841.04 Bituminous Coatings and Paved Inverts.
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
841.01 Description.
a.General . 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 re quired; 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.
b.Forming and Punching of Plates for P ipe. 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 radiu s 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 s hall 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 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.
841.02 Co rrugated 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.
841.03 Corrugated Aluminum.
Corrugated aluminum structural pl ates, 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 s hall 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.
841.04 Bituminous 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).
841.05 Handling and Storage.
841.05 Handling 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. SECTION 846 PIPE CULVERT JOINT SEALERS
846.01 Rigid Pipes.
a.General . 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 insure 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.
b.Bituminous Plastic Cement. Bituminous Plastic Cement meeting the Specifications noted in this Sectio n 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 cu lvert 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 caulking compound gun without pulling or drawing. W hen applied to the joint surfaces, it shall exhibit good adhesive and cohesive properties. The material shall meet the following requirements:
1.When applied in a layer 1/16 to 1/8 inch {1.5 mm to 3 mm} thick on a tinned metal panel and cured at room temp erature for 24 hours, the Bituminous Plastic Cement shall set to a tough, plastic coating, free from blisters. Minimum Maximum
2.Grease Cone Penetration 175 250
3.Unit Weight {Unit Mass}, pounds per gallon {kilograms per liter} 9.75 {1.17} -
4.Non-Volatile 70 -
5.Ash, by ignition, by weights {masses} 15 45 Tests: Methods of tests shall be in accordance with the following: Grease Cone Penetration AASHTO T 187 Non-Volatile ASTM D 2939 Ash ASTM D 128
c.Preformed Flexible Joint Sealant Preformed Flexible joint sealant meeting the requirements of this Section may be used on joints for Arch and or Horizontal Elliptical Pipe and Precast box culverts. This material shall meet the latest requirements of ASTM C990 “Standard Specification for Joints for Concrete Pipe, Manholes, and Precast Box Sections Using Preformed Flexible Joint Sealants”. The material shall be installed per the manufacturer’s recommendations.
Source: Alabama Standard Specifications for Highway Construction, 2022 Edition. Pages 766–766 of 934.