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High performance concrete coatings are frequently applied with a grade of texture to improve traction and safety. The finished texture is dependent upon the size and type of aggregate, application method and density, and the amount of topcoat applied over the texture. Defining the degree of texture within a specification and translating the description to installation has typically been left to individual interpretations.
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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.
This paper will discuss the relationship between corrosion and hazardous locations and how to achieve the overall best performance and safety of your conduit system. What makes an area corrosive often makes it hazardous, in fact the elements that are necessary for either corrosion or an explosion are very similar.
As part of the national research project OWS-MV (Offshore Wind Solutions-MecklenburgVorpommern), investigations were carried out to assess effects of mechanical stresses on the corrosion protection performance of coatings for offshore wind turbines (OWEA). In order to simulate typical damage mechanisms during transport and assembly of OWEA, compression, impact and abrasion tests and corrosion resistance tests were performed on laboratory scales.
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.
Utility scale solar array construction projects continue to grow in number annually. Large open spaces with consistent UV exposure often make excellent locations for solar array fields, however these sites do not always provide ideal soil conditions for the steel H beam pile supports which are embedded into the ground.
Using dehumidification in shipyards has been a widely accepted practice for three decades. A lot has been learned and techniques have become much more sophisticated but the basic goal of preserving the blasted steel and creating the right conditions for coatings application remains the same. This paper discusses how various combinations of desiccant dehumidification, heating and cooling equipment have been utilized properly and some examples of when things did not work out so well.
PA2 was initially developed when the only instruments available were the Banana gauge and basic analogue and digital DFT gauges. Gauges now have memory, limits and scanning technology amongst other features. Scanning technology in DFT measurement has been available for some time now, but only recently has work begun on the standards to incorporate this technology.
Many times, concrete coating projects are approached similarly to those of other paintable substrates, like steel or wood. The primary and sometimes only, focus is to provide a visibly clean and sound surface. More experienced design professionals will ensure that voids are filled, protrusions are ground to plane, and the correct surface profile is achieved. Once prepared, a serviceable coating system is applied (always as per the manufacturer’s recommendations) and no one looks back… unless there is a failure.
Coating thickness is one of the most important parameters influencing durability of a protective coating system. As a general rule-of-thumb, the thicker the coating, the greater the protection. But is there any upper limit to this general rule? This paper looks at durability figures of common protective coating systems for atmospheric and immersion exposure as a function of dry film thickness.
The objective of surface preparation is to create proper adhesion of a coating over the substrate. Proper surface preparation is vital to the long life and effectiveness of a coating applied in corrosive service. In some projects, the owners ask for the additional water jet cleaning prior to blasting work.
Feathering is the process of tapering or blending-in an existing intact coating in preparation of applying a new repair coating. This industry common practice is intended to ensure good adhesion of the repair coating to the legacy coating, and to provide a seamless aesthetic transition for areas where maintenance painting is performed. There are no industry standard requirements for performing feathering, resulting in most specifications having their own unique definition.