AASHTO M 245-20 PDF Download

AASHTO M 245-20 is a standard specification that covers the use of polymer-precoated corrugated steel pipe for sewer and drainage applications. This specification is specifically designed for storm water drainage, underdrains, culvert construction, and similar uses, and it is not typically used for sanitary or industrial waste conveyance. The steel sheet used for the pipe fabrication is coated with a polymer protective coating, which provides additional protection against abrasion and corrosion compared to metallic-coated pipes without the polymer coating. However, in severe environments, corrosion problems may still occur with accessory items such as rivets or coupling band hardware that lack a polymer coating. In such cases, additional protection can be provided by using coatings applied after fabrication. It's important to note that this specification does not include requirements for bedding, backfill, or the relationship between earth cover load and sheet thickness of the pipe. The successful performance of the polymer-precoated corrugated steel pipe depends on factors such as proper sheet thickness selection, appropriate bedding and backfill, controlled manufacturing in the plant, and careful installation following the procedures described in AASHTO's Standard Specifications for Highway Bridges.