bridge preservation...healer sealer vs. thin overlay • healer sealer is faster – approx. 1/3 of...
TRANSCRIPT
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STRUCTURE MAINTENANCEBridge Preservation
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OUR OBJECTIVE
• To support region forces by providing technical
advice, training, specialized materials and
equipment as well as emergency response to
ensure safe, efficient and effective bridge ensure safe, efficient and effective bridge
operations.
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STATEWIDE BRIDGE CREW
• Emergency Response
• Specialized Steel Repairs
• Moveable Bridge Maintenance• Moveable Bridge Maintenance
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EMERGENCY RESPONSE
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TEMPORARY SUPPORTS
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BOLTED REPAIRS
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HEAT STRAIGHTENING
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MOVEABLE BRIDGE
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REGION BRIDGE SUPPORT UNIT
• Reachall Operations
• Material Procurement
• Best Practices
• Specialized Equipment• Specialized Equipment
• Training and Expertise
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MAINTENANCE FOCUS AREAS
• Crack Chasing
• Healer Sealer
• Thin Epoxy Overlay
Deck Patching• Deck Patching
• Expansion Joints
• Painting
• Pressure Relief Joints
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WHO DOES BRIDGE MAINTENANCE?
• MDOT Special Crews
– Each Region Utilizes Direct Forces for Bridge
Maintenance.
• Contract Counties• Contract Counties
– Large Urbanized Areas Utilize Contract Counties As
Well.
• Contractors
– Region Bridge Engineers Include Contract Bridge
Maintenance into Programs.
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HOW MAINTENANCE IS CONDUCTED?
• MDOT Direct Forces and Structure Maintenance
Section Establish Procedures
– New Products
– Techniques– Techniques
– Equipment
• Central Offices Create Special Provisions Based
on Field and Laboratory Testing
• Special Provisions Then Used to Contract Bridge
Maintenance
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EXPANSION JOINTS
• Full Depth
• Partial Depth
• Pourable
• Gland Repair/Splicing• Gland Repair/Splicing
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PARTIAL DEPTH JOINT
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DECK PATCHING
• Urgent Repairs
• Block Outs/End Headers
• Fast Set Materials
• Cold Weather Products• Cold Weather Products
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THIN EPOXY OVERLAYS
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THIN EPOXY OVERLAYS
• Very Prep Sensitive
• Time Consuming
• Utilizes Heavy Equipment
• Provides Waterproof Wearing Surface• Provides Waterproof Wearing Surface
• Improves Traction
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HEALER SEALER (PENETRATING SEALER)
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HEALER SEALER (PENETRATING SEALER)
• Prep Lenient
• Fast
• Mobility
• Light Equipment• Light Equipment
• Seals Cracks
• Maintains Original Traction
• Used as Crack Chaser
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HEALER SEALER VS. THIN OVERLAY
• Healer Sealer is Faster
– Approx. 1/3 of the time of a Thin Overlay
– Improves Mobility
• Sand is Cheaper than Chipped Flint
• Healer Sealer Breathes•– May be used on Box Beams and Stay-In-Place Forms
• Healer Sealer Requires Less Prep
– Quick Shot Blast
– No Need to Remove Lane Lines
• Thin Epoxy Overlay Improves Ride Quality
– May be used to Smooth Imperfections
– Improves Skid Resistance
• Overlay Bridges Cracks, Healer Sealer Penetrates Cracks
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FLOOD COAT TRENDS
• Transition From Thin Epoxy Overlays to Healer Sealers
• Thin Epoxy Overlays Still Have a Unique Benefit
• Healers Sealers are More Cost Effective
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PAVEMENT RELIEF JOINTS (PRJ’S)
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SYMPTOMS OF PAVEMENT GROWTH
• Closed Joint Rails
• Crushed Concrete Railing
• Separation of Tube Railing
• Diagonal (Shear) Deck Cracking in Quadrants
• Distortion in Approach Pavement
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SYMPTOMS OF PAVEMENT GROWTH
• Closed Pin and Hangers in Cold Temps
• Tilted Rockers
• Beam Ends in Contact
• Tilted Backwall
• Abutment Spalls
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FREQUENCY OF REINSTALLATION
• 2-3 YEARS
Source: Burke, M.P. Jr. “Reducing Bridge Damage Caused by Pavement Forces” Farmington Hills, MI Jan.-Feb., 2004
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RELIEF JOINT TRENDS
• Large Increase in Relief Joint Installations in 2009/10
– Increased Awareness
– Less Labor Intensive
– Cost Effective
Major Preventative Tool• Major Preventative Tool
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PAINTING
• All Painting Performed by Contract
• Inefficient to Continue Painting by Direct Forces
– Equipment Costs
– Health Hazards
– Time
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FALSE DECKING
• A Need for a Falling Concrete Containment System
that Maintained Deck Visibility.
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FALSE DECKING
• Constructed of Square Tubing and Chain Link Fencing
• Fabricated per Individual Bridge Specifications
• Easy Installation from Shoulder
• Reusable
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