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Accelerated low-water corrosion (ALWC) is a specific corrosion phenomenon which is microbially influenced and leads to premature perforation of some steel sheet piling walls at the low-water level. Although the mechanisms are not fully understood, the primary requirement of end-users is for practical engineering solutions. Therefore this multi-partner investigation was carried out with the following objectives:
-To develop methods of assessing the risk of ALWC.
-To evaluate possible methods of protecting steel piling structures against ALWC.

A database was established from a detailed examination of 22 sheet steel piling structures (both affected and unaffected). A statistical analysis of this database led to a preliminary risk-assessment model. Some additional analyses showed other physical and chemical differences between the two groups of sites.

Four possible protection methods were examined, i.e. low-alloy steels, periodic cleaning of steel sheet piling, cathodic protection and organic coating. Cathodic protection and organic coatings, alone or in combination, gave a high level of protection and can be recommended. Finally, a test programme carried out on an actual structure affected by ALWC provided a suitable repair procedure.dure.

Additional information

Authors: RAHARINAIVO A, Laboratoire Central des Ponts & Chaussées, Paris (FR);GUBNER R, University of Portsmouth (UK);BEECH I, University of Portsmouth (UK);KARIUS R, Krupp-Hoesch, Dortmund (DE);CHAO W T, British Steel, Rotherham (GB);MARSH E, British Steel, Rotherham (GB);MOULIN J M, ProfilARBED Recherches, Esch-sur-Alzette (LU)
Bibliographic Reference: EUR 20043 EN (2001), pp.139. Euro: 20.50
Availability: Available from EUR-OP sales agents. URL:
ISBN: ISBN:92-894-2068-5
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