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Abstract:This report is the result of a research program in which various types of submerged drainage structures were evaluated in an effort to determine the life expectancy of such a structure. California-s method of predicting the behavior pattern of submerged metal pipe, California No. 643-B, was found to be applicable to Louisiana Soils, and a good correlation coefficient was obtained. By using the laboratory values obtained for resistivity and pH, the years to perforation for a metal structure can be estimated disregarding the abrasive forces which occur during peak discharge conditions.
It was also found that an additional 8 years prolonged life of a structure was obtained by over coating the galvanized steel with a moderate thickness of asphalt. This asphalt coating, protected from UV light, actually served as a protected barrier for the galvanized surface and thereby reduced the sacrificial properties of the zinc.
Summary of Service Life Expectancy for Highway Districts are included which predict an estimated service life of the pipe in question according to the various soil types present within the district together with the average pH and resistivity values possibly encountered in the soil types.
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