United States Department of Transportation
i
Galvanized and Aluminized Pipe Durability Field Review and Evaluation
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2019-09-01
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[PDF-2.31 MB]
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Edition:Final Report, October 2015–August 2018
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Abstract:Two studies were conducted by the Kansas Department of Transportation (KDOT) in the 1980s to evaluate the performance of corrugated metal pipe (CMP) after a 1974 pipe policy change. This report is a follow-up study to evaluate the impact of the study initiated in 1989 and another pipe policy change in 2001. A total of 81 CMPs were inspected in Districts One, Three, and Four; 41 of these CMPs were also surveyed in 1989. The inspection methodology for each CMP included visual inspection, general notes on flow conditions in and around the CMP, any observations of structural compromise, Global Positioning System (GPS) coordinates, and photographs of the CMP. Visual inspections included assessing the CMP at the crown, invert, interior sides, and exterior on both ends. The deterioration rates of all CMPs were determined. The findings support previous results that indicated increased deterioration rates following the 1974 policy change and showed reduced deterioration rates since the 1989 study. Furthermore, the 2001 policy allowing Aluminized Type 2 CMP under specific site conditions showed deterioration rates similar to those before the 1974 study. A pilot study was also conducted to investigate an alternative method for estimating deterioration rates using a soil leachate analysis.
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