11010 Cathodic Behavior of ~9% Cr Steel Reinforcement in Concrete

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Product Number: 51300-11010-SG

ISBN: 11010 2011 CP

Author: Mersedeh Akhoondan and Alberto Sagues

Publication Date: 2011

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The extent of the oxygen reduction reaction in concrete was evaluated for ~9% Cr rebar approaching the ASTM A1035 specification and compared to that of conventional carbon steel rebar, at ages of up to ~ 1year. Cathodic strength was measured by the cathodic current density developed at -0.35 and -0.40 V (Cu/CuSO4) in cyclic cathodic potentiodynamic polarization tests, both in the as-received condition with mill scale, and with scale removed by glass bead surface blasting. In both conditions the ~9% Cr alloy was a substantially weaker cathode, by a factor of several fold, than carbon steel. Within each material, the surface blasted condition yielded also much lower cathodic current density than the as-received condition. These trends indicate an additional benefit in the application of ~9% Cr alloy as an alternative material to CS. There was strong correlation between the charge storage capability of the interface and the extent of cathodic reaction of oxygen. The result cannot be ascribed solely to differences in effective surface area between the different materials and conditions.

Key Words: 9% Cr, steel reinforcement, rebar, concrete, cathodic reaction, mill scale, glass bead blasting, corrosion