Experimental Investigation of the Effects of Embedded Rebar, Cracks, Chloride Ingress and Corrosion on Electrical Resistivity Measurements of Reinforced Concrete Public Deposited

http://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/1544br670

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  • The effects of steel reinforcement, chloride-induced corrosion initiation, cracking and delamination 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, (6) corrosion of rebar, (7) crack and delamination properties, (8) probe configurations with respect to a crack, and (9) moisture content of concrete. 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. Conductive cracks had no significant effect or under-measured electrical resistivity and insulative cracks either over-measured or under-measured electrical resistivity. However, surficial microcracking had no significant effect on electrical resistivity measurements. Delamination of the concrete cover was detected by electrical resistivity measurements for small concrete cover thicknesses. 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 suggested.
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