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ACPA Home Membership Benefits of Membership Application Concrete Pavement Technologies Resources CP Tech Center Blog and News About Mission/Purpose Board of Directors Staff Contact Welcome to the American Concrete Pavement Association The ACPA is a non-profit organization representing the concrete paving industry in the Northwest region. The Chapter is recognized by highway officials, engineers, contractors, and paving experts as the regions voice for the concrete paving industry. Latest Updates and Chapter News Pavement Rehabilitation with Unbonded Concrete Overlays Created: Monday, 05 December 2016 10:37 pm Written by Jim Powell Article originally published in the Spring-Summer 2016 edition of the Colorado Public Works Journal As noted in the May 2014 Guide to Concrete Overlays” published by the National Concrete Pavement Technology Center (CP Tech Center), shrinking budgets and ever-increasing traffic volumes have necessitated the immediate need for engineering strategies to preserve and maintain the nation’s roadways. One such approach is an unbonded concrete overlay. Unbonded concrete overlays are used to restore structural capacity to existing pavements ranging from moderately to significantly deteriorated. The term unbonded” simply means that bonding between the overlay and the underlying pavement is not needed to achieve desired performance. Thus, the overlay performs as new pavement and the existing pavement provides a stable base. Source: Guide to Concrete Overlays: Sustainable Solutions for Resurfacing and Rehabilitating Existing Pavements” (www.cptechcenter.org) There are several benefits of using unbonded concrete overlays, including the solution’s cost-effectiveness. According to the CP Tech Center, dollar for dollar, they are one of the most effective long-term pavement preservation and major rehabilitation options for existing pavements.” Other benefits of unbonded concrete overlays include their quick construction, ease of maintenance, and sustainability assets. In general, unbonded resurfacing is highly reliable, offering longer design life than road rehabilitation with asphalt. It has been used successfully by several states, providing on average more than 30 years of good-to-excellent performance, according to the CP Tech Center. Innovative methods of construction are continuously being explored, and Route D south of Kansas City, MO was the first in the nation to use a fabric bond breaker in 2008. The 3.7 mile long unbonded overlay was constructed in 50 days with a 5” minimum concrete thickness and 6’ x 6’ jointing on a 24’ wide road carrying 9,300 ADT (5% trucks). The new surface has now been serving the traveling public for 8 years, and a 2015 visual distress survey demonstrated that it is performing extremely well. The NW Chapter of ACPA can provide further education on material considerations for long-lasting concrete overlays, and will gladly review potential projects to identify which option(s) are best for your situation. For more information, please contact us . Member Directory Products Services Coming in Spring 2017 Upcoming Workshop/Events Coming in Spring 2017We are a non-profit organization representing the concrete paving industry in the Northwest region. Our membership includes contractors, materials suppliers, equipment manufacturers, and other firms providing essential services to the concrete paving industry. Our purpose is to improve and extend the use of Portland cement concrete in the construction of pavements and to assist the cement and concrete paving industries in technical, educational, and promotional aspects, ensuring continued successful use of the material with economy to serve the needs throughout the Northwest for pavement construction. Contact ACPA 2626 12th Ct. SW. Suite 2 Olympia, WA 98502 Phone: 360.956.7080 Copyright © 2016-2020 ACPA. All...