841STRUCTURAL PLATE FOR PIPE, PIPE-ARCHES AND

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Pads shall be manufactured in accordance with plan details and shop drawings with applied tolerances as established in AASHTO M 251. Type 5 bearing pads shall in addition to AASHTO M 251 meet the following tolerances: FLAT PTFE SLIDING BEARING TOLERANCES ITEM THICKNESS DIMENSION FLATNESS OR OUT-OF-ROUND PTFE -0.000" , +0.0063" {-0.00mm, +0.160mm} -0.000", +0.030" {-0.00mm, +0.76mm} 0.001 X Nominal Thickness Stainless Steel -0.000" , +0.0063" {-0.00mm, +0.160mm} -0.000", +0.125" {-0.00mm, +3.18mm} 0.001 X Nominal Thickness

837.03Marking, Sampling, and Testing

Bearings shall be divided into lots and marked in accordance with AASHTO M 251, Appendix X1 as modified in ALDOT-368 to allow pads of the same type but different sizes to be grouped together in a lot. Bearings less than 3 inches {75 mm} in thickness may have markings placed on the top surface in lieu of the side. Lots may contain up to 3 additional pads for sampling purposes. Sampling, for Departmental verification testing, shall be in accordance with ALDOT 368 and the ALDOT Testing Manual. In addition to ALDOT testing, manufacturers shall, as a minimum, test all lots to Level 1 of AASHTO M 251, Appendix X1. Manufacturers shall furnish certified test reports showing actual test results for all parameters found in Table X1 of AASHTO M 251. In addition, steel reinforced pads shall have test results covering the peel strength test and certification that all pads have been proof loaded and passed the requirements for Level 1 criteria, as well as a mill test report for the steel laminates showing the actual physical and chemical analysis for the heat of steel. Mill test reports shall also be submitted for all bearing plates. The manufacturer shall furnish certification that the Type 5 bearing assembly meets the requirement for the maximum allowable coefficient of friction between the PTFE and the stainless steel sheet. STRUCTURAL PLATE FOR PIPE, PIPE-ARCHES AND ARCHES

841.01Description

Corrugated metal structural plate pipe, pipe-arches, and arches shall meet requirements noted in this Section and the details shown on the plans. Acceptance of material will be based on job site inspection for workmanship and compliance with fabrication requirements. A certificate of compliance for each shipment as per AASHTO requirements will not be required; however, a copy of the manufacturer's analysis of the sheets used in the manufacture of the pipe shall be furnished. For correlation of specified plate thickness and allowable fill heights, see plan details.

Plates shall be formed to provide lap joints. The bolt holes shall be so punched that all plates having like dimensions, curvature, and the same number of bolts per meter of seam shall be interchangeable. Each plate shall be curved to the proper radius so that the cross-sectional dimensions of the finished structure will be as indicated on the plans. Plates for forming skewed or sloped ends shall be cut to give the angle of skew or slope specified. Burned edges shall be free from oxide and burrs, and shall present a workmanlike finish. Elongation of structural plate pipe may be accomplished by forming plates so that the finished pipe is elliptical in shape with the vertical diameter approximately five percent greater than the nominal diameter of the pipe. Plates for a pipe arch shall form a cross section made up of four circular arcs tangent to each other at their junctions and symmetrical about the vertical axis. The top shall be an arc of not more than 180 PIPE CULVERT JOINT SEALERS 723

degrees nor less than 155 degrees. The bottom shall be an arc of not more than 50 degrees nor less than 10 degrees. The top shall be joined at each end to the bottom by an arc having a radius between 16 and 32 inches {400 and 800 mm} and of not more than 87½ degrees nor less than 75 degrees.

841.02Corrugated Steel

Corrugated steel structural plates, fasteners, etc. shall conform to the requirements of AASHTO M 167, with plates hot-dipped galvanized after fabrication, punching, and cutting.

841.03Corrugated Aluminum

Corrugated aluminum structural plates, fasteners, etc. shall conform to the requirements of AASHTO M 219 modified to include the following: Bolt holes along those edges of the plates that will form longitudinal seams in the finished structure shall be on a double row with center to center dimension 1.75 inches {45 mm}. In all structures the longitudinal joint shall be composed of two bolts in the valley and crest of each corrugation. Bolt holes along those edges of the plates that will form circumferential seams in the finished structure shall provide for a bolt spacing of not more than 9.625 inches {245 mm}. The minimum distance from center of hole to edge of plate shall be not less than 1.75 times the diameter of the bolt.

841.04Bituminous Coatings and Paved Inverts

Bituminous coatings shall be in accordance with the provisions of Subarticle 850.02(c); however, field coatings may be applied in accordance with the provisions of AASHTO M 243. Paved inverts shall be in accordance with the provisions of Subarticle 850.02(c); however, field application may be accomplished using the asphalt mastic noted in AASHTO M 243, applied as noted therein to the depth and width required by Subarticle 850.02(c).

841.05Handling and Storage

Handling and storage of plates shall be as specified in Subarticle 850.02(f) for pipe. Any spelter damaged in handling shall be painted with two coats of approved galvanizing repair paint, Section 855, or an approved zinc spelter paint. PIPE CULVERT JOINT SEALERS

846.01Rigid Pipes

Allowable joint materials will be determined based on the shape of the pipe culvert as given in the table below. Pipe Culvert Shape Allowable Joint Materials Round Rubber Gasket Arch, Horizontal Elliptical, and Precast Culverts Rubber Gasket, Bituminous Plastic Cement, or Preformed Flexible Joint Sealant Note: The joint sealing material requirements of this specification are provided to ensure the installed pipe joints provide a soil tight performance. If a more stringent joint performance requirement is deemed necessary during the design phase, the Engineer may specify other materials or a different combination of materials specified above.

Bituminous Plastic Cement meeting the Specifications noted in this Section may be used on joints for Arch and or Horizontal Elliptical Pipe and Precast box culverts. This Specification covers a bituminous joint sealing compound which may be applied cold for sealing the joints of bell and spigot or tongue and groove storm or culvert pipe. Material furnished shall be composed of a steam-refined petroleum asphalt dissolved in a suitable solvent and stiffened with a mineral filler. Properties: The Bituminous Plastic Cement shall be a smooth uniform mixture, not thickened or livered, and it shall show no separation which cannot be easily overcome by stirring. The material shall be of such consistency and properties that it can be readily applied with a trowel, putty knife, or