Metode de consolidare.pdf

Strengthening and Repair of Reinforced

ConcreteStructures

Strengthening and Repair of Reinforced

ConcreteStructures

Ian Wienholt

Business Development Manager

u 34 years of Concrete Repair and Strengthening Experience

u Over 12,000 Repair Projectu Over 25,000 PT Projectsu 1,500 Employeesu 22 Offices- International

UAE and UK

u 34 years of Concrete Repair and Strengthening Experience

u Over 12,000 Repair Projectu Over 25,000 PT Projectsu 1,500 Employeesu 22 Offices- International

UAE and UK

Structural Group delivers services, systems and technologies that build, repair, protect, strengthen and reinforce concrete, steel, masonry, wood, timber and soils.

Concrete Repair & WaterproofingConcrete Repair & Waterproofing

Masonry RestorationMasonry Restoration

Building Envelope Group:Historic Division

Building Envelope Group:Historic Division

Building Envelope Group:Multi-Family Division

Building Envelope Group:Multi-Family Division

Concrete Repair ServicesConcrete Repair Services

Honeycombs

Missing Reinforcement

ConstructionDefects

General Repair Group:Strengthening DivisionGeneral Repair Group:Strengthening Division

AgendaAgenda

u Strengthening Case StudiesCFRP & NSM RodExternal / Internal PT Section Enlargement / Supplemental Beams

u Strengthening Case StudiesCFRP & NSM RodExternal / Internal PT Section Enlargement / Supplemental Beams

CFRP & NSMCFRP & NSM

Externally Bonded FRP Sheet

550,000 psi Tensile

10x that of steel

Lightweight

Does NOT corrode

FRP Design GuidelinesFRP Design Guidelines440.2R-02 440.2R-08

To Date: Nationwide 15-18M sqft installedSPS 7M sqft installed on over 700 + projects

ACI 440.2R-08Em

ergin

g Tec

hnolo

gy

FRP Materials

SEM Image of FRP

FiberFiber

ResinResin

Tension Steel

Yield

FRP carries TENSION

What Is FRP Flexural Strengthened R/C?

Positive Moment

CompressionConcrete carries COMPRESSION

TOP

BOTTOM

Steel Tension

Yield

FRP carries TENSION

What Is FRP Flexural Strengthened R/C?

Column

Negative Moment

SHEAR

What Is FRP Shear Strengthened R/C?

CFRP Installation Step 1CFRP Installation Step 1

Surface Grinding / Shot Blasting to open pores


VE primer


VE putty


VE tack coat

Carter Ave Bridge UpgradeCarter Ave Bridge Upgrade

Tack coat QC


CFRP saturator


CFRP sheet lay up


Embedding of CFRP in tack coat


Rib rolling

Finished CFRP- Top, Sides, Bottom

CFRP Installation CompletedCFRP Installation Completed


Acrylic / Intumescent Topcoat installation

CFRP Finished ProductCFRP Finished Product

Supplemental Strengthening ONLY w/FRP!

42

FRP?

Supplemental Strengthening ONLY w/FRP!

CFRP Interfacial Shear FailureCFRP Interfacial Shear Failure

FRP Plates FRP Plates

FRP Rods

Flexural Strengthening Case Study

FRP Rod InstallationFlexural Strengthening Case Study

FRP Rod Installation

Parking Garage Ramp Parking Garage Ramp

Parking Garage Ramp FRP Sheet

NSM Rods Parking Garage Ramp

Damaged Double TDropped 2T in Parking Garage

Shear upgrade of 2T stem with FRP

Step plies

Flexural Detailing GuidelinesFlexural Detailing Guidelines

U Wrap

Quality ControlQuality Control

Field ApplicationField Application

Quality Control-Cure Test Cups DailyQuality Control-Cure Test Cups Daily

AB1Gal.

Pour off sample To verify cure

Tap test or other Tap test or other Pull testPull test

Sounding and Bond Tests

`

PingPuck

Sounding

6

Witness Panels for Testing

Pull off Bond Test Min. 200psi

Locate Bond Test Dollies outsidework area or on an additional piece of FRP

Locate Bond Test Dollies outsidework area or on an additional piece of FRP

Ear plug to protect threads

Frequency for Pull Testing

1 PULL PER INSTALLATION DAY MINIMUMOR

PER ENGINEERS SPEC (per sqft installed)

Repair Procedure1 - Identify Repair Area

Less than 2 Sq. In. / 5% Total Area Max. OK If 2 to 4 sq. in. inject with low pressure

Repair Procedure

Repair ProcedureStep 2 - Remove Composite Material

If greater than 4sq. In. grind or sawcut area

Repair ProcedureStep 3 - Prepare Lap Area

Minimum repair lap = 6 inches

6

New Loads or low strength concreteNew Loads or low strength concrete

CFRP Column ConfinementCFRP Column ConfinementIncreased:

Axial CapacityBuckling

Resistance

Bomb Blast

Resistance

General Concept

Structural UpgradeResorts Casino- Atlantic City


Structural Upgrade-Buckling ResistanceResorts Casino- Atlantic City

Blast Mitigation for ColumnsTruck bomb at curbside

Blast Mitigation for Columns Truck bomb at curbside

No FRP

Blast Mitigation for Columns Truck bomb at curbside

Guggenheim Museum NYCGuggenheim Museum NYC

1959

Goal: Extend the life of the structure by 100 years

Exhaustive investigative survey completed and found 11 coats of paint on the exterior

All exterior surfaces would be restored so that the original form lines would once again be visible


Original Construction Photo Circa 1957

Destructive testing to

open crack

SteelT-Section

RebarDiscontinuous

Original Construction Photos

Guggenheim Museum

Guggenheim Museum-Analysis & Monitoring

Circumferential Forces Vertical Forces

Initial repair concept

FRP

Steel brackets b/n web walls

Bond

Grout

DoubleBarrier Walls

Museum remained open!

Surface Preparation8,000 psi

1,674,345,869 Diamond Cup Wheels Used!

Extensive Crack Repair Required

Rout & Sealvs.Epoxy Injection

CFRP Installation

Web WallBrackets

Gunite wall to apron slab bracket FRP

Bracket

Apron bracket

Stainless

Steel

Grout

Shear transfer plate across cracks

Completed repair prior to insulation and drywall

South Locust Point Marine TerminalRoll-On / Roll-Off Platform


Pier expansion design included new pre-cast deck panels as well as a new 92 ramp for RO/RO cargoChange in use and heavier loads required strengthening upgrade to pier capsCFRP system designed for increased strength and long-term durability in marine environment



Challenge #1:Time Critical Schedule



Challenge #2:Weather conditions



Challenge #3:Access via work floats



Challenge #4:Coordination with other trades

Crane



Challenge #5:Employee safetyWater dangerWind / Waves Boat wakes

Rising tidesEnclosed space



Change of Scope:Concrete repair performed per ICRI guidelines



CFRP Termination Detail

CFRP Fabric U Wrap

NSM CFRP Rods

Concrete Pile Cap

1 2



Completed CFRP Strengthening



Completed Platform Ready for Cargo

Why do we love core

drills?

- They keep us in business

- They challenge us.

- They make us laugh..

Penetrations and the Core DrillShortest distance between 2 points is a straight line Penetrations and the Core Drill

Shortest distance between 2 points is a straight line

Process for New Slab PenetrationsVariables- Quantity of bars cut and size of Hole

New Penetrations New Penetrations

Column strip

New PenetrationsNew Penetrations

Internal & External Post Tensioning

Internal & External Post Tensioning

External Post Tensioning

F

FTENSION

NEW LOAD

Uplift at Deviator

Dead end

Live end

Flexural Strengthening Case StudyEnvironmental Overload

US Census Bureau HQ Suitland, MD.


4-630


Tension Tension

YIELD


Form & Pump

Amplitude


Dowel Hole Drilling

High Pressure Water Blasting

Dowel Insertion


43

Internal PTInternal PT DrillPT

Higher Loads on 2T- Load PathHigher Loads on 2T- Load Path

PolyethyleneSheathing

Intumescent FireRetardant Coating

Heat Resistant TendonHeat Resistant Tendon

Polyethylene Sheathing

Grease

270k P.T.Strand

Anchorage pin

DeviatorExternal PT

Higher Truck Loads- Ext. PT & OverlayHigher Truck Loads- Ext. PT & Overlay

Deviator


Center Z Anchor


Anchorage pin

DeviatorExternal PT


Section Enlargement & Supplemental

Beams

Section Enlargement & Supplemental

Beams

East Coast Ski ResortTransfer Slab Upgrade

Transfer Slab Cracking Transfer Slab Cracking

Foundation & Column Enlargements




18 Column Enlargements

Demo and PrepDemo and Prep

PAM Machine in Action

Supplemental Beam-Column Connection

Supplemental Beam-Column Connection

Mechanical Anchoring and Reinforcement Cage

Mechanical Anchoring and Reinforcement Cage

2000 Undercut Anchors

3000 HiltiStuds

Through-Bars at Column HeadThrough-Bars at Column Head

SCC Pumping Anyone???SCC Pumping Anyone???

40 Tons of Steel

1100 LF

Enlargement Prep & Placement

NewExisting

Finished ProductFinished Product

185 CU YDS / 375 Tons of

Concrete

Finished ProductFinished Product

Repair, Upgrade and Strengthening ProcessRepair, Upgrade and Strengthening Process

Existing Capacity New Demand

Engineering

Material

Science

Test/Verification

Constructability

Aesthetics

Economics

Existing Capacity New Demand

EngineeringMaterial ScienceTest/Verification Constructability

Aesthetics

Economics

Repair and Strengthening Process

ReverseEngineer

Concluding RemarksTHANK YOU!Concluding RemarksTHANK YOU!

u Contracting Servicesu Preliminary Design and

Estimate Supportu D/B Capabilitiesu Optimizing Repairsu Load Testingu Comprehensus

u Contracting Servicesu Preliminary Design and

Estimate Supportu D/B Capabilitiesu Optimizing Repairsu Load Testingu Comprehensus

Documents

Metode de consolidare.pdf