Stainless Steel Prestressing Strands and Bars for Use in Prestressed Concrete Girders and Slabs

Stainless steel alloys such as 2205 and 2304 show promise for use to address the corrosion deterioration of steel in prestressed concrete girders and slabs given their inherent properties. The expectation is that the stainless steel will provide durable corrosion protection and prevention of premature spalling or corrosion-induced cracking. Results from past studies will be investigated and examined to determine the feasibility and accessibility of these materials to be considered for use in prestressed concrete girders and slabs. The research team will identify stainless steel manufacturers (in concert with SHA OMT and Office of Structures, Bridge Design Division) to verify the material properties and other facts about the material to determine its feasibility and accessibility. The information will also be documented in a web-generated survey conducted by Morgan State University (MSU) (using SurveyMonkey, for example) for which manufacturers will also be asked to complete to document information and ascertain their experiences. Other materials that may achieve similar results and be more advantageous to use such as carbon fiber strands or even aramid fiber reinforced polymer bars (AFRPs), which have been used by this project's Principal Investigator in previous research. A life-cycle cost analysis will be conducted to determine the long-term advantage of stainless steel compared to conventional prestressing steel and alternate materials when compared to the future maintenance and/or repair costs, thereby providing a life-cycle cost (LCC) analysis. Some studies have shown that stainless steel rebar is ductile, has the capability of 3 times its diameter for bends, and can be welded together for the commonly used grades. Reported challenges of some potential "hazards" while welding stainless steel will also be noted and tested, where appropriate. Moreover, stainless steel does not need to be coated or covered. This information along with more information on costs/lb will be determined to complete the life-cycle cost analysis, and be of benefit to state highway administration (SHA )as to how to proceed for the future.