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Attendees will be provided an overview and understanding of the problems associated with concrete deterioration in water and wastewater treatment facilities. Information regarding surface preparation, material selection and application methods will be presented.
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Failure of flooring materials is usually due to a combination of factors rather than a single, simple cause that led to below expectation performance. For example, construction on a less than high quality concrete slab on grade, combined with the absence of a vapor retarder, with residual concrete wear and contamination, followed by inadequate surface preparation, and finally poor coating selection applied during inclement ambient conditions that is turned over early to severe service is a recipe for disaster.
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.
The purpose of this work is to study the impact of the quality of steel surface preparation and the level of soluble salt contamination on the performance and durability of protective coating systems.
A steel surface has been properly prepared to a white metal blast and it looks great … to the naked eye at least. But is it? Why is a surface that has the correct profile and appears to be perfectly clean typically not good enough? A standard abrasive blast will give you the profile and visible cleanliness, but how clean is it? Testing is the only way to determine. That is testing for conductivity, chlorides, and any other contaminants.
Coating standards specify the required surface conditions needed prior to coating. A maximum amount of soluble salts of 20 mg/m2 is widely adopted as acceptation criteria, according to standard NORSOK M-5011. However, meeting these requirements for thermal spray aluminium coatings (TSA) in offshore environments is challenging due to the ubiquitous nature of water-soluble salts.
Selection of coatings for concrete surfaces in nonimmersion and atmospheric services. Chemical properties. Surface preparation. Service conditions. General properties. Testing. Historical Document 1991