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Concrete and other cementitious surfaces are porous materials that will allow water and soluble contaminants to penetrate the structure leading to degradation. The effects of degradation can include efflorescence, laitance and physical defects such as cracking and spalling. Waterproofing concrete can protect it from freeze/thaw cycles, increase chemical resistance, and provide protection to imbedded reinforcing steel.
Concrete and other cementitious surfaces are porous materials that will allow water and soluble contaminants to penetrate the structure leading to degradation. The effects of degradation can include efflorescence, laitance and physical defects such as cracking and spalling. Waterproofing concrete can protect it from freeze/thaw cycles, increase chemical resistance, and provide protection to imbedded reinforcing steel. Waterproofing coatings for concrete may include silicon-based water repellant sealers and a variety of organic coatings. Water repellent materials have minimal dry film thickness over the concrete surface, are generally not opaque and need replaced periodically. Thicker film coatings function by providing a physical barrier ranging from a few mils to 100 mils and greater depending on the coating type. Typical organic coating types include acrylic, vinyl, epoxy, polyurethane and specialized elastomeric coatings. Concrete surfaces must be properly prepared before the application of any waterproofing coatings. Methods may include mechanical abrasion, pressurized water cleaning and acid etching.
The Federal Highway Administration has a top-level technology goal targeted toward the development and deployment of the “Bridge of the Future.” This is a conceptual short span bridge that demonstrates significant improvements over the current state of the practice – particularly with regard to ease and speed of construction and long-term durability.
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Now that you as a specialty coating / lining contractor have joined the fast-growing technology of polyurea elastomeric coating & lining systems, what’s the next step? The polyurea technology has grown in use by significant volumes since the initial start in the early 1990’s. Applications include concrete coatings / linings, steel coatings, traffic deck systems and specialty coatings.
Cracks in a concrete substrate pose a challenge for coatings. Cracks that are not properly identified and addressed can lead to premature failure of the coating. This paper will discuss the forces that cause cracking in concrete structures, as well as crack types and repair techniques.