Soils, corrosion steel piling

Steel W beam (Fig. 8-5soil corrosion a problem in underground flowing-water conditions. 

Corrosion current density, and corrosion rate, can be calculated when the entire specimen is polarized and its surface area is known. This is the case for finite cirea specimens, as illustrated in Fig. 1 for steel piling. The reference electrode is located at the soil surface approximately 30 m from the WE. For these measurements, each of the seven piles was polarized using the centrally located pile as the CE with the REF at a fixed location. In this way, measurements could be duplicated from year to year md the results compared [5]. From this corrosion current measured over a period of time, in this case 14 years, an estimate of weight loss C2in be calculated. 

Case No. 1 Many of our infrastructures are built on soils containing aggressive chemical ions and moisture, supported on steel piles. There are no available data on the corrosion rate of such piles exposed to these types of soils, nor the long-term durability of such combinations, nor is there any standard test procedure for evaluating this over the structural life. It should be noted that one set of soldier piles supporting a 60-stoiy office building in a marine environment was recently inspected by basement sidewall excavation. The 27 in. web by 14 in. fiange by 75 ft deep piles had suffered more than 15 % web loss in less than three years service. 

At a conference on DurabiUty of Steel Pilings in Soil and Marine Environments in 1984, it was reported that bacterial corrosion of steel piling in marine environments was not significant and. .. marine fouling appeared to be mostly beneficial . See [16] for more details. 

Javaherdashti R, Vimpani P (2003) Corrosion of steel piles in soils containing SRB a review. Proceedings of Corrosion Control and NDT, 23-26 November 2003, Melbourne, Austraha... 

Dismuke, T. Coburn, S. K. Hirsch, C. M. Handbook of Corrosion Protection for Steel Pile Structures in Marine Environments, sl Ed., Washington, D.C., American Iron and Steel Institute, 1981. Kloppel, H. Fliedner, A. Kordel, W. Behaviour And ecotoxicol-ogy of Aluminium in Soil and Water, Chemosphere, 1997, 351, 353-363. 

Typical steel structures used underground in contact with soils are pipelines, utility pipings and pilings. Pipelines are generally protected against corrosion with coatings and by cathodic protection. Driven pilings are commonly used in bare condition. 

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