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This paper presents case histories on two commercial projects that incorporated industrial surface preparation, application and quality control standards and procedures into the work plans to achieve successful results. Highlights of SSPC audits for QP-8 and QP-9 recertification on the projects will also be discussed.
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Liquid-applied protective linings are commonly used to protect concrete structures found within water and wastewater treatment facilities. There are a number of referenced industry standards and guidelines detailing the construction of new concrete, evaluation of existing concrete, and surface preparation of concrete. This paper provides recommendations based on industry standards and related publications, as well as drawn from practical experience for preparing concrete for immersion conditions or chemical containment service in water and wastewater treatment.
In many instances, concrete needs to be repaired and waterproofed prior to coating. General practices apply across many different market segments. Vertical, horizontal and overhead repair scenarios have many things in common and a variety of repair products to consider depending on jobsite conditions, time frame and ultimate exposure of the repair materials (chemicals, weather, movement, etc.). The purpose of this paper will be to outline, in general terms, different types of repair scenarios that have a proven track record and are available for owners, engineers/architects, and contractors to utilize.
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.
Successful repair material and coating applications are dependent on proper concrete surface preparation. Different surface preparation technologies and quality control methods are reviewed to increase the successful application of materials applied to existing concrete surfaces.
Successful repair material and coating applications are dependent on proper concrete surface preparation where different technologies and methods must be reviewed and characterized, as well as quality control methods used to increase the successful application of materials applied to existing concrete surfaces.
There are many factors which need to be considered when making the decision to over coat an existing coating system. With the magnitude of data that need to be evaluated in relation to the existing coating system and potential scenarios that are possible it is important to take multiple details into account. Details including inspection criteria of the existing coating system and substrate, owner’s goals and objectives, asset location and environmental conditions must all be taken into consideration.
Coatings are widely used for highway steel bridges exposed to aggressive environments to extend their service life. Even with the continuous development of coating technologies, steel bridges remain susceptible to corrosion deterioration. Periodic maintenance, that may include coating repair, is required for long term bridge serviceability. Selection of compatible repair coating materials and appropriate preparation of the steel surface are critical parameters for corrosion protection.
An important segment of the high-performance protective coatings market is weatherable, direct-to-metal coatings. Coatings that weather well and provide corrosion protection are recommended for direct-to-metal applications, due to the dual benefits of ease of application and good asset protection. However, performance can vary widely based on the coating type and substrate preparation, with performance often rated by accelerated corrosion testing.
Pond investigated pressure vessel tank failures which are causing recurring maintenance of $250,000 per year. This challenging project had limitations of space, operational time pressures/vessel availability requirements, cost and replacement variables. This presentation will chronical problems and discuss best practices of specifications, material selection, surface preparation, and application inspection that would have prevented the aforementioned outcome. This paper discusses the fundamentals of composite coatings, industry accepted design standards for their use, and examples of typical uses for these materials that solve problems in varied industries.
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.
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.