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After 35 years or longer in service, the concrete infrastructure in wastewater collection systems and treatment plants has deteriorated due to various corrosion and physical degradation mechanisms. This paper reviews the major mechanisms that cause deterioration of concrete and protective coatings. Also, examples of infrastructure degradation are presented along with a discussion of the best diagnostic methods for condition assessment of concrete for the various mechanisms.
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In all nuclear power generating countries, high-activity, long-lived radioactive waste is an unavoidable by-product of the contribution of this energy to the global electricity generation. Disposal in deep, stable geological formations is, at present, the most promising option accepted at an international level for the long-term management of these wastes. Geological disposal relies on a combination of engineered (man-made) barriers and a natural barrier (the host rock), in order to prevent radionuclides and other contaminants ever reaching concentrations outside the container at which they could present an unacceptable risk for people and the environment.
The Hanford site contains approximately 55 million gallons (2.08 x 108 liters) of radioactive and chemically hazardous wastes arising from weapons production, beginning with World War II and continuing through he Cold War era. The wastes are stored in 177 carbon steel underground storage tanks, of which 149 are single-shell tanks (SSTs) and the remaining are double-shell tanks (DSTs). Historically, tank failures have been associated with the SSTs
Chloride induced corrosion of steel reinforcement in concrete structural elements is a major worldwide problem [1]. Chlorides can be introduced into the concrete via de-icing salts, seawater, high salinity groundwater or sabkha soils [1.2]. This leads to localised breakdown of the normally passive steel reinforcement in the form of pitting corrosion [2].
To encourage bridge owners to implement a well-planned effort to control corrosion rather than perform necessary repairs after a structure has suffered critical damage and cannot be ignored any longer. 2011r
The benefits of concrete floor polishing include creation of a durable finish with modest maintenance requirements and compliance with principals of green construction. At the same time, however, there must be rigorous adherence to proper procedures in the creation of a concrete polished finish. The presentation describes the benefits of polished concrete and explains what can go wrong and why it sometimes happens.
In certain protective coating applications, it is vital to test the finished system for flaws and pinholes, as these defects can lead to premature coating failure in service. This is particularly important when the coating is used in an immersion or partial immersion situation such as for tank or pipe linings.
Over the last 30 years clear coatings and sealers have gone from a secondary supporting role in the decorative concrete industry to a primary role with an established and defined market presence. This paper will discuss the history of clear coatings and sealers as they have evolved to meet the rapidly changing demands of the decorative concrete industry.
CLTWater is one of the largest water entities in the Southeast region, managing a total of ten water and wastewater treatment plants serving a population of approximately one million. The MCWWMF is the largest wastewater treatment plant of five wastewater facilities owned and operated by CLTWater, rated at a 64 MGD treatment capacity and accounting for over half of CLTWater’s wastewater treatment system.
HISTORICAL DOCUMENT. Design, materials, and installation procedures that to attain long-term service from a variety of polymer flooring systems. For manufacturers, specifiers, applicators, and facility owners who specify protective polymer flooring systems for concrete.
The life-cycle of concrete structures used in waste water systems should consider all factors that might cause a structural system to perform unacceptably at any point during its lifetime. This includes the progressive and sustained loss of load capacity caused by operational or environmental factors. In general terms, deterioration can be defined as a loss of structural load capacity with time as a result of the action of external agents causing chemical attacks or material weakening due to these environmental interactions.
This paper will address the new requirements of the 2012 International Energy Conservation Code for the building envelope, which requires careful design to limit uncontrolled air leakage into and out of buildings.