase StudyCase Study

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Concrete RepairConcrete Repair

--

PatchingPatching

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Concrete RepairConcrete Repair

--

PatchingPatching

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Form & Dry Packing MethodForm & Dry Packing Method

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Concrete RepairConcrete Repair --SpraySpray

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Concrete RepairConcrete Repair --SpraySpray

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Concrete RepairConcrete Repair --GroutingGrouting

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Concrete RepairConcrete Repair --GroutingGrouting