Final Hamilton StGeorge

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Topic Description

In 2004 the Bryant Patton Bridge over Apalachicola Bay in the Florida panhandle was replaced. During demolition, twelve

prestressed concrete piles with varying levels of corrosion damage were recovered. Two of the selected piles were equipped with a

cathodic protection that had been installed in 1994 as part of a repair project involving most of the piles supporting the bridge.

REsults of flexural and material testing that were conducted on the recovered piles will be presented.

Speaker Biography

H. R. (Trey) Hamilton III, P.E., PhD is an Associate Professor of Civil Engineering at the University of Florida in the Department

of Civil & Coastal Engineering. His research and teaching interests include reinforced and prestressed concrete.

University of Florida


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Use of FRP Composites to Repair and

Strengthen Concrete Bridges

October 5, 20

St George Island Bridge Pile TestingSt George Island Bridge Pile Testing

Trey Hamilton, P.E., Ph.D.Trey Hamilton, P.E., Ph.D.University of FloridaUniversity of Florida

AcknowledgementsAcknowledgements

FDOT Research CenterFDOT Research Center

Mr. Marc Ansley, Project ManagerMr. Marc Ansley, Project Manager

Eric Cannon, ClaireEric Cannon, Claire LewingerLewinger andand LazLaz Alfonso,Alfonso,

CaesarCaesar AbiAbi, UF Graduate Students, UF Graduate Students

Frank Cobb, Tony Johnston, David Allen, PaulFrank Cobb, Tony Johnston, David Allen, Paul

TigheTighe, and Steve, and Steve EudyEudy of the FDOT Structuresof the FDOT StructuresResearch CenterResearch Center

Mr. ScottMr. Scott GrosGros ofofBohBoh Bros. ConstructionBros. Construction


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October 5, 20

AcknowledgementsAcknowledgements

Mr. RichardMr. Richard DelorenzoDelorenzo, FDOT State Materials, FDOT State Materials

Office (strand testing)Office (strand testing)

Mr. DonMr. Don BuwaldaBuwalda and the inspection team fromand the inspection team from

FDOT District TwoFDOT District Two

Mr. IvanMr. Ivan LasaLasa from the Corrosion Group of thefrom the Corrosion Group of the

FDOT State Materials OfficeFDOT State Materials Office

Mr. WilliamMr. William ScannellScannell ofofConcorrConcorr, Florida, Inc., Florida, Inc.

OutlineOutline

IntroductionIntroduction

Pile RecoveryPile Recovery

TestingTesting

ResultsResults

ConclusionsConclusions


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October 5, 20

LocationLocation

Apalachicola Bay

Bryant Grady

Patton Bridge

St. George

Island

HistoryHistory Bryant Grady PattonBryant Grady Patton

BridgeBridge

Constructed in 1965.Constructed in 1965.

Carries SR 300 over Apalachicola BayCarries SR 300 over Apalachicola Bay

Pile repair in 1994Pile repair in 1994

PatchPatch

Concrete jacketingConcrete jacketing

Cathodic protectionCathodic protection Removed from service 2004Removed from service 2004


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October 5, 20

1994 Repair Program1994 Repair Program

Cathodic Protection SystemCathodic Protection System

Sprayed Zinc

Zinc Mesh

Bulk Anode

Splash

Zone


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October 5, 20

ObjectivesObjectives

Evaluate remaining flexural capacity of pilesEvaluate remaining flexural capacity of piles

Why? Resistance to lateral loads such as bargeWhy? Resistance to lateral loads such as barge

impact.impact.

Compare tested capacity to visual ratingCompare tested capacity to visual rating

Why? Most inspections are visual with ratings usedWhy? Most inspections are visual with ratings used

to classify state of bridge.to classify state of bridge.

TasksTasks

Select pilesSelect piles

Visual inspection and corrosion potentials inVisual inspection and corrosion potentials inplaceplace

Sample dissolved hydrogen in CP pileSample dissolved hydrogen in CP pile

Sample chloride content of concreteSample chloride content of concrete

Structural testingStructural testing

PostPost--test evaluationtest evaluation

Materials testingMaterials testing


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October 5, 20

RecoveryRecovery SelectionSelection

FDOT D2 InspectionFDOT D2 Inspection


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October 5, 20

RecoveryRecovery Cap Beam RemovalCap Beam Removal

RecoveryRecovery Pile RemovalPile Removal

12 piles recovered and tested12 piles recovered and tested


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October 5, 20

RecoveryRecovery Pile RemovalPile Removal

On site sampling of prestressingOn site sampling of prestressingstrands for dissolved hydrogenstrands for dissolved hydrogen

RecoveryRecovery Pile PreparationPile Preparation


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October 5, 20

Specimen DetailsSpecimen Details

(20) 7/ 16(20) 7/ 16--in. diameter stress relieved 7in. diameter stress relieved 7--wirewire

prestressing strandsprestressing strands

Average tested tensile strength of strands = 261Average tested tensile strength of strands = 261

ksiksi

Core concrete strength = 6200 psiCore concrete strength = 6200 psi

Flexural Test SetFlexural Test Set--upup

SCALE: NTS

HIGH/LOW WATERMARK

LOAD CELL

42" TRANSFER BEAMCENTERED BETWEENWATER MARKS

PLATE 9" x 18" x 2" (TYP.)

9" x 18" x 1 1/2" NEOPRENE

BEARING PAD (TYP.)

CLEVIS LOAD CELLS

36"

SUPPORT SUPPORT

HIGH/LOW WATERMARK

9" x 18" x 2" NEOPRENEBEARING PAD (TYP.)

PLACE SUPPORT INBOARD FROM DAMAGE (TYP.)

SPLASH ZONE MOST HEAVILY DAMAGED

FACE PLACED DOWN

a b


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October 5, 20

Flexural Test SetFlexural Test Set--upup

Typical Flexural BehaviorTypical Flexural Behavior


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October 5, 20

Typical Flexural BehaviorTypical Flexural Behavior

0

5

10

15

20

25

30

35

40

0.0 0.5 1.0 1.5 2.0 2.5

Displacements (in)

Loa

d(kips

)

Corrosion DamageCorrosion Damage


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October 5, 20

Flexural Test ResultsFlexural Test Results

0

0.2

0.4

0.6

0.8

1

1.2

40-3J

32-3J

44-3CP

39-2

40-2

31-1

44-1CP

44-4

44-2

29-2

33-4J

40-4

Pile

Norma

lize

dMomen

tCapac

ity

Corrosion PotentialsCorrosion Potentials

0

1

2

3

4

5

6

7

8

-700 -600 -500 -400 -300 -200 -100 0

Corrosion Potentials (mVCSE)

Elevation(ft)

AboveMHW

40-3

32-3

40-4

39-2

44-2

29-2

350mVCSE


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October 5, 20

Corrosion PotentialsCorrosion Potentials

0

1

2

3

4

5

6

0 20 40 60 80 100 120

Remaining Flexural Capacity (%)

Distancea

bove

MHW

where

Corros

ion

Po

ten

tia

l

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Final Hamilton StGeorge