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506.31 Submittals Submit an application procedure and QC Plan for review by the
Department prior to beginning wor k. Submit a certified analysis of the feedstock to the Department. Submit sample copies of QC records for review. Subm it copies of applicator qualifications, job history, etc . Provide the name and qualific ations of the QCI.
506.32 Surface Preparation Prior to abrasive blast cleaning, r ound all corners exposed
in the assembled product to approximately a 3/32 inch radius. A series of tangents to the approximate radius will be considered acceptable. Remove h ardened condition on thermal cut surfaces. Abrasive blast clean all surfaces to be coated in accordance with The Standard and SSPC-SP 5, White Metal Blast Cleaning (SP 5). Use SSPC -VIS. 1 as a visual standard to determine accep table cleanliness. Inspect t he substrate immediately before spray application. The anchor profile shall be per The Standard (minimum 2.5 m ils). Measure and record the anchor profile in accordance with ASTM D4417 Method B or C (Replica Tape) or both on each plane to be sprayed or at 120 ° intervals on pipe or tu be. Measure at the frequency in The Standard. Angular blast media shall conform with The Sta ndard. If the anchor profile fails to meet the minimum required profile, re-blast th e substrate until the required anchor profile is achieved. If compressed air is used for abrasive blast cleaning, perform a blotter test in accordance with ASTM D4285 at the beginning of each shift. Empty moisture traps at the beginning of each shift and at any time thereafter when moistur e appears to be present on the substrate. Notify the QAI prior to performing the test in order that the QAI can witness the blotter test.
506.33 TSC Requirements The coating thickness shall be a minim um of 14 mils. The
DFT on faying surfaces shall not exceed the thickness tested fo r Class B slip coefficient rating. The TSC shall have a minimum tensile bond per The Stand ard. Test the tensile bond in accordance with ASTM D4541. The frequency of testing shall b e per The Standard. The test location will be as directed by the QAI. The specified ten sile force shall be applied to the TSC and removed. If the test does not reveal a failure of the TSC, the tensile bond shall be considered acceptable. Repai r or recoat unacceptable work. Tensile testing may be performed on witness panels coated by each technician on each s hift TSC is applied; notify the QAI so witness panel coating may be observed. Perform a bend test as described The Standard, at the beginning of each shift. If the bend test fails, take corrective action and perform another tes t. After performing the bend test successfully a number of times, the Fabrication Engineer m ay reduce the frequency of testing. Document the results of the tensile bond test and bend test and provide the results to the Department. Satisfactory bend test results with 7-12 mils t hickness will be acceptable. The TSC shall have a uniform appearance, free from blistering, cracks, loose particles, or exposed steel substrate when examined with 10-X magnificatio n. 5-97
506.34 TSC Application Record the batch and lot numbers of the consumables.
Measure the environmental conditions in the immediate vicinity of the p iece(s) being coated during the coating operation and during the entire cure period for intermediate and top coat. Provide two data loggers capable of measuring ambient hu midity and temperature. The data loggers shall come with software that can download the data onto a computer. Print out the data and provide a copy to the QAI for review pri or to applying the subsequent coat of paint. Place the data loggers in the immedi ate vicinity of the coating operation during the entire application and curing cycl e. The data will be used to determine that the cure/recoat time requirements for each coat have been met. Failure to comply will result in the coating being cured for the maximum t ime necessary to assure adequate cure as de termined by the Fabrication Engineer.
506.35 Seal Coat and Top Coat Application (Paint) Apply a wash primer and/or seal
coat of 2 to 3 mils thickness . The seal coat shall be compatible with an epoxy intermediate coat and a polyurethane top coat from the NEPCOAT QPL. Provide certification of compatibility between the seal coat and interm ediate coat from the intermediate coat/top coat manuf acturer. Top flanges of beams r equiring shear connectors shall receive a seal coat only.
506.36 Materials Provide mater ials in accordance with 506.11.
506.37 Mixing and Application Mix and apply in acc ordance with 506.14.
506.38 Dry Film Thickness Measure and record the DFT in accord ance with 506.15.
506.39 Touch-up and Repairs Repai r damage to TSC by re-blastin g the damaged area
and re-applying TSC in accordance with this Specification. Per form touch-up and repairs to paint in accordance with 506.16. FUSION BONDED EPOXY COATING
506.40 Description This work shall consist of surface preparat ion and application of
Fusion-Bonded Epoxy (FBE) coating, in accordance with the Plans and this Specification, including measuring and documenting DFT and testing for holiday s and other discontinuities in the epoxy coating. The FBE shall be applied to all surface areas indicated on the Plans. Perform surface preparation and application of FBE in accordanc e with the following Specifications:
A.Steel pipe pile- ASTM A972, Fusion Bonded Epoxy-Coated Pipe Pile
Source: Maine Standard Specifications for Road and Bridge Construction, 2020 Edition. Pages 388–389 of 817.