Webinar: Corrosion Propagation of Carbon Steel Rebars in Concrete

All webinars are Pacific Time

Webinar Title

Corrosion Propagation of Carbon Steel Rebars in Concrete

Speaker

Francisco Presuel-Moreno, Professor and Director of Graduate Programs, Florida Atlantic University Department of Ocean and Mechanical Engineering

Webinar Abstract

There have been reports that suggest that the rebar corrosion rate (once corrosion has initiated) is lower on concrete with higher resistivity (i.e., containing supplementary cementitious materials). This in part might be due to a smaller macrocell and smaller throwing power. However, it is not clear if the resistivity (or solution resistance) changes as corrosion progresses. Specimens with binary and ternary concrete mixtures were prepared in 2016. Single rebar specimens were reinforced with a #3 rebar and have 0.75 cm concrete cover; other specimens were prepared with three #4 rebars with a 1.25 cm concrete cover. Electromigration was used to accelerate chloride transport, and corrosion typically initiated after a few weeks, but in a few cases, it took a few months. The effect of rebar length under the reservoir and concrete composition was investigated. This webinar presents monitoring of these samples during the corrosion propagation stage. Galvanostatic pulse was used to determine the corrosion current. The corrosion current, solution resistance and rebar potential have been monitored for over 1500 days. The webinar will also include analysis of the corrosion extent found on rebars from samples terminated after 24 years of exposure outdoors and with the samples subjected to wet/dry cycles with seawater.

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