Session: Corrosion of Reinforced Concrete Structures: Coatings and Concrete
Characterization of various corrosion resistant rebars embedded in concrete after 20 years of exposure (C2026-00081)
Thursday, March 19, 2026
8:30 AM - 9:00 AM Central
Location: 371 DE
Earn .5 PDH
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Simulated deck slab samples cast with six rebar, three in the top row and three on the second row are being monitored after 19 years. The rebars are different corrosion resistant reinforcement: 2304, 304, 316, two clad rebars (316 with carbon steel core) and an alloy with 12% Cr. The samples were exposed outdoors to 15% NaCl by wt% for at least 10 years (wet and dry cycles). The concrete cover over the first row in most samples was one inch. A variety of geometry and rebar surface preparation took place. Rebar potential and electrochemical methos were used to characterize current conditions. Most rebars appear not to be corroding. A couple of samples show cracks on the concrete surface due to corrosion, the samples contain clad rebar in which holes were drilled every 2.5 cm along the rebar length. Samples with 12% Cr also show corrosion signs, in this case an artificial crack reduced the concrete cover. There are a few other samples with rebars that appear to be corroding based on corrosion rates and have no cracks. The rebars in these samples were either pickled or wired brush with a carbon steel metal brush (this likely cause small crevice).
