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标准 推荐习惯做法 钢板和混凝土上衬里的检查 Application of metallic thermal spray coating (TSC) of aluminum, zinc, and their alloys and composites for the corrosion protection of steel.
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This standard contains requirements for steel panels used to perform tests for evaluation of various performance characteristics of protective coatings applied to steel substrates. Panels meeting requirements of this standard may be used for tests including, but not limited to, natural and accelerated exposure in or out of the laboratory; tests to determine resistance to various chemicals, impact, and abrasion; and tests to characterize properties such as color, gloss, adhesion, and hardness. Requirements for steel composition, panel dimensions, surface preparation, ambient conditions for application and cure of coatings, and location and dimensions of scribes on coated panels are included.
Surface Applied Corrosion Inhibitors (SACI) remain controversial as to effectiveness and the ability to compare materials from different manufacturers and technologies. These materials are liquids applied to the surface of concrete to control the corrosion of embedded reinforcing steel. This presentation will discuss the performance and relative importance of a recent testing program for corrosion inhibition and other performance parameters using documented test methods.
Steel surfaces are frequently cleaned by abrasive impact prior to the application of protective coatings. The resultant surface profile, sometimes called an anchor pattern, is comprised of a complex pattern of peaks and valleys, which must be accurately assessed to ensure compliance with job or contract specifications.
Asbestos containing textured coatings and other various asbestos containing components are not often thought of as being used on bridges. However, their use on bridges, especially concrete bridges is widespread in some regions and because of this, specific regulatory compliance is required. Knowing how to comply and how proper abatement is performed will keep the contractors and facility owners in compliance, avoid associated liabilities, provide proper employee safety and keep bridge maintenance projects on schedule.
Framatome identified a need to reduce radioactive contaminants on plant equipment and vendor supplied tooling, through the use of hydrophobic coatings, as a potential cost savings within the Nuclear Industry.
The Use of sacrificial anode cathodic protection has successfully prevented the corrosion of both new and old corroding prestressed non-cylinder concrete pipelines. Field results from 5 new and 3 old lines, which have been cathodically protected for up to 18 years, are reported. In all cases the required potential difference criteria. have been achieved with current densities in the range 0.2 to 1.8 mA per square metre of steel surface area.
After 35 years or longer in service, the concrete infrastructure in wastewater collection systems and treatment plants has deteriorated due to various corrosion and physical degradation mechanisms. This paper reviews the major mechanisms that cause deterioration of concrete and protective coatings. Also, examples of infrastructure degradation are presented along with a discussion of the best diagnostic methods for condition assessment of concrete for the various mechanisms.