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Corrosion Tests of XM28 Stainless Steel Reinforcing Bars
Farshadfar, Omid Keith, Christine O’Reilly, Matthew Darwin, David
Farshadfar, Omid
Keith, Christine
O’Reilly, Matthew
Darwin, David
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Abstract
The corrosion resistance of XM28 (EnduraMet® 32) stainless steel reinforcing bars produced by Talley Metals was evaluated using the rapid macrocell and cracked beam tests outlined in Annex A3 of ASTM A955. In addition, the Southern Exposure test was used to determine critical chloride corrosion threshold (CCCT). Six specimens were tested for the rapid macrocell test; neither individual corrosion rates nor average corrosion rate of those exceeded the limits set in ASTM A955 (0.5 μm/yr and 0.25 μm/yr, respectively). Six specimens were cast for each cracked beam and Southern Exposure tests. The bars did not initiate corrosion in the Southern Exposure test, precluding the determination of an exact chloride threshold. It can be concluded that the CCCT of the bars exceeds the end-of-life chloride content of the concrete, 9.35 lb/yd3 (5.55 kg/m3). For the cracked beam test, individual corrosion rates of four out of the six specimens were greater than 0.5 μm/yr for the majority of the test duration. In addition, the average corrosion rate for the cracked beam specimens exceeded 0.2 µm/yr at week 30 and every week thereafter. The bars in the cracked beam test showed visible corrosion after the autopsy of the cracked beam specimens at the end of the test, supporting the corrosion rate measurements. Thus, the XM-28 stainless steel satisfied the requirements of ASTM A955 in the rapid macrocell test but failed in the cracked beam test.
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Date
2016-08
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University of Kansas Center for Research, Inc.
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Keywords
Chlorides, Concrete, Corrosion, Reinforcing steel, Stainless steel
Citation
Farshadfar, O., Keith C. A., O’Reilly, M., Darwin, D. "Corrosion Tests of XM28 Stainless Steel Reinforcing Bars," SL Report No. 16-3, The University of Kansas Center for Research, Inc., Lawrence, KS, August 2016, 34 pp.