Spot Painting to Extend Highway Bridge Coating Life: Volume 1: Guidance (2018) / Chapter Skim
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Pages 72-76
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NCHRP Project 14-30 72 APPENDIX A Instructions for Conducting Field Coating Condition Assessments
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NCHRP Project 14-30 73 Field coating condition assessments can be performed in accordance with ASTM D5056, "Standard Guide for Assessing the Condition of Aged Coatings on Steel Surfaces." A more comprehensive approach is provided in SSPC Paint Application Guide 5, "Guide to Maintenance Coating of Steel Structures in Atmospheric Service." Those standards reference typical visual assessments of rust and coatings and procedures for evaluating them along with identifying/stipulating standard physical tests useful for evaluating condition of bridge coatings and the presence of contaminants that may affect existing and future bridge coatings. SSPC Guide 5 provides a complete overview of assessing, programming, performing, and following-up on bridge maintenance activities.
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NCHRP Project 14-30 74 rusting is when most of the rust is concentrated in a few areas. General rusting is when various sizes of rust spots are distributed across the paint surface.
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NCHRP Project 14-30 75 Those determinations can be made by follow-up laboratory testing. Coating samples can be tested for the presence of lead and other hazardous metals using Atomic Absorption Spectroscopy (AAS)
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NCHRP Project 14-30 76 patches (in conjunction with conductivity meters) or by using a proprietary sleeve method with a slightly acidic test solution to extract surface chlorides and analyzed for chloride content using a miniature titration column (Guide 15 methods 4.2.2 and 5.25 respectively)
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