Improved corrosion inspection procedures for reinforced concrete bridges : electrical resistivity of concrete.

Morales, Monica; Isgor, O. Burkan

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Improved corrosion inspection procedures for reinforced concrete bridges : electrical resistivity of concrete.

2015-07-01
By Morales, Monica ; Isgor, O. Burkan

File Language:

English

Details

Creators:

Morales, Monica ; Isgor, O. Burkan
Corporate Creators:

Oregon State University
Corporate Contributors:

United States. Dept. of Transportation. Research and Innovative Technology Administration
Subject/TRT Terms:
Resource Type:

Tech Report
Geographical Coverage:

United States
Corporate Publisher:

Pacific Northwest Transportation Consortium
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.
Format:

PDF
Funding:

DTRT12-G-UTC10
Download URL:

https://rosap.ntl.bts.gov/view/dot/29417/dot_29417_DS1.pdf
File Type:

[PDF - 1.84 MB]
Collection(s):

University Transportation Centers ; US Transportation Collection
Main Document Checksum:

urn:sha256:6cacbb7cf27f0642b2d95d94bd61533b6ca125c122cce085a53ffca2285a3bb8

File Language:

English

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