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RAYMOND J. POLETTO, PEMUESER RUTLEDGE CONSULTING ENGINEERSWWW.MR C E . C OM

DFI 2012 SHORT COURSE & SPECIALTY SEMINAR:

DESIGN & CONSTRUCTABILITY OFDIAPHRAGMWALLS:QUALITY ASSURANCE &QUALITY CONTROL

QUALITY ASSURANCE &QUALITY CONTROL: GOALS

1. Limit Defects In PanelConstruction

2. Good CooperationNeeded By Owner’sRepresentative, DesignEngineer, Specialty AndGeneral Contractors

3. Implement Design OrWork Changes If FieldConditions Or ConstructionMethods Show Problems

4. Avoid Litigation ByProper Communication

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QUALITY ASSURANCE & QUALITYCONTROL: WORK PROCESS

1. Set Out ConstructionProcedures Which AreReasonable Expectations OfAchieving The Slurry WallFunction. (Lateral Or VerticalStructural Element And To LimitThe Flow Of Groundwater)

2. Contractor Provides TheQuality Control Of The SlurryWall Construction Per ContractRequirements Or IndustryStandards

3. Inspections Provide TheQuality Assurance Of TheConstructed Wall And Provide ARecord Of ConstructionProcedures

4. Field Conditions and WorkProcedures Should Be CarefullyReviewed By ExperiencedGeotechnical & StructuralPersonnel Relating Causes AndEffects As Closely As Possible

1. Panel Types andConstruction Methods(Temporary or Permanent Walls)

2. Expect LimitedSeepage of WatertightSystems & PossibleNeed for InteriorDrainage

3. ExpectIrregularities in WallFace

4. Inspection byContractor and byOwner’s Team

5. AddressConstruction Defects& Repairs

6. Review Good or PoorPractices by ConstructionTeam

UNDERSTANDING PROJECTEXPECTATIONS & REQUIREMENTS

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Panel Types

IndividualLoad BearingElements

SegmentedConcretePanels

ReinforcedConcretePanels

Soldier Beam& ConcreteWalls (SPTC)

Precast WallsPost

TensionedWalls

PANEL CONSTRUCTIONMETHODS

1. Round PipeJoints

2. Steel BeamJoint (Soldier PileTremie Concrete)

3. Key Joint 4. Key Joint withWaterstop

FORMEDWALL JOINTS

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PANEL JOINTS

SEMICIRCULARPANEL JOINTFORMED BYEND STOP PIPE

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SPECIAL ENDSTOP DEVICEWITH PVCWATERSTOPFOR KEY INPANEL JOINT

REINFORCED CONCRETE PANELSEQUENCE

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PANELMETHODWITH HYDROMILL

OVERCUT INPRIMARYPANEL BYHYDROMILL

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EXPECTWALL SEEPAGE &MOISTURE CONTROL

Watertight WallSystems AllowMinor WallSeepage

Some Wall PanelsMay Have Seepage

Tieback Sleeves &Anchor Heads MayLeak

Seepage &Moisture ControlMethods AreNeeded

IDEALWATER TIGHTNESS OF JOINTS &FACE OF PANELS

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TYPICALWALL SEEPAGEBEFORE FINAL SEALING

WALL LEAKS BEFORE GROUTING

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SEALING OFTIEBACKSLEEVES &HEADS

TREATEDWALLWITH INTERIORDRAINAGECOLLECTIONSYSTEM

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Remove Bentoniteor Cement Fill in

Panel Joint

Fill Wall Voids inPanel Concrete &Cut Floor Slab Keys

Remove Overpoursof Panel Concrete

Trim Concrete atTop of Wall

IRREGULARITIES INWALL FACE

REMOVEBENTONITEFILL IN PANELJOINT

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FILL WALL VOIDS IN PANELSCUT FLOOR SLAB KEYS

REMOVECONCRETEOVERPOURS INPANELS

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TRIMCONCRETE ATTOP OFWALL

Proper Inspection by a qualified geotechnical engineer and/orinspector familiar and experienced with installation and testingslurry fluids, concrete and structural steel is essential to thesuccessive completion of this work because to a large extent

problems occur with inaction or inability to understand constructionprocedures, site geological conditions and test results. The

evaluations of these elements are critical in achieving quality work.

Proper Inspection by a qualified geotechnical engineer and/orinspector familiar and experienced with installation and testingslurry fluids, concrete and structural steel is essential to thesuccessive completion of this work because to a large extent

problems occur with inaction or inability to understand constructionprocedures, site geological conditions and test results. The

evaluations of these elements are critical in achieving quality work.

The inspector needs to review the contractor’s work includingsampling of all materials and carefully monitoring and collecting the

required test information for proper quality assurance. Manyprojects have experienced severe problems; cost over runs and

delays because the project owners and construction managementteam relied on untrained, inexperienced and non motivated

inspectors.

The inspector needs to review the contractor’s work includingsampling of all materials and carefully monitoring and collecting the

required test information for proper quality assurance. Manyprojects have experienced severe problems; cost over runs and

delays because the project owners and construction managementteam relied on untrained, inexperienced and non motivated

inspectors.

INSPECTORS ROLE IN CHECKINGWORKQUALITY &MATERIALS

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• Verification Drilling In Key Stratum (Sometimes Need InRock Or Dense Alluvial and Glacial Deposits)

• Verticality Checks• Bentonite Testing• Concrete Testing• End Bearing: Check for Loose Soil or Rock• Site Monitoring & Instrumentation• Upon Wall Exposure: Visual Checks Of Wall Seepage,Concrete Fascia, Panel Joints And Keys, Sealing Leaks andWall Repairs

• “Industry Practice Standards and DFI Practice GuidelinesFor Structural Wall”

QUALITY ASSURANCE CHECKS

WALLTOLERANCES

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CONTROL PANEL EXCAVATION BYCHECKING BUCKET DEVIATIONWITHINGUIDEWALLS

TRENCHSUPPORT BYBENTONITESLURRY INVARIOUSSOILS

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SLURRY FLUIDINSPECTIONREPORT FORM

MAKE SLURRY FLUID CHECKS BEFOREPLACEMENT OF CONCRETE

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PANEL CAGE FABRICATION

INSTALLATIONOF TYPICALREINFORCINGCAGE

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SLURRYWALLPANEL REPORTFORM

CHECKS DURING THEPLACEMENT OF CONCRETE

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POURING TREMIE CONCRETEINTO PANEL

TREMIE CONCRETE REPORT FORM

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TROUBLE SHOOTING &PROBLEM SOLVING:FIELD RECORDS CAN REVEALPOTENTIAL CORRECTIVE WORKOR DEFECTS

TREMIECONCRETEPOUR CHART

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MONITORWALL CONDITIONS DURINGEXCAVATION STAGES

MONITOR THEWALL MOVEMENTS &CRACKS IN PAVEMENTSWHILEWAITING FOR LEAK REPAIRS

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OBSERVE CONSTRUCTION DEFECTS,REPAIRS & CORRECTIVEWORK

CONSEQUENCES OF POORQUALITY CONTROL ORINSPECTION

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STOPPINGWALL OR TIEBACKANCHOR LEAKS IS VERY IMPORTANT

WALL LEAKS UNATTENDEDWILL IN TIME BE A PROBLEM

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GoodConstructionInspection &Quality ControlMeasures Assure

BetterConstruction

TimelyCommunicationBetween Parties

Attend to PanelDefects in Timely

Manner

SUMMARY OF GOODQA/QC PRACTICES

RAYMOND J. POLETTO, PEMUESER RUTLEDGE CONSULTING ENGINEERSWWW.MR C E . C OM

THANK YOU ! QUESTIONS WILL NOW BE TAKEN.