Celebrate World Corrosion Awareness Day with 20% off eCourses and eBooks with code WCAD2024 at checkout!
On October 4, 2011, SSPC held the inaugural meeting of a new committee developed to address commercial coatings and flooring issues. The committee is called, “C3 Commercial Coating Committee (Architectural, Commercial, Institutional).” The committee agreed to address five topic areas: field cleaning and painting, paint materials, flooring, thin film air/vapor barriers on Concrete Masonry Unit (CMU), and commercial contractor certification. Key concerns in each of the topic areas were identified which resulted in the following scopes and work activities.
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With new regulations restricting the use of toxic metals and chemicals, the marine coating industry is in need of new coatings. Ideally, these new materials should be non-toxic and biologically inert but still prevent the adhesion of marine life. The coatings should be easy to apply, cure rapidly and be relatively tough elastomers.
This paper describes the evaluation of the Organofunctional silanes in mitigating ongoing corrosion due to chlorides or carbonation.
Embedded galvanic anodes designed to protect reinforcing steel in chloride-contaminated concrete adjacent to concrete “patch” repairs were developed in the late 1990’s. The original concrete anode was puck-shaped and consisted of high purity zinc encased in a mortar formulated with high porosity and lithium hydroxide to maintain a pH greater than 14 to keep the zinc active over the life of the anode. This approach of a high pH mortar around the zinc to prevent anode passivation is commonly referred to as alkali-activation.
Upon installation of a typical thin film coating system, extensive dynamic cracking was discovered in concrete chemical secondary containment structures. After multiple failed attempts to repair cracks using standard coating products, the decision was made to proceed with equipment installation in hopes of maintaining schedule while the coating details could be evaluated.
Several coating systems and designs were chosen to protect a concrete chamber with side walls coated with a polyvinylidene fluoride (PVDF) material. When polyurea was identified as the coating to be used at this engineering pilot plant, which contains harsh caustic chemicals in conjunction with PVDF coated panel walls; an extensive research was conducted to determine which method will be utilized to create a seamless protective film between these two systems.
Polyurethane coating systems on parking structures are designed to prevent leaks, protect the concrete from deterioration, and prevent corrosion in the reinforcing steel
Spray applied polyurea was introduced to the construction industry in the late 1980 s. By the 1990 s, polyurea floor systems were being installed using early formulations of polyurea, and spray equipment adapted from the polyurethane foam industry. Advancement in raw materials, polyurea formulations, specialized equipment and contractor expertise in recent years has provided increased opportunities for this technology to be used in a wide variety of concrete flooring applications.
Because process shutdowns are expensive, it is desirable to speed up the turn-around time when applying protective coating systems on concrete. Rapid installation of surfacing materials on concrete can be problematical due to inadequate surface preparation, residual moisture, low surface tensile strength, and poor compatibility between the concrete substrate repair materials and the protective coating system.
The practice of lining concrete substrates has increased exponentially over the past thirty (30) years, most notably in the wastewater treatment industry. Environmental regulations, coupled with changes to treatment processes, have resulted in far more severe environments in which concrete can and will corrode.