Concrete protective barrier systems

It is now widely accepted that the inherent chemical resistance of concrete is limited and that the concrete surface needs additional barrier protection when exposed to aggressive environments. Unlike the metallic substrate, the concrete substrate is heterogeneous and porous in nature. Protective barrier systems protect concrete from degradation by... 

ACI (1979) A Guide to the Use of Waterproofing, Dampproofing Protective and Decorative Barrier Systems for Concrete, committee report 515 lR-79, American Concrete Institute, PO Box 9094, Farmington Hills, Detroit, MI 48333, USA. 

The PRISM containment system uses three successive barriers—fuel cladding, primary coolant boundary (reactor vessel cutaway view shown in Figure 6.4), and a containment boundary that surrounds the reactor vessel— to provide defense-in-depth from postulated releases from the reactor vessel. The function of the PRISM containment is to protect the public from any accidental release of radioactivity from the reactor. The containment consists of the containment vessel surrounding the reactor vessel and a lower contaiiunent over the reactor closure. The containment boundary is a steel-lined concrete upper structure that encloses the reactor module as shown in Figure 6.4. 

Tolerates poorly prepared surfaces and provides excellent barrier protection. A third coat may be added for additional protection. Can be used on carbon steel and concrete. Concrete must be clean, rough, and cured at least 28 days. If necessary this system can be applied to surfaces that are pitted or cannot be blasted. However, the service life will be reduced. 

Provides excellent barrier protection and is the most economical of the water lining systems or for water immersion. Normally used on carbon steel and concrete. 

PENNGUARD Adhesive/Membrane is a two-component urethane asphalt composition used in the installation of the PENNGUARD Block Lining System. As an adhesive, it serves to bond the PENNGUARD Block to a prepared substrate, and as a membrane, it serves as a moisture and chemical-resistant barrier. TUFCHEM II Membrane is an improved, two component, urethane asphalt based membrane system, that can be used, within its limitations, to protect concrete and steel surfaces from chemical attack and abrasion. 

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