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Several coating systems and designs were chosen to protect a concrete chamber with side walls coated with a polyvinylidene fluoride (PVDF) material. When polyurea was identified as the coating to be used at this engineering pilot plant, which contains harsh caustic chemicals in conjunction with PVDF coated panel walls; an extensive research was conducted to determine which method will be utilized to create a seamless protective film between these two systems.
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A method of using spray polyurea coatings and woven aramid, fiber wet-out with a proprietary material to form a composite. The composite is built in place and used to retrofit structures and vehicles to resist the effects of explosive blasts.
The use of polyurea-based thick film coating materials for substrate protection and corrosion prevention has taken an exponential rise in the marketplace in the past 10 years or so. When properly installed, polyurea coatings offer a variety of performance characteristics.
In the early 1900’s, a small community in the mountains of western Maryland, installed two potable water tanks that were open top and below grade. Over the years, they began leaking water into the basements of nearby residences, so several upgrades to the tanks were planned. The upgrades included the addition of metal dome roofs, electronic security systems with fencing, and a waterproof lining system. Contractors were invited to view the facility and bid the lining system while the tanks were still in service – first mistake
Application of conventional coatings directly to concrete tanks is a common practice for the primary containment of liquids. Substituting the application of polyurea geomembranes in lieu of conventional methods exhibits a significant reduction in application time with regard to certain surface rehabilitation, surface preparation, and priming of substrates. Polyurea geomembranes are high performance liners designed for various reasons that include, but are not limited to, protection of the environment from pollution and hazardous materials or protection of the lining’s contents from vessel contamination.
Although polyurea geomembranes have been successfully used in the market for several years, technical information and performance evaluations are virtually nonexistent. Furthermore, when referring to construction specifications for polyurea geomembranes, physical properties of the coating and geotextile are listed rather than those of the geomembrane. Polyurea geomembranes have unique properties, and they deserve the same comprehensive testing and reporting as the components used to form them.
This paper presented the polyurea protective project of Beijing-Shanghai High Speed Railway. It also reviewed the polyurea history in China, introduced research and development of polyurea in Qingdao Technological University. The analysis and discussion on the application problems exposed in the Beijing-Shanghai High Speed Railway project were performed in this paper.
For years, people have relied upon a variety of industry accelerated testing methods in order to predict how long a coating / lining system may be useful in service. This type of testing would include heat aging, Atlas Cell immersion testing for lining products and accelerated weatherometer testing for coating systems, just to name a few. Polyurea spray applied elastomeric materials have been no exception to this type of testing. One of the most important testing evaluations has been accelerated weatherometer exposure for products used in outdoor application areas.
The paper will outline the following: 1. Process from when a customer approaches the polyurea supplier with a set of problems they need to overcome and the important issue of understanding what the customer and the job requirements really are. 2. How to evaluate and determine if the products you have available are suitable or not. 3. The process of having the customer write specifications based on what the applicator can realistically deliver and accomplish.
Polyurethane coating systems on parking structures are designed to prevent leaks, protect the concrete from deterioration, and prevent corrosion in the reinforcing steel
The Occupational Safety and Health Act of 1970 (OSH Act) was passed to protect workers from death or serious harm and requires employers to provide their employees with working conditions that are free of known dangers. The Act created the Occupational Safety and Health Administration (OSHA), which sets and enforces protective workplace safety and health standards.