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DSI Company Presentation
Post-Tensioning – StrengtheningBridges
PTI Convention Reno – May 06
Vacuum Grouting
2006 PTI TECHNICAL CONFERENCE –SESSION 1 - BRIDGES VACUUM GROUTING MARC TESSIER
(C) COPYRIGHT POST-TENSIONING INSTITUTE, ALL RIGHT RESERVED Page 1 of 40
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
(C) COPYRIGHT POST-TENSIONING INSTITUTE, ALL RIGHT RESERVED Page 2 of 40
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
(C) COPYRIGHT POST-TENSIONING INSTITUTE, ALL RIGHT RESERVED Page 3 of 40
Inspection
• Non-Destructive Testing:
* Ground Penetrating Radar* Impact Echo
2006 PTI TECHNICAL CONFERENCE –SESSION 1 - BRIDGES VACUUM GROUTING MARC TESSIER
(C) COPYRIGHT POST-TENSIONING INSTITUTE, ALL RIGHT RESERVED Page 4 of 40
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
(C) COPYRIGHT POST-TENSIONING INSTITUTE, ALL RIGHT RESERVED Page 5 of 40
Ground Penetrating Radar
2006 PTI TECHNICAL CONFERENCE –SESSION 1 - BRIDGES VACUUM GROUTING MARC TESSIER
(C) COPYRIGHT POST-TENSIONING INSTITUTE, ALL RIGHT RESERVED Page 6 of 40
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
(C) COPYRIGHT POST-TENSIONING INSTITUTE, ALL RIGHT RESERVED Page 7 of 40
Inspection
• Non-Destructive Testing:
* Ground Penetrating Radar* Impact Echo
2006 PTI TECHNICAL CONFERENCE –SESSION 1 - BRIDGES VACUUM GROUTING MARC TESSIER
(C) COPYRIGHT POST-TENSIONING INSTITUTE, ALL RIGHT RESERVED Page 8 of 40
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
(C) COPYRIGHT POST-TENSIONING INSTITUTE, ALL RIGHT RESERVED Page 9 of 40
Impact Echo Scanning
2006 PTI TECHNICAL CONFERENCE –SESSION 1 - BRIDGES VACUUM GROUTING MARC TESSIER
(C) COPYRIGHT POST-TENSIONING INSTITUTE, ALL RIGHT RESERVED Page 10 of 40
Impact Echo PrintoutVertical Scan on Empty Steel and Plastic ducts
2006 PTI TECHNICAL CONFERENCE –SESSION 1 - BRIDGES VACUUM GROUTING MARC TESSIER
(C) COPYRIGHT POST-TENSIONING INSTITUTE, ALL RIGHT RESERVED Page 11 of 40
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
(C) COPYRIGHT POST-TENSIONING INSTITUTE, ALL RIGHT RESERVED Page 12 of 40
Drilling Equipment with Metal Sensor
2006 PTI TECHNICAL CONFERENCE –SESSION 1 - BRIDGES VACUUM GROUTING MARC TESSIER
(C) COPYRIGHT POST-TENSIONING INSTITUTE, ALL RIGHT RESERVED Page 13 of 40
Inspecting Voids at Anchorage Area
2006 PTI TECHNICAL CONFERENCE –SESSION 1 - BRIDGES VACUUM GROUTING MARC TESSIER
(C) COPYRIGHT POST-TENSIONING INSTITUTE, ALL RIGHT RESERVED Page 14 of 40
Inspecting Voids along Tendon Length
2006 PTI TECHNICAL CONFERENCE –SESSION 1 - BRIDGES VACUUM GROUTING MARC TESSIER
(C) COPYRIGHT POST-TENSIONING INSTITUTE, ALL RIGHT RESERVED Page 15 of 40
Strands Exposed Inside Tendon Void
2006 PTI TECHNICAL CONFERENCE –SESSION 1 - BRIDGES VACUUM GROUTING MARC TESSIER
(C) COPYRIGHT POST-TENSIONING INSTITUTE, ALL RIGHT RESERVED Page 16 of 40
Water Inside a Void
2006 PTI TECHNICAL CONFERENCE –SESSION 1 - BRIDGES VACUUM GROUTING MARC TESSIER
(C) COPYRIGHT POST-TENSIONING INSTITUTE, ALL RIGHT RESERVED Page 17 of 40
Corroded Strands Inside a PT Cable
2006 PTI TECHNICAL CONFERENCE –SESSION 1 - BRIDGES VACUUM GROUTING MARC TESSIER
(C) COPYRIGHT POST-TENSIONING INSTITUTE, ALL RIGHT RESERVED Page 18 of 40
Corroded Strands Inside a Stay Cable
2006 PTI TECHNICAL CONFERENCE –SESSION 1 - BRIDGES VACUUM GROUTING MARC TESSIER
(C) COPYRIGHT POST-TENSIONING INSTITUTE, ALL RIGHT RESERVED Page 19 of 40
Void Volume Measurement
2006 PTI TECHNICAL CONFERENCE –SESSION 1 - BRIDGES VACUUM GROUTING MARC TESSIER
(C) COPYRIGHT POST-TENSIONING INSTITUTE, ALL RIGHT RESERVED Page 20 of 40
Voids Measurement
Digital Volumeter
2006 PTI TECHNICAL CONFERENCE –SESSION 1 - BRIDGES VACUUM GROUTING MARC TESSIER
(C) COPYRIGHT POST-TENSIONING INSTITUTE, ALL RIGHT RESERVED Page 21 of 40
Void Volume Measurementwith leak rate measurement
2006 PTI TECHNICAL CONFERENCE –SESSION 1 - BRIDGES VACUUM GROUTING MARC TESSIER
(C) COPYRIGHT POST-TENSIONING INSTITUTE, ALL RIGHT RESERVED Page 22 of 40
Verification of NDT Results
• Limited Destructive Testing:
* Manual Duct Opening* Visual Inspection
2006 PTI TECHNICAL CONFERENCE –SESSION 1 - BRIDGES VACUUM GROUTING MARC TESSIER
(C) COPYRIGHT POST-TENSIONING INSTITUTE, ALL RIGHT RESERVED Page 23 of 40
Tendon Condition Assessment
2006 PTI TECHNICAL CONFERENCE –SESSION 1 - BRIDGES VACUUM GROUTING MARC TESSIER
(C) COPYRIGHT POST-TENSIONING INSTITUTE, ALL RIGHT RESERVED Page 24 of 40
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
(C) COPYRIGHT POST-TENSIONING INSTITUTE, ALL RIGHT RESERVED Page 25 of 40
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
(C) COPYRIGHT POST-TENSIONING INSTITUTE, ALL RIGHT RESERVED Page 26 of 40
Vacuum Grouting Equipment
2006 PTI TECHNICAL CONFERENCE –SESSION 1 - BRIDGES VACUUM GROUTING MARC TESSIER
(C) COPYRIGHT POST-TENSIONING INSTITUTE, ALL RIGHT RESERVED Page 27 of 40
Hand Held Colloidal Mixer
2006 PTI TECHNICAL CONFERENCE –SESSION 1 - BRIDGES VACUUM GROUTING MARC TESSIER
(C) COPYRIGHT POST-TENSIONING INSTITUTE, ALL RIGHT RESERVED Page 28 of 40
Vacuum Grouting Mock - Up
2006 PTI TECHNICAL CONFERENCE –SESSION 1 - BRIDGES VACUUM GROUTING MARC TESSIER
(C) COPYRIGHT POST-TENSIONING INSTITUTE, ALL RIGHT RESERVED Page 29 of 40
Tremie Tube Mock-Up – Int. Section
2006 PTI TECHNICAL CONFERENCE –SESSION 1 - BRIDGES VACUUM GROUTING MARC TESSIER
(C) COPYRIGHT POST-TENSIONING INSTITUTE, ALL RIGHT RESERVED Page 30 of 40
Section at Anchorage Location
2006 PTI TECHNICAL CONFERENCE –SESSION 1 - BRIDGES VACUUM GROUTING MARC TESSIER
(C) COPYRIGHT POST-TENSIONING INSTITUTE, ALL RIGHT RESERVED Page 31 of 40
Intermediate Section
2006 PTI TECHNICAL CONFERENCE –SESSION 1 - BRIDGES VACUUM GROUTING MARC TESSIER
(C) COPYRIGHT POST-TENSIONING INSTITUTE, ALL RIGHT RESERVED Page 32 of 40
V measured vs. V injected - Sources of Discrepancy
• Bottle necks
2006 PTI TECHNICAL CONFERENCE –SESSION 1 - BRIDGES VACUUM GROUTING MARC TESSIER
(C) COPYRIGHT POST-TENSIONING INSTITUTE, ALL RIGHT RESERVED Page 33 of 40
• Multiple leaks along tendon
V measured vs. V injected - Sources of Discrepancy
2006 PTI TECHNICAL CONFERENCE –SESSION 1 - BRIDGES VACUUM GROUTING MARC TESSIER
(C) COPYRIGHT POST-TENSIONING INSTITUTE, ALL RIGHT RESERVED Page 34 of 40
• Cracks, honeycombs, voids around duct
V measured vs. V injected - Sources of Discrepancy
2006 PTI TECHNICAL CONFERENCE –SESSION 1 - BRIDGES VACUUM GROUTING MARC TESSIER
(C) COPYRIGHT POST-TENSIONING INSTITUTE, ALL RIGHT RESERVED Page 35 of 40
• Duct communication
V measured vs. V injected - Sources of Discrepancy
2006 PTI TECHNICAL CONFERENCE –SESSION 1 - BRIDGES VACUUM GROUTING MARC TESSIER
(C) COPYRIGHT POST-TENSIONING INSTITUTE, ALL RIGHT RESERVED Page 36 of 40
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
(C) COPYRIGHT POST-TENSIONING INSTITUTE, ALL RIGHT RESERVED Page 37 of 40
2006 PTI TECHNICAL CONFERENCE –SESSION 1 - BRIDGES VACUUM GROUTING MARC TESSIER
(C) COPYRIGHT POST-TENSIONING INSTITUTE, ALL RIGHT RESERVED Page 38 of 40
2006 PTI TECHNICAL CONFERENCE –SESSION 1 - BRIDGES VACUUM GROUTING MARC TESSIER
(C) COPYRIGHT POST-TENSIONING INSTITUTE, ALL RIGHT RESERVED Page 39 of 40
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
(C) COPYRIGHT POST-TENSIONING INSTITUTE, ALL RIGHT RESERVED Page 40 of 40
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