SECTION 821 — STRUCTURAL COATINGS
821.01 DESCRIPTION. This section covers requirements for structural coating systems
used in bridge construction and maintenance.
821.02 GENERAL REQUIREMENTS. Select structural coatings systems conforming
to this section and included on the Department’s List of Approved Materials. Use only coating system components that are factory mixed and delivered ready for use. Do not allow the use of partial kits. Sediment formed during shipment must be easily dispersed with a power mixer to produce a smooth, uniform coating having good spreading characteristics. Reject coatings that excessively gel, or cakes in the container. Ensure the coatings produce a smooth uniform finish without sags or streaks. Ensure successive coating applications, i.e. intermediate coat to prime coat, differ in color a minimum of 10.0 ΔE*. The following colors are standard colors for use in the production of structural coatings. The name and Federal Standard 595B color number provided are for reference only. Manufacturers are to produce finish coat colors that comply within 2.0 ΔE* of the L* a* b* values listed below or as specified in the contract. Color Fed Standard 595B No. L* a* b* Gray X6187 48.17 -3.54 -0.87 Camo Green X4172 45.17 -12.70 9.86 Dark Green X4066 24.95 -35.59 5.82 Grass Green X4272 58.30 -21.64 12.26 Light Blue n/a 66.56 -7.26 -20.10 Medium Blue X5180 39.35 -0.12 -42.76 Kentuck y Blue X5095 35.44 9.83 -48.11 Buttercream Yellow X3798 88.41 -1.92 35.02 Yellow X3618 81.82 -0.57 57.55 Light Bei ge X6521 74.71 1.92 9.88 Aluminized Silve r n/a 66.56 -0.59 -0.33 Maroon X0160 33.65 28.49 6.61 Light Gray For Concrete X6492 74.94 -1.54 3.92 Store coatings at temperatures above 32 ºF and below the most restrictive maximum ambient air temperature for the coating system stated on the coating manufacturer’s product data sheets. Equip storage areas with high- low thermometers capable of measuring and recording the appropriate temperature range. Do not store coating systems in direct sunlight. The Engineer will reject or retest coatings exposed to temperatures outside this range.
821.03 APPROVAL. The Department will approve structural coating systems based on
performance data obtained in accordance with KM 64-266.
821.04 SAMPLING AND TESTING. The Department will sample and test each
shipment of each lot of coating delivered to the project in accordance with the Department’s Materials Field Sampling Manual. Allow the Department 10 working days from the date received by the Division of Materials to test an d approve samples. Retest coatings that are not used within 6 months from their approval. Additionally, retest coatings that are stored between painting seasons. Remove rejected coatings from the job site before starting painting operations.
821.05 CERTIFICATION. Submit manufacturer’s certification stating conformance to
the requirements of this section for each shipment of approved structural coatings delivered for use on projects. Clearly state the manufacturer and product name as listed in the Department’s List of Approved Materials. Identify the lot number(s), expiration date, and 821-1 quantity of each coating or coating component.
821.06 ACCEPTANCE. The Department will accept structural coating systems based
on verification of inclusion on the Department’s List of Approved Materials, compliance of the manufacturer’s certification, verification the coatings will not exceed the expiration date, and acceptable tests results obtained by the Department in accordance with Table 1.
821.07 Acceptance of Non-Specif Ication Compliant Coatings.
The Department may accept coatings found to be in non-conformance to the Specification Acceptance Range at a reduction in pay, see Table 1. Coatings with analytical test results not in conformance to the Specification Acceptance Range but within the Acceptance Range with Deduction may be accepted for incorporation into the project with applicable reductions in pay. Deductions are cumulative to a maximum of 60% reduction in pay applied to the Contractors’ invoiced unit cost for the coating. Coatings with 3 or more analytical tests resulting in non-conformance to the Specification Acceptance Range or any analytical test result exceeding the Acceptance Range with Deduction will be rejected and removed from the project. Do not allow transfer of structural coating materials between projects that have analytical test results in the Acceptance Range with deduction. 821-2
821.08 Table 1.
COATINGS PRICE ADJUSTMENT SCHEDULE Analytical Test Spec ification Acceptance Range Acceptance Range with Deduction Deduction Applied to Unit Cost Density ASTM D1475 Target Value ± 0.25 lbs/gal Target Value ± 0.26 to 0.50 lbs/gal 20% Viscosity ASTM D562 Target Value ± 10 KU Weight Solids ASTM D2369 Target Value ± 2.0% Target Value ± 2.1 to 3.0% 30% Volume Solids ASTM D2697 Target Value ± 2.0% Target Value ± 2.1 to 3.0% 30% Pigment ASTM D2698 ASTM D 3723 Target Value ± 2.0% Target Value ± 2.1 to 3.0% 30% Metallic Pigment Content ASTM D521 Target Value ± 2.0% Target Value ± 2.1 to 3.0% 30% Volatile Organic Compounds ASTM D3960 450 g/L Maximum Color ASTM D2244 2.0 ΔE*Maximum 2.1 to 3.0 ΔE* Maximum 10% Contrast Ratio (at 5miles wft.) 0.98 Minimum Color Differential 10.0 ΔE*Minimum 9.9 to 8.0 ΔE* Minimum 10% Gloss ASTM D523 Target Value ± 10 Gloss Units Sag Resistance ASTM D4400 Target Value ± 20% Drying Schedule ASTM D1640 Target Value ± 20% Pot Life Target Value ± 10 KU MEK 3 Minimum Resin Content ASTM D1652 ASTM D2074 AASHTO TP67 Target Value ± 0.5% Target Value ± 0.6 to 0.8% 30% 821-3 SECTION 822 ELASTOMERIC BEARING PADS
822.01 ELASTOMERIC BEARING PADS. Furnish elastomeric bearing pads
conforming to the design and dimensions as specified in the Plans and to the AASHTO LRFD Bridge Construction Specifications, Section 18. Use bearings that are low temperature Grade 3 with durometer hardness of 50 and that conform to the load test requirements corresponding to Design Method A. 822-1