In this work two concrete formulations, one made with ordinary portland cement and the other with pozzolanic portland cement, are compared from rebar corrosion point of view. Both formulations are candidates for nuclear applications whose durability requirement is higher than 300 years. A monitoring of approximately four years and six months of monitoring was carried out on the following parameters: corrosion potential and corrosion rate of the reinforcements, electrical resistivity, oxygen flow and internal temperature of concrete. These parameters were measured in reinforced concrete specimens by embedded sensors. The presence of reinforcements provides the possibility of monitoring directly on them the corrosion potential, the corrosion rate and electrical resistivity of concrete, using a commercial instrument widely used in the work reported in the literature.

The results showed corrosion potential values in passive state while the corrosion rate is decreasing in the low range. Consistently, the oxygen availability is decreasing and the electrical resistivity increasing with time evolution.

Subject
Sensors, Materials, Corrosion rate, Rebar, Corrosion evolution, Instrumentation, Meshes, Electrical resistivity, Oxygen, Reinforced concrete, Electrodes, Corrosion potential, Concrete
Keywords:
Reinforced concrete corrosion, durability of reinforced concrete, nuclear materials
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2017
Association for Materials Protection and Performance (AMPP)
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