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Evaluation of Multi-Layer Polymer Concrete Overlays
Tiwari, Bijay Darwin, David O'Reilly, Matt
Tiwari, Bijay
Darwin, David
O'Reilly, Matt
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Abstract
Multilayer polymer overlays were evaluated using cracked beam and Southern Exposure specimens to investigate their ability to limit corrosion of reinforcing steel in bridge decks. Corrosion rates, corrosion potentials, and total corrosion rates based on linear polarization resistance results were used for the evaluation. Two polymers, the epoxies Sikadur and Flexolith, were used for preparing the polymer overlays. Test specimens were prepared using three systems: one layer of epoxy polymer, one layer of epoxy polymer and aggregate, and two layers of epoxy polymer and aggregate (the manufacturers’ recommended application). Specimens without polymer overlays were also tested. Some cracked beam specimens were contaminated with chloride and then coated with polymer overlay to evaluate the ability of polymer overlays to limit corrosion in chloride-contaminated concrete. The design, fabrication, and testing procedures for post-crack specimens, used to evaluate the ability of the overlays to remain intact when cracks form in the concrete after the overly has been applied, are described, but no test results are yet available. The results of the study show that specimens without the polymer overlay exhibited the highest corrosion rate. One cracked beam specimen with two layers of Sikadur polymer and aggregate, one cracked beam specimen with one layer of Flexolith polymer and aggregate, and one cracked beam specimen with two layers of Flexolith polymer and aggregate exhibited higher corrosion activity than the other specimens with polymer overlays. Other than these three specimens, little corrosion activity was observed, and overall, the results show that multilayer polymer overlays limit corrosion. In addition, a measurable reduction in corrosion rate occurred when chloride-contaminated concrete was coated with a polymer overlay.
Description
PCiRoads
Date
2025-01
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Publisher
University of Kansas Center for Research, Inc.
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SLReport_25-1.pdf
Adobe PDF, 1.78 MB
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Keywords
Chlorides, Concrete, Corrosion, Flexolith, Multi-layer polymer overlays, Sikadur
Citation
Tiwari, B., Darwin, D., and O’Reilly, M., “Evaluation of Multi-Layer Polymer Concrete Overlays,” SL Report 25-1, University of Kansas Center for Research, Inc., Lawrence, KS, January 2025, 76 pp.