- 817 - SECTION 1022 -- DOWEL BARS
1022.01 Description
1.Coated dowel bars for use across transverse joints shall conform to the requirements of AASHTO M 254.
2.Coated dowel bars for use across transverse joints shall consist of a steel core with an organic covering and shall comply with the requirements of AASHTO M 254, Corrosion Resistant Coated Dowel Bars except:
a.The steel cores shall be sm ooth round bars of the diameters shown in the contract and shall comply with ASTM A 615/A 615M, Grade 40 or 60 (300 or 420). ASTM A 36, Grade 36 steel is an acceptable substitute, provided the steel meets or exceeds the chemical and mechanical requirements of ASTM A 615, Grade 40.
b.The coating on the latera l surface of the dowel may be eliminated for approximately 2 inches (50 mm) on one end of the dowel for welding purposes. Sheared or cut ends of fabricated dowels may be coated or un-coated, at the discretion of the fabricator or supplier.
c.Both Type A and Type B coated dowel bars shall be coated with a bond breaker shown on the D epartment’s Approved Products List, dipped in asphalt or paraffin, or greased in accordance with the specified requirements as shown in the contract.
1022.02 Acceptance Requirements
1.A plant supplying coated dowel bars under these Specifications shall meet the Acceptance Requirement s as set forth in Section 1021 for Epoxy Coated Reinforcing Steel. A certification by the manufacturer of the coating material and/or the coating app licator is required. The certification shall consist of a statement to the effect that the coating material represented conforms to AASHTO M 254 and the requirements in this Section. The certifications shall be fu rnished in triplicate and include copies of the test results. The c oating applicator shall also furnish 3 copies of the mill test showing physical and chemical test results of the steel used in the fabrication of t he coated bars.
2.In addition to these certificates , two 6-foot (1.8 m) samples of the coated bar (for tension testing and bend testing) of each size bar and each heat number shall be sent to the De partment’s Materials and Research Laboratory, Lincoln, Nebraska. These bars will be properly identified with tags showing the size and heat number. - 818 - SECTION 1023 -- COLD-DRAWN STEEL WIRE FOR CONCRETE REINFORCEMENT
1023.01 Description
1.Cold-drawn steel wire for concrete reinforcement shall conform to the requirements of AASHTO M 32.
1023.02 Acceptance Requirements
1.Acceptance shall be based on sampling and testing requirements in accordance with the Department’s Materials Sampling Guide .
Source: Nebraska Standard Specifications for Highway Construction, 2017 Edition. Pages 851–851 of 1,048.