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<br />(2) Bituminous Coating. This is the most common protective measure used <br />on corrugated steel plpe. This procedure can increase the resistance <br />of metal pipe to acidic conditions if the coating is properly applied <br />and remains in place. Careful handling during transportation, <br />storage, and placement is required to avoid damage to the coating. <br />Bituminous coatings can also be damaged by abrasion. Field repairs <br />should be made when bare metal has been exposed. Fiber binding is <br />sometimes used to improve the adherence of bituminous material to the <br />metallic-coated pipe. <br /> <br />(3) Bituminous Paved Inverts. Paving the inverts of corrugated metal <br />culverts to provide a smooth flow and to protect the metal has <br />sometimes been an effective protection from particularly abrasive and <br />corrosive environments. Bituminous paving is usually at least <br />liB-inch (3 mm) thick over the inner crest of the corrugations. <br />Generally only the lower quadrant of the pipe interior is paved. <br />Fiber binding is sometimes used to improve the adherence of <br />bituminous material to the metallic-coated pipe. <br /> <br />(4) Other Coatings. There are several other coating materials that are <br />being used to some degree throughout the country. Polymeric, epoxy, <br />fiberglass, clay, and concrete field paving, have all been used as <br />protection against corrosion. Galvanizing is the most common of the <br />metallic coatings used for steel. It involves the application of a <br />thin layer of zinc on the metal culvert. Dther metallic coatings <br />used to protect steel culverts are aluminum and aluminum-zinc. <br /> <br />44 <br />