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NCHRP Project 14-30 79 APPENDIX C List of Equipment for Field Coating Assessment (MnDOT)
NCHRP Project 14-30 80 8.2.3.3 Equipment for Physical Assessments Equipment required for evaluation of physical and chemical properties of the existing coating or weathering steel patina depend on the specific tests being performed. General Equipment ⢠Personal Protection Equipment (PPE): suitable for the tasks to be performed and the locations where work will be performed (heights, platforms, buckets, over water). ⢠Markers, notebook/forms, pens, pencils. ⢠Rags and rapid evaporating cleaning agent for localized surface cleaning. ⢠Scraper and wood chisels to collect paint and corrosion product samples. ⢠Bags/containers for collection of samples, debris, scraping, etc. ⢠Digital camera, extra batteries, and reference scale. Assessment Methods and Equipment Adhesion ASTM D3359, Tape Test (Method A, B or both,) ASTM D6677 Knife Test ⢠Utility knife and extra blades, guides for scribing through coating. ⢠Rolls of a tape appropriate for performing Tape Adhesion Tests. ASTM D4541, Pull-Off (Tensile) Adhesion ⢠Pull-Off Adhesion Tester4 loading fixtures (dollies), fine sand paper, and adhesive. Coating and Steel Thickness ASTM D7091 ⢠Dry film thickness gage and appropriate coating thickness standards. ASTM E797/E797M-10, Measuring Thickness (Ultrasonic) ⢠Ultrasonic thickness gage for measuring steel thickness and standards. ASTM D4138, Film Thickness by Destructive, Cross-Sectioning Means1 ⢠Tooke gage or beveling tool and magnifier for examination of coating layers. Chloride5 SSPC-Guide 15, Field Methods for Extraction and Analysis of Soluble Salts ⢠In situ extraction and testing for anions, Table 1, SSPC-Guide 15. ⢠Conductivity: Test solution, conductivity meter and supplies (See Table 1, SSPC-Guide 15). ⢠Laboratory analysis of field collected samples (See Table 2, SSPC-Guide 15). The data collected should be recorded onto standard or custom forms in a notebook or digital device for entry into a bridge and element specific data base. 3 âMeasurement of Dry Film Thickness of Protective Coating Systems by Destructive, Cross-Sectioning Means.â 4 Available equipment options are provided in ASTM D4541. 5 Although chloride is typically the salt of interest testing for other anions and/or conductivity may also be considered.