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Corrosion on steel bridges has long been recognized as a major concern. Over the years, technology has advanced from lead-based paints used for a century to three-coat systems. Recently, two-coat systems have been developed and are gaining acceptance. Research which is now underway to develop a one-coat system is described in this paper, along with the results of the Phase 1 testing which has been completed.
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The goal of this presentation is to help contractors and applicators first identify the problem, understand its cause, and make an informed decision on whether to complete the surface application or to seek a professional opinion in regard to the preferred repair method.
Coating and Lining of Concrete requires an understanding of both new and existing concrete substrate conditions. New concrete must be evaluated for surface strength, cracking, and construction defects. In addition, existing concrete must be evaluated for mechanical damage, chemical contamination, and corrosion. Evaluation methods and equipment will be discussed.
This paper documents the removal of floor coatings from concrete surfaces utilizing UHP water jet tools. Traditional methods, including shot blasting and grinding, meet the required production rates, but may fail to remove all of the invisible contaminants. They can also introduce dust into the environment.
This article describes the development of a web-based “fact sheet” on radiation control for commercial low-slope roofing systems. This fact sheet includes an estimating tool or “calculator” to predict the heating and cooling loads per unit area of low-slope roof. The user of the “calculator” specifies surface radiation properties (solar reflectance and infrared emittance), insulation level, and location for the roof.
This presentation will outline the results and conclusions of a number of years of testing and experience in surface preparation for high-performance coatings. Testing has shown that there are several important variables that are not routinely monitored and controlled on most coating projects. The pertinent variables will be identified, and guidance will be provided on appropriate treatment of the variables to achieve the maximum results from the chosen coating.
This paper examines the effect that curing temperature has on the physical characteristics and performance of standard cure polyamide epoxies as compared low temperature cure epoxies.
Many modern electronic gauges have the capability for transmitting or uploading data to a computer via a data port. This can mean transferring the data to a spreadsheet for customized analysis or to a data management software package for analysis using standard statistical methods. This paper describes the format of the data for a range of gauges used for the coating inspection process including surface profile determination, climatic condition monitoring and coating thickness measurement.
Significant quality control/quality assurance data is collected during industrial coating projects. Too often this data is surveyed for compliance with the contract requirements and then relegated to a file cabinet, never to be seen again. The paper highlights the types of coating inspection data collected and various “value-added” analyses which may be performed.
The hot-dip galvanizing on steel components is a very reactive material that is often given a surface treatment to inhibit oxidation from exposure to moisture and other constituents in the atmosphere. These treatments are referred to as “passivation treatments” and are applied to the zinc surfaces during the quenching process or soon after and before the surfaces begin to oxidize.
Since ductile iron (DI) pipes generally cannot be galvanized, inorganic zinc (IOZ) coatings can be considered to provide sacrificial corrosion protection in harsh atmospheric exposures, such as marine environments. The unique application of IOZ coating system provides an excellent cost-effective, long-term protection of atmospherically exposed DI pipes.
During FY2003, a feasibility study evaluated the condition of coatings on a crude oil loading berth, analyzed the ramifications of coating failure, and performed life cycle economic comparisons of maintenance coating alternatives. The subject paper presents a summary of the coating inspection results as well as an alternative method to determine the effect of coating failure and corrosion on marine loading berths.