Home About us News Work Groups Design Plant Innovation Job Reports Search Sponsors Login Terms & Conditions Work Groups Workgroup A Workgroup B Workgroup C Workgroup D Workgroup E Workgroup F Workgroup G Steering Committee Work Group H WORK GROUP D Durability: Sacrifical steel, ALWC, coatings, cathodic protection, new steel grades Workgroup Leader                                                       Workgroup members David Rowbottom - Tata Steel                                                 Steve Cross - Royal Haskoning                                                                                                   David Baxtor - ArcelorMittal                                                                                                   Mike Hodgson - BAM Nuttall The corrosion process – a general introduction. The long term performance of steel products exposed to the elements has been studied for many years by both academia and the steel manufacturers which has not only established the factors that influence the corrosion process but also allowed methods for addressing the effects to be developed. The group will produce a general introduction to the corrosion process indicating the factors that affect the performance of steel elements in different environments. Deliverables: Report and presentation The corrosion process – special situations. General corrosion activity will apply to the vast majority of piling locations but there will be extreme cases where the effects of corrosion differ significantly from the norm. An example of this is the phenomenon of Accelerated Low Water Corrosion (ALWC) which can have a devastating effect on construction products if the cause is not dealt with. The group will produce a report on the subject including definitions of MIC and ALWC, field identification of the problem and methods of addressing it on new and established structures. Deliverable: Report The corrosion process – Design The durability of a proposed solution needs to be established to ensure that it offers the most cost effective solution to the problem. Codes of practice for the design of steel piles (ie EN1993-5) provide designers with information concerning the rate of corrosion to be adopted when assessing life expectancy. The group will prepare sample calculations for sheet and high modulus piles, UBP/UC bearing piles and marine tubes which demonstrate how the life expectancy of a particular element can be determined and how that life expectancy can be enhanced by the introduction of additional measures. The cost effectiveness of the various proposals will be demonstrated by assessing the cost of each option. Deliverable: Calculation sheets and list of current costs The corrosion process – Protective systems The durability of steel elements can be enhanced by the introduction of protective measures ranging from barriers (ie paint or concrete encasement) which separate the steel from the corrosive environment to systems that interrupt the electrochemical process (ie cathodic protection). It is also possible to specify steel chemistries that are naturally more resistant to corrosion activities. The group will prepare a report outlining the available options for enhancement of the life expectancy of steel elements including an assessment of the life of each system and maintenance implications and will attempt to provide real costs for the various options. Deliverable: Report Updated by Mark Bramley, 06/03/2013 Printer friendly page

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