Between 1937 and 1941, a five-mile long pier was constructed in Progreso, Mexico. This pier is believed to be the oldest concrete structure reinforced with solid stainless steel reinforcement (rebar). Stainless steel reinforcing bars can be used where extreme corrosion resistance is necessary or where non-magnetic characteristics are needed (e.g. MRI chambers). Stainless steel bars are most frequently used where the conditions are unusually corrosive, where extended service life is necessary or where the cost due to a disruption in service is high.
The ASTM specification for solid stainless steel reinforcing bars is ASTM A955/ A955M, Standard Specification for Deformed and Plain Stainless Steel Bars for Concrete Reinforcement. This specification is applicable to a wide range of stainless steel alloys, including 304 (UNS S30400), 316LN (UNS 31653), 2205 Duplex (UNS 31803), and XM- 28/N32 (UNS 24100). ASTM A955 requires that the surface of the bars be free from detrimental imperfections, seams, surface irregularities, and the like are acceptable so long as tensile and bending requirements are met.
This document is intended to provide guidance to design professionals, field personnel and state DOTs regarding the use of stainless steel reinforcing bars and stems from the many inquiries that we receive with questions on the topic.
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