DSI Company Presentation

Post-Tensioning – StrengtheningBridges

PTI Convention Reno – May 06

Vacuum Grouting

2006 PTI TECHNICAL CONFERENCE –SESSION 1 - BRIDGES VACUUM GROUTING MARC TESSIER

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Grouting Pathologies - Visible Results

• Structural cracking

• Tendon break

• Slippage & failure at anchor (where visible)

• Tendon corrosion – Leaks (where visible)

2006 PTI TECHNICAL CONFERENCE –SESSION 1 - BRIDGES VACUUM GROUTING MARC TESSIER

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Grouting Pathologies Sources

• Poor materials

• Insufficient procedures

• Poor materials– High bleed– Non thixotropic– Variable mixing ratios

• Poor craftsmanship– Little or no grout in cable– Slow or discontinued flushing– Insufficient attention to procedure (venting)– Lack of training?

• Insufficient procedures– Lack of on-site testing & documentation– Improper venting– Insufficient equipment specification– Cold/Hot weather grouting

• Poor craftsmanship

2006 PTI TECHNICAL CONFERENCE –SESSION 1 - BRIDGES VACUUM GROUTING MARC TESSIER

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Inspection

• Non-Destructive Testing:

* Ground Penetrating Radar* Impact Echo

2006 PTI TECHNICAL CONFERENCE –SESSION 1 - BRIDGES VACUUM GROUTING MARC TESSIER

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GPR to Locate Ducts

• 1.5 Gigahertz Antenna

• Ducts are located precisely

• Permits videoscope visual inspection

• Vacuum Grouting

2006 PTI TECHNICAL CONFERENCE –SESSION 1 - BRIDGES VACUUM GROUTING MARC TESSIER

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Ground Penetrating Radar

2006 PTI TECHNICAL CONFERENCE –SESSION 1 - BRIDGES VACUUM GROUTING MARC TESSIER

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GPR Scan Across Bridge Shoulder Cantilever Ducts Visible

Rebar

Bottom of Concrete PT Ducts

2006 PTI TECHNICAL CONFERENCE –SESSION 1 - BRIDGES VACUUM GROUTING MARC TESSIER

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Inspection

• Non-Destructive Testing:

* Ground Penetrating Radar* Impact Echo

2006 PTI TECHNICAL CONFERENCE –SESSION 1 - BRIDGES VACUUM GROUTING MARC TESSIER

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Impact Echo Principle

Flaw

Olson Instruments, Inc. Impact Echo IE-1test head incorporating source and receiver

*Reflection from backside occurs at a lower frequency than thatfrom the shallower concrete/flaw interface

Reflection from concrete/flawinterface

Reflection from backside oftest member

*

2006 PTI TECHNICAL CONFERENCE –SESSION 1 - BRIDGES VACUUM GROUTING MARC TESSIER

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Impact Echo Scanning

2006 PTI TECHNICAL CONFERENCE –SESSION 1 - BRIDGES VACUUM GROUTING MARC TESSIER

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Impact Echo PrintoutVertical Scan on Empty Steel and Plastic ducts

2006 PTI TECHNICAL CONFERENCE –SESSION 1 - BRIDGES VACUUM GROUTING MARC TESSIER

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Verification of NDT Results

• Limited Invasive Inspection:

* Special Drilling* Air Communication Testing* Videoscope Inspection* Void Volume Measurements

2006 PTI TECHNICAL CONFERENCE –SESSION 1 - BRIDGES VACUUM GROUTING MARC TESSIER

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Drilling Equipment with Metal Sensor

2006 PTI TECHNICAL CONFERENCE –SESSION 1 - BRIDGES VACUUM GROUTING MARC TESSIER

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Inspecting Voids at Anchorage Area

2006 PTI TECHNICAL CONFERENCE –SESSION 1 - BRIDGES VACUUM GROUTING MARC TESSIER

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Inspecting Voids along Tendon Length

2006 PTI TECHNICAL CONFERENCE –SESSION 1 - BRIDGES VACUUM GROUTING MARC TESSIER

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Strands Exposed Inside Tendon Void

2006 PTI TECHNICAL CONFERENCE –SESSION 1 - BRIDGES VACUUM GROUTING MARC TESSIER

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Water Inside a Void

2006 PTI TECHNICAL CONFERENCE –SESSION 1 - BRIDGES VACUUM GROUTING MARC TESSIER

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Corroded Strands Inside a PT Cable

2006 PTI TECHNICAL CONFERENCE –SESSION 1 - BRIDGES VACUUM GROUTING MARC TESSIER

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Corroded Strands Inside a Stay Cable

2006 PTI TECHNICAL CONFERENCE –SESSION 1 - BRIDGES VACUUM GROUTING MARC TESSIER

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Void Volume Measurement

2006 PTI TECHNICAL CONFERENCE –SESSION 1 - BRIDGES VACUUM GROUTING MARC TESSIER

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Voids Measurement

Digital Volumeter

2006 PTI TECHNICAL CONFERENCE –SESSION 1 - BRIDGES VACUUM GROUTING MARC TESSIER

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Void Volume Measurementwith leak rate measurement

2006 PTI TECHNICAL CONFERENCE –SESSION 1 - BRIDGES VACUUM GROUTING MARC TESSIER

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Verification of NDT Results

• Limited Destructive Testing:

* Manual Duct Opening* Visual Inspection

2006 PTI TECHNICAL CONFERENCE –SESSION 1 - BRIDGES VACUUM GROUTING MARC TESSIER

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Tendon Condition Assessment

2006 PTI TECHNICAL CONFERENCE –SESSION 1 - BRIDGES VACUUM GROUTING MARC TESSIER

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44 43 42 41 40 39 38 37 36 35 34 33 32 31Tendon

T1E R

air in air outStep: 2

air out air in

inject 8.3 liter

Step: 3

Step: 4

Step: 5

Step: 6

Step: 7

Total Volume injected: 79.8 liter

inject 5.8 liter

inject 20 liter

inject 31.7 liter

inject 14 literStep: 8

Total Volume measured: 63.2 liter

44

36

35

32

43

Air Passage through Bottle Neck

Injection of multiple connected Voids

2006 PTI TECHNICAL CONFERENCE –SESSION 1 - BRIDGES VACUUM GROUTING MARC TESSIER

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Re-Grouting Procedures

Gravity Feed

Compressor

Pressure Grouting Vacuum Grouting

VacuumPump

Assisted Vacuum Grouting

2006 PTI TECHNICAL CONFERENCE –SESSION 1 - BRIDGES VACUUM GROUTING MARC TESSIER

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Vacuum Grouting Equipment

2006 PTI TECHNICAL CONFERENCE –SESSION 1 - BRIDGES VACUUM GROUTING MARC TESSIER

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Hand Held Colloidal Mixer

2006 PTI TECHNICAL CONFERENCE –SESSION 1 - BRIDGES VACUUM GROUTING MARC TESSIER

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Vacuum Grouting Mock - Up

2006 PTI TECHNICAL CONFERENCE –SESSION 1 - BRIDGES VACUUM GROUTING MARC TESSIER

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Tremie Tube Mock-Up – Int. Section

2006 PTI TECHNICAL CONFERENCE –SESSION 1 - BRIDGES VACUUM GROUTING MARC TESSIER

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Section at Anchorage Location

2006 PTI TECHNICAL CONFERENCE –SESSION 1 - BRIDGES VACUUM GROUTING MARC TESSIER

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Intermediate Section

2006 PTI TECHNICAL CONFERENCE –SESSION 1 - BRIDGES VACUUM GROUTING MARC TESSIER

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V measured vs. V injected - Sources of Discrepancy

• Bottle necks

2006 PTI TECHNICAL CONFERENCE –SESSION 1 - BRIDGES VACUUM GROUTING MARC TESSIER

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• Multiple leaks along tendon

V measured vs. V injected - Sources of Discrepancy

2006 PTI TECHNICAL CONFERENCE –SESSION 1 - BRIDGES VACUUM GROUTING MARC TESSIER

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• Cracks, honeycombs, voids around duct

V measured vs. V injected - Sources of Discrepancy

2006 PTI TECHNICAL CONFERENCE –SESSION 1 - BRIDGES VACUUM GROUTING MARC TESSIER

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• Duct communication

V measured vs. V injected - Sources of Discrepancy

2006 PTI TECHNICAL CONFERENCE –SESSION 1 - BRIDGES VACUUM GROUTING MARC TESSIER

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Repair & Strengthening

• Vacuum Grouting

• DSI Half Pipe for External Tendons

• DynaWrap for External Tendons

• External Post-Tensioning: * Bar tendons* Monostrand tendons* Multistrand tendons

2006 PTI TECHNICAL CONFERENCE –SESSION 1 - BRIDGES VACUUM GROUTING MARC TESSIER

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2006 PTI TECHNICAL CONFERENCE –SESSION 1 - BRIDGES VACUUM GROUTING MARC TESSIER

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2006 PTI TECHNICAL CONFERENCE –SESSION 1 - BRIDGES VACUUM GROUTING MARC TESSIER

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DSI Company Presentation

DSI Post-Tensioning / Reinforcing – Repair and Strengthening1735 N. Troy St. #415Arlington, VA 22201

(703) 465-4470 (866) 308-3832 - fax

Thank you for your attention

2006 PTI TECHNICAL CONFERENCE –SESSION 1 - BRIDGES VACUUM GROUTING MARC TESSIER

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