United States Department of Transportation
i
Evaluation of drainage pipe by field experimentation and supplemental laboratory experimentation : final report.
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1985-03-01
[PDF-2.86 MB]
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Abstract:Louisiana's Office of Highways reacts to a major problem when it attempts to shape and control drainage patterns along its right-of-ways. The Office's design engineers meet this challenge through proper section design and appropriate application of drainage structures.
Perhaps the most common structure that these design engineers use is the drainage pipe-primarily concrete and metal. This study is investigating the durability properties of metal drainage pipe in Louisiana, where durability of such pipe as important as strength because of harsh environs which promote corrosion.
Beginning in August 1973, a series of pipe types of coated and uncoated galvanized steel and aluminum were installed in pairs at eleven various sites throughout Louisiana. Periodically, one each of the sixteen pairs of pipe types were evaluated to determine the corrosive effect of the eleven environments upon the test pipes. This fourth and final evaluation (report) relates the observations concerning the condition of the test pipes after a maximum of ten years of field exposure.
It was found that, generally, the 16-gauge asphalt coated aluminum, the 14-gauge asbestos bonded asphalt coated galvanized steel and the 16-gauge galvanized steel with a 12-mil interior and 5-mil exterior polyethylene coating were the test pipes with the most resistance to corrosion at the majority of the test sites. It was also found that although all of the coatings provided added resistance to corrosion, to some degree, thicker coatings tested provided increased protection to the base metal. Based upon the results of this study, the adequacy of predicting pipe life by utilizing the minimum resistivity and pH of the environment for Louisiana conditions is also considered.
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