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This presentation focuses on Abrasive Blasting as it is the most widely form of surface preparation in the Protective Coating Industry. It is a brief but comprehensive presentation of the top 5 mistakes made when Abrasive Blasting and how these can be resolved to lower the total cost of a surface preparation project.
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Requirements for "Industrial" - one of five levels of cleanliness of steel surfaces achieved by blast cleaning with the use of abrasives. (White Metal, Near-White Metal, Commercial, Industrial, Brush Off)
Power tool cleaning has been a common method of surface preparation prior to coating application since the dawn of steel shipbuilding. Power tools are usually handheld pneumatic, or sometimes electric, devices that through impacting or abrasive action can remove coating and corrosion. Most commonly power tool cleaning has been used for re-work or coating repair associated with outfitting. Typically, power tools are limited to the touch up or repair of small areas or areas that cannot be accessed by bulkier equipment such as abrasive blasters.
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.
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.
HISTORICAL DOCUMENT.
Corrosion is a universal challenge for metal structures. Metal, due to its natural strength, is a common choice for building materials yet sensitive to the environment it is placed in, requiring mitigating actions to ensure proper lifecycle. Coatings are utilized as the primary defense against corrosion; the type based on substrate material and environment.
Coating/lining manufacturers and/or facility owners frequently specify cleaning and roughening of the concrete surface prior to product installation. The specifications may reference qualitative methods including visual assessments using comparison coupons or quantitative methods including surface profile depth measurements. However, prior to this Technical Report, there was no known data to inform a conversion between qualitative and quantitative methods. The outcomes of this Technical Report enable coating manufacturers, engineers, specifiers, and contractors to convert well-established qualitative methods to quantitative values based on an interlaboratory experiment. While current quantitative methods can measure up to 6 mm (250 mils), extremely rough concrete surfaces (exceeding ~1.5 mm, or ~50 mils) were not included in the experiment due to the inability to stabilize the instrument probe and obtain accurate data.
Today the complaint is that there are too many standards for surface preparation by water jetting. A comparison of the NACE/SSPC, German, Navy, and proprietary standards, the areas of application, and future goals will be presented.
Now more than ever, epoxy coatings on concrete will only prove successful if diligent care is given to the details of concrete preparation. Preparation is more than grinding or facing of an existing surface and should ideally begin in the developmental stages of the structure.
The coatings industry is very familiar with shot/grit blasting as a mechanical means of surface preparation. Over the years, operators have worked with manual and automatic blast equipment with its associated dust collection arrangements. As with every manufacturing process, operating costs are very critical in this highly competitive industry. Therefore, coaters are always on the lookout for ways to tune their process and increase productivity.