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Waterproofing on Concrete Structures - Lesson Summary

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Coating is very important and contribute to enhancing the durability of concrete infrastructures. There are many types of coating. The most common are:

Alkyd coatings
Chlorinated rubber coatings
Epoxy coatings
Zinc coatings
Polyurethane coatings
Polyurea coatings
Clean room coatings

 
Epoxy coatings have contributed in a large way to the development of coating systems for a wide range of applications from nuclear containment coatings to protection of immersed structures / pipelines to high polluted zones
 
Waterproofing is tremendously important for concrete structures. Understanding the various sources of water allows the design systems to prevent leakage from these sources. There are three types of waterproofing systems:

Barrier system
Drainage system
Diversion system

 
The barrier waterproofing system completes barrier to water infiltration.
 
The drainage waterproofing system permits water absorption and some infiltration through the substrate and provides a means to collect this water and divert it back out to exterior before it causes leakage.
 
The diversion waterproofing system redirects water forced against envelope components and diverts it elsewhere.
 
Control joints, expansion joints, precast concrete joints and the roof must also be waterproofed for the safety and durability of concrete structures. The use of sealants is very important:

Sealant used in expansion joints must be elastic and made up of good waterproofing materials
Sealant must be sized correctly to avoid stress that can result in cohesive and adhesive failure
Backer rod depth should be uniform and is crucial for proper sealant installation
During repair, old sealant must be removed before application of a new one