(Read more about reducing bond failures caused by moisture vapor transmission.) What conditions will the overlay be exposed to?īe sure the overlay system is tough enough to withstand all the conditions it will confront. If it's too high, be sure to use a permeable overlay system that will permit the moisture vapor to escape. There are simple tests you can perform to check the moisture vapor emission rate of concrete. Too much moisture in the concrete substrate can also be a problem for some overlay systems, especially products that restrict the ability of the concrete to breathe or release moisture vapor as needed. Time: 02:49 CHOOSING THE BEST DECORATIVE CONCRETE OVERLAYĬonsider these factors when selecting your overlay system: What is the state of the existing floor?ĭoes the concrete have a lot of cracks or pitting? Is the surface out of level? If so, choose a higher-build material, such as an underlayment or self-leveling overlay, that can be applied at a thickness of 1/4 inch or greater. Many of today's decorative overlays use acrylics or acrylic blends because these resins provide excellent bond strength and UV resistance. Overlay manufacturers use different types of polymer resins, often blending them to produce proprietary products with distinct physical attributes. While most types of polymer-modified overlays offer similar performance benefits, each system has its own unique characteristics. They adhere well to existing concrete and resist damage from salt, chemicals, UV exposure, freeze-thaw conditions, and abrasion. Polymer-modified overlays can be applied in layers as thin as a credit card or up to several inches thick without delamination or failure. With the many options available, you're sure to find at least one system that meets your requirements for durability, appearance, maintenance, and cost.Īlthough cement overlays have been around for decades, many of today's systems blend polymer resins with cement, sand, and other additives to improve performance, wear resistance, and aesthetic qualities. We also give you pointers on how to choose the best system for a particular application. Here's a primer of the various overlay types available and the decorative options with each. There are multiple options available for achieving any look imaginable with a concrete overlay. Now, the real challenge is choosing from the many overlay types and the diverse array of decorative finishes possible. If your concrete has severe cracks or other damage, resurfacing will not solve your problems and pouring new concrete will be your best option. The underlying base for an overlay must be sound. Jeffrey Simons of Applied Research Associates (ARA) located in Sunnyvale, California.1 This report is complementary to the Technical Memorandum dated June 1999 which details the mix design and analysis and thickness design for the full-depth asphalt concrete section which will be placed in excavated sections under and adjacent to the bridge structures used as overcrossings for the freeway.Metallic Overlays See how you can add dazzle to your floors with a metallic coating.īefore you read any further, it's important to know that not all existing concrete floors can be resurfaced. All of the finite element analyses were performed by Dr. The analyses consist of a series of finite element simulations performed on idealized representations of an asphalt concrete overlay on an existing plain, jointed, portland cement concrete (PCC) pavement in which the 8 inch thick existing slabs will be broken and seated prior to placement of the overlay. This design is a part of the “Long Life Pavement” system under consideration for this heavily trafficked freeway which serves the Port of Long Beach, California. This technical memorandum summarizes the analyses performed and the design recommended for the overlay thickness for a portion of Interstate 710 in Southern California.
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