The Kentucky Transportation Center (KTC) at the University of Kentucky has performed a series of research studies for the Kentucky Transportation Cabinet (KYTC) to monitor various experimental bridge painting projects and conduct investigative work focusing on new paint systems. The research study addressed in this report “Experimental Maintenance Painting On Various Bridge Projects During 1998-2000” Kentucky Highways Investigative Task No: 40 was intended to address experimental projects in fiscal years 1999 and 2000, but was extended to address certain fieldwork and KYTC inspections through December 31, 2000.

KTC/KYTC Paint Team joint efforts in late 1998 into early 1999 centered on the preparation of experimental bridge maintenance painting special notes, preliminary field testing/development of new experimental paint systems and testing of proprietary and KYTC standard specification coatings. The laboratory tests identified candidate coatings systems that were subsequently used in the KYTC experimental bridge maintenance painting projects conducted under this study. Developmental work focused on micaceous iron oxide (MIO) pigmented moisture-cure polyurethane intermediate coatings, organic zinc moisture-cure polyurethane primers and quick- curing moisture-cure polyurethane coatings (primers and top coats) for rapid deployment painting.

The objectives of experimental project monitoring were to: assess the condition of the existing paint on bridge prior to maintenance painting, monitor the project throughout completion, note problems, describe problem resolution, appraise the condition of the final product, and report observations on/conclusions about the project.

This report will begin with a summary of the coatings testing work undertaken by KTC researchers and the KYTC Paint Team. The experimental bridge maintenance painting monitoring work is presented for each bridge in the appendices. The overall results/findings of this research study are contained in the “Conclusions” section of this report.

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The contents of this report reflect the views of the authors, who are responsible for the facts and accuracy of the data presented herein. The contents do not necessarily reflect the official views or policies of the University of Kentucky. This report does not constitute a standard, specification, or regulation.