This study demonstrated that Type 2205 stainless steel strand can be used as a replacement for conventional ASTM A416 steel strands where an increase in service life is required. The benefit and practicality of using Type 2205 stainless steel strand in prestressed piles were determined from two tasks performed in this study.
First, a corrosion assessment was performed on stranded cold worked AISI 1080 carbon steel (hereinafter “SCW1080 steel”) (equivalent to conventional steel strands); cold worked austenitic stainless steel Type 201 modified (hereinafter “CW201 steel”); and stranded heavily cold worked Type 2205 duplex stainless steel (hereinafter “SCW2205 steel”), a currently available duplex stainless steel strand product. Second, the fabrication and placement of several prestressed piles reinforced with SCW2205 steel, which are now part of Virginia bridge structures, were observed.
Laboratory corrosion testing under different exposure conditions was conducted on SCW1080 steel (as a baseline); CW201 steel (with some limited testing on non-cold worked Type 201 modified stainless steel to evaluate cold working effects); and SCW2205 steel. The laboratory studies were augmented with four-point bend and U-bend tests of specimens exposed to field conditions for 295 days. The full report is available from Virginia DOT at http://www.virginiadot.org/vtrc/main/online_reports/pdf/20-R2.pdf
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