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Adit towers are generally vertical, large diameter concrete pipes that serve as vaults for valves used to drain and fill a reservoir. The tower runs from several feet above the waterline down through the reservoir and into the reservoir bed for some distance. Many of these towers and reservoirs are old and deteriorating, as the United States suffers from an aged infrastructure.
Adit towers are generally vertical, large diameter concrete pipes that serve as vaults for valves used to drain and fill a reservoir. The tower runs from several feet above the waterline down through the reservoir and into the reservoir bed for some distance. Many of these towers and reservoirs are old and deteriorating, as the United States suffers from an aged infrastructure. External cracking is common above the waterline; weeping and leaking cracks are often present on the interior, and the valves, piping and infrastructure (stairways, pipe supports and structural steel) are often corroded. This paper describes the process (assessment, testing and construction) used to rehabilitate a decades old tower that was experiencing all of the problems identified above. The paper discusses the procedures that were performed to (1) repair cracks in the exterior walls above the waterline, (2) stop leaking cracks on the interior walls below the waterline, (3) line the interior walls with a moisture vapor resistant epoxy and (4) coat the interior steel surfaces.
Desiccant dehumidification technology has transformed itself into a sophisticated and mainstream method that is used in many blasting and coating applications today. Utilizing temporary dehumidification and remote monitoring equipment for a blast and coating operation for the Onslow Beach Bridge allowed the project to be completed in 30 days – twice as fast as is typical for the type of project. This paper also will discuss how a contractor realized significant fuel savings due to the use of energy-efficient equipment.
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Self-healing polymers are a new class of smart materials, which have the capability to autonomically repair themselves after damage, without the need for detection or repair by manual intervention. To expand the scope of practical applications, new self-healing chemistries have been developed and evaluated for use in a wide variety of applications including coatings.
Polyurethane technologies have demonstrated their applications in a variety of seamless polymer flooring systems. Aliphatic polyurethanes are widely used as topcoats since they provide combinations of good color stability, gloss retention, abrasion resistance, chemical resistance, and weathering resistance. Recent development in polyaspartic chemistry offers more options in coating thickness, curing temperatures, and solids content.