Design and construction of precast piles with stainless reinforcing steel.
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2014-02-01
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Abstract:The service life of prestressed concrete piles is, in part, dictated by the time required to corrode the steel once
chloride ions are at the surface of the steel. Stainless steel materials, although limited in availability in strand
form, have a higher tolerance to chloride ions and hence can provide a means to extend the service life. This
study scrutinized the corrosion and structural performance of three candidate high strength stainless steel
materials, XM-29, 2205 and 316 with the goal of identifying a possible solution that uses stainless steel for
prestressed concrete piles.
Laboratory studies were conducted to characterize mechanical and stress-corrosion resistance of the different
materials. Subsequently, four, 14 in square, 75 ft long prestresed instrumented piles were fabricated at a
commercial prestressing facility for future testing by FDOT. Three of the piles were made using the three
different stainless steels evaluated; the fourth was made using a low relaxation carbon steel as a control. The
study showed that it was feasible to use all three stainless steel materials for prestressing piles but 2205 was
most suited for this application.
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