- 812 - SECTION 1020 -- STEEL BARS FOR CONCRETE REINFORCEMENT
1020.01 Description
1.Steel tie bars for longitudinal joint reinforcement in concrete pavements shall be epoxy coated and def ormed Grade 40 or 60 billet steel as shown in the contract, Specifications or Special Provisions.
1020.02 Material Characteristics
1.Billet steel bars shall conf orm to the requirements of ASTM A 615/A 615M.
2.Epoxy coatings shall conform to the requirements in Section 1021.
1020.03 Acceptance Requirements
1.Acceptance shall be based on sa mpling, testing, and certification requirements in accordance with the Department’s Materials Sampling Guide.
2.Steel may need to meet Buy America requirements. - 813 - SECTION 1021 -- EPOXY COATED REINFORCING STEEL
1021.01 Description
1.Epoxy coated bars for concrete reinforcement shall conform to the requirements of ASTM A 775/A 775 M, Section 1020, and as shown in the contract. The bars shall be free of cont aminants such as oil, grease, paint, slivers, or any other imperfections wh ich may be detrimental to the coating process.
2.All reinforcing bars furnished under this item shall be given a protective coating of a fusion bonded epoxy resin.
1021.02 Material Characteristics
1.The coating shall be applied as an electrostatically charged dry powder sprayed onto a grounded steel bar using an electrostatic spray gun. The powder may be applied to either a hot or cold bar. The coated bar shall be given a thermal treatment specified by the manufacturer of the epoxy resin which will provide a fully cured finished coating.
2.The coating material shall be a powdered epoxy resin prequalified by evaluation as described in ASTM A 775/A 775 M. Tests shall be performed by the National Bur eau of Standards (NBS), a qualified independent testing laboratory, or a state laboratory approved by the Department’s Materials and Research Div ision. Approval of material by an independent or state laboratory is subject to the Engineer's review of the test data.
3.The manufacturer of the epoxy re sin shall also supply the coating applicator with all other information and recommendations essential to the proper use and performance of the po wdered resin as a coating. An authorized representative of the m anufacturer shall provide written certification to the applic ator that the powdered resin furnished for coatings is the exact formulation that was prequalified by the NBS or other testing agency.
4.At the request of the Engineer , the coating applicator shall provide a representative 7 ounce (200 g) sample of the resin powder used to coat each lot of bars. The sample shall be pa ckaged in an air-tight container with identification by lot number.
5.The approved powdered epoxy resins are on the Department’s Approved Products List.
6.A suitable patching material com patible with the coating and inert in concrete shall be made available to th e Contractor by the manufacturer of the epoxy resin for repair of damaged c oating areas at the applicator's plant or in the field. The patching or repair shall be performed in accordance with the recommendations of the material manufacturer.
7.A film thickness after curing of 7 to 12 mils (180 to 300 m) shall be applied in a uniform, smooth coat with no discontinuities, except as provided herein. Thickness of the film shall be measured on a representative number of bars from each production lot by the same method outlined in ASTM G 12 for measurement of film thickne ss of pipeline coatings on steel.
8.The coating shall be checked a fter curing for continuity of coating and shall be free from holes, voids, co ntamination, cracks, or other damaged areas. The average number of holidays per foot (300 mm) shall not exceed
Source: Nebraska Standard Specifications for Highway Construction, 2017 Edition. Pages 846–846 of 1,048.