WATERPROOF COATINGS FOR CORROSION RESISTANCE IN CONCRETE STRUCTURES
AUSTRALIAN INSTITUTE OF WATERPROOFING(AIW)
Represents the interests of the waterproofing industry in raising the standard of waterproofing in Australia.
Concrete structures can face a myriad of lifecycle challenges, particularly when it comes to corrosion of steel reinforcement. Corrosion is the unseen enemy that can compromise the structural integrity and longevity of buildings. However, a study conducted in 2002, "Effect of waterproofing coatings on steel reinforcement corrosion and physical properties of concrete," sheds light on some potential solutions to this pervasive issue. This comprehensive research evaluates various waterproofing coatings, their effectiveness against corrosion, and their impact on the physical properties of concrete—a must-read for professionals seeking to enhance the durability of construction projects.
THE ROLE OF WATERPROOFING COATINGS
Concrete structures are constantly exposed to naturally occurring and manmade chemical attack along with climatic adversities, leading to concrete deterioration and, most critically, to the corrosion of reinforcing steel. The application of waterproofing coatings is a mitigation measure, improving the durability and thereby extending of the service life of concrete structures. By blocking the path of water, soluble salts (chloride ions) and other chemicals (Hydrocarbons), waterproofing coatings will reduce corrosion inducing attack by reducing water ingress, corrosion and other associated problems such as concrete spalling for example.
SUPERIOR PERFORMANCE OF POLYURETHANE-BASED COATINGS
The study highlights the superior performance of a polyurethane elastomer -based waterproofing material, which excelled in corrosion resistance and physical property enhancement compared to other coatings. Concrete specimens with polyurethane coatings exhibited the greatest resistance to accelerated corrosion, surpassing those coated with cement-based polymer- modified, epoxy-based, and standard cement-based materials. The findings demonstrated that polyurethane coatings also performed best in terms of water absorption, water permeability, and chloride permeability, making it the top choice for improving the durability and protecting concrete structures.
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THE IMPORTANCE OF CHOOSING THE RIGHT COATING
To optimise outcomes, selecting the right waterproofing coating is crucial. The research identifies that surface coatings (several different types (acrylic, epoxy polyurethane and cement modified coatings) were researched) will help to reduce the deterioration of concrete by preventing ingress of corrosive elements affecting the steel reinforc ement cover over time. As professionals, we must consider not only the immediate compliance requirements but also the long-term durability and resilience of the waterproofing solutions we choose. This study is a useful reminder that making informed decisions can ensure the longevity and integrity of concrete structures.
CONCLUSION: A STEP FORWARD IN CONCRETE DURABILITY
The implications of this study for the construction and waterproofing industry are profound but we should keep in mind that this study was conducted over 20 years ago and the chemical technology in each of the products has advanced significantly, it remains and interesting insight into the way waterproofing materials perform. For those committed to pushing the boundaries of what's possible in concrete construction, embracing the insights from this research will undoubtedly lead to stronger, mor e resilient structures, I highly encourage professionals and enthusiasts alike to access the full paper.
Written by: David Previte
SB 326 Deck Inspector * Building Envelope Expert * Waterproofing Problem Solver * Former CMCA Credentialed HOA Manager
2 个月What about admixes such as kryton/xypex type crystalline waterproofing?
Building & Waterproofing Consultant
2 个月Little bit more going on here than the failure of the waterproofing (if indeed there was any at this particular detail, but good post David, this is where we need/ should be involved at design stage.
Director of NJK Consulting Engineers
2 个月good post David