aashto/nsba thermal spray coating specification
TRANSCRIPT
1 l www.steelbridges.orgNational Steel Bridge Alliance
A Division of the American Institute of Steel Construction
AASHTO/NSBA Thermal Spray
Coating Specification
West Regional DirectorTG8 - Chair
Jeff Carlson
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Official Title
• S8.2 – Specification for the Application of Thermal Spray Coatings to Steel Bridges
• A Joint Document –AASHTO/SSPC/NSBA
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Background
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The TSC Process
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Videos
• Canam• Flat Plate
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Specification History
• Started in fall of 2015• Survey to States (34 responses)
• 7 state had TSC spec. (all different)• Task group consisted of ~50• Goal: Develop an agreed upon
Standard Specification for TSC• Balloted via SSPC & AASHTO/NSBA• Last step: Ballot at SCOBS, June 15.
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Owner Involvement
States Involved in Development– New York– Rhode Island– North Carolina– Florida– Texas– California– Illinois– Massachusetts– Virginia– New York State Thruway– FHWA
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Owner Involvement
States Involved in Development– New York (Scott Lagace)– Rhode Island– North Carolina– Florida (Steve Duke)– Texas (Tom Schwerdt)– California– Illinois– Massachusetts– Virginia– New York State Thruway– FHWA
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Key Points in Specification
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Key Points
• Personnel• Equipment• Materials• Surface Preparation• Application of TSC• Sealer and Topcoat• Inspection and Testing• Geometry and Inaccessible Areas
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Comments From States
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State Comments
5 Total Comments:• Minnesota DOT• Texas DOT
• Majority were editorial and formatting comments.
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One Minor Revision
C9.3:Visible oxidation of TSC depends on environmental conditions. Reapplication of TSC over TSC is most likely to occur in the context of a repair or to address insufficient thickness; deliberate use of a partial-thickness “hold coat” followed by later buildup to required thickness is not recommended, although it is permitted by the Joint Standard.
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THE Best Thermal Spray Coating (Metallizing) Specification
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Questions?