08313 Corrosion Resistance of Alternative Reinforcing Bars: An Accelerated Test

Available for download

Product Number: 51300-08313-SG

ISBN: 08313 2008 CP

Author: Fushuang Cui, Paul D. Krauss, and Scott Humphreys

Publication Date: 2008

Member Price: $0.00

Non Member Price: $20.00

Price: $20.00

Qty:

Various types of solid and coated reinforcing bars, including stainless steel types 316LN, 2205, 2201 and 3Cr12; a proprietary low-carbon, chromium alloy (ASTM A1035); epoxycoated both recently produced and 15-year old bars extracted from a northern bridge deck; and zinc-coated (galvanized), were simultaneously exposed to 5 % NaCl solution at 35oC in a salt-spray (fog) apparatus (ASTM B 117) for up to 4 weeks. Conventional carbon steel reinforcing bars were included as a control. The bar condition was visually inspected periodically and weight loss analyses were performed at 1, 2 and 4 weeks. Based on weight loss data, the corrosion resistance of the solid bars was ranked as follows: 316LN and 2205 > 2201 > 3Cr12 and A 1035 > carbon steel. Galvanized bars showed some delay in corrosion of the underlying steel, however, the zinc coating was quickly consumed and the average corrosion rate was comparable to that of carbon steel bars. In contrast, corrosion on all the epoxy-coated bars occurred only at defects and the average weight loss was nearly zero. The relative corrosion resistance ranking of the tested bars is consistent with the results reported in literature from more intensive testing regimes. Therefore, this highly accelerated test program provided a simple, quick, and useful comparison of the corrosion resistance of the tested steel reinforcement.