United States Department of Transportation
i
Improved corrosion inspection procedures for reinforced concrete bridges : electrical resistivity of concrete.
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2015-07-01
[PDF-1.84 MB]
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Abstract:The effects of steel reinforcement and chloride-induced corrosion initiation on the electrical resistivity measurements using the Wenner
probe technique were studied experimentally on custom-designed reinforced concrete slabs. Investigation parameters included (1) probe
configurations with respect to rebar mesh, (2) rebar density, (3) epoxy coating on the rebar, (4) concrete cover thickness over embedded
reinforcement, (5) chloride ingress, and (6) corrosion of rebar. The concrete moisture condition and cover thickness influenced the effect
of rebar mesh. It was theorized that bound chlorides increased electrical resistivity measurements and counteracted the effect of free
chlorides. It was observed that epoxy coated rebar did not significantly affect measurements. Uncoated rebar affected resistivity
measurements, particularly for saturated and semi-saturated concrete. Corrosion initiation was observed to have no significant effect on
measurements. Larger concrete cover thicknesses provided for more discrepancy between half-cell potential and electrical resistivity
measurements. Recommendations to increase electrical resistivity measurement accuracy on reinforced concrete slab surfaces are made.
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