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Title: REMR Management SystemsC : coatings for use on wet or damp steel surfaces
Authors: Repair, Evaluation, Maintenance, and Rehabilitation Research Program (U.S.)
Beitelman, Alfred D.
Keywords: REMR Management System
Steel structures
Publisher: Construction Engineering Research Laboratory (U.S)
Engineer Research and Development Center (U.S.)
Description: Abstract: The Corps of Engineers is responsible for maintaining many steel structures that are under conditions of constant condensation. Many of these structures are located inside locks and dams. Examples include gates, reservoir outlets and their gate recesses, piping systems inside dams, and valves on locks that are difficult to remove from their recesses. These surfaces can normally be blast-cleaned to a white metal grade, but the condensation and/or spray of water from leaking seals causes the surface to immediately become too wet for the application of many coatings. Recent developments in the coatings industry have produced coatings that are advertised to be capable of providing acceptable adhesion to damp and wet steel and to provide a high level of corrosion protection. There are several mechanisms by which these coatings adhere to the substrate: two-component epoxies can be formulated to displace the water from the surface; moisture-cure urethanes can use small amounts of moisture on a surface to chemically cure the coating; and waterborne vinyl acrylics are available that can be applied to a damp surface and form a coating with low moisture permeability. However, no comparative studies of these products are known to exist. The objective of this work was to evaluate proprietary coatings developed and marketed for application to damp or wet steel surfaces and develop a performance specification for civil works applications. This research was conducted in three phases. During Phase I a number of proprietary coatings were obtained and tested to determine test methods that would properly simulate the conditions experienced in the field. Phase II evaluated a larger number of coatings using the most suitable test methods identified. In Phase III, the most promising coatings were applied to field structures in order to validate the laboratory test results. Based on the findings of this work test methods were modified and a draft Commercial Item Description (CID) was prepared. Five materials were tested according to the draft CID, and 3 were found to meet all of the requirements and were included in the CID as potential sources of supply. The CID is attached at Appendix A. The manufacturers supplying products for this study are listed in Appendix B.
Rights: Approved for public release; distribution is unlimited.
Appears in Collections:Technical Report

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