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Corrosion Performance Testing in Accordance with AASHTO MP 18M/MP 18-09

Laboratory Evaluation of Corrosion Performance—MMFX 2 (ASASHTO MP18/ASTM A1035-Grade 100) concrete reinforcing bars

To evaluate the corrosion performance of MMFX 2 (AASHTO MP18/ASTM A1035-Grade 100) concrete reinforcing bars according to the requirements of AASHTO Standard Specification: MP 18M/MP 18-09—Uncoated, Corrosion-Resistant, Deformed and Plain Alloy, Billet-Steel Bars for Concrete Reinforcement and Dowels.

The scope of the work was to evaluate the corrosion performance of MMFX 2 reinforcing bars using laboratory electrochemical corrosion tests. Specific tests were polarization resistance and potentiodynamic polarization tests on No. 3 through No. 11 (10-36 mm) bars of MMFX 2, using a No. 4 (13 mm) ASTM A 615, Grade 60 bar for comparison.

In addition, micrographs of etched specimens were taken as an index for confirmation of the microstructure for each of the test bars.

The results show that MMFX 2 meets the requirements of AASHTO Standard Specification: MP 18M/MP 18-09—Uncoated, Corrosion-Resistant, Deformed and Plain Alloy, Billet-Steel Bars for Concrete Reinforcement and Dowels.