THE CONCRETE BRIDGE MAGAZINE

SUMMER 2007

ASPIRE is a quarterly magazine published by PCI in cooperation with the associations of the National Concrete Bridge Council. The editorial content focuses on the latest technology and key issues in the Concrete Bridge Industry.

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Precast, prestressed concrete, 190-ft-long I girders with WWR shear reinforcement. ASPIRE , Summer 2007 | 47 The Secret is Out: Structural WWR is a Superior Choice for Reinforced Concrete Many say that structural welded wire reinforcement (WWR) is the best-kept, timesaving, high quality, cost-cutting secret in the concrete reinforcement industry today—for any application that calls for traditional reinforcement. WWR is a highly controlled, cold-worked structural product, produced in standard and custom prefabricated sheets, with a higher yield strength than Grade 60 reinforcement. High-quality welds and computer-controlled spacing eliminate the time-consuming and less precise jobsite layout and tying that is typical of traditional reinforced concrete construction. The higher yield strength of the steel means less weight and less handling—often resulting in a reduction of as much as 50 percent in labor costs and less material. WWR is used in beams and girders, bridge decks, bridge rails, median barriers, sound walls, and more. Welded wire can also be epoxy-coated to meet special re- quirements in coastal or snowbelt states. Share in the secret today by contacting the Wire Reinforcement Institute. ABOUT THE WIRE REINFORCEMENT INSTITUTE The Wire Reinforcement Institute (WRI), headquartered in Hartford, Conn., is the world's leading association of manufacturers, allied industries, and professionals engaged in the production and application of structural welded wire reinforcement and related products for concrete reinforcement. The Institute advances the concrete industry by providing engineering scholarships and techni- cal, outreach, and promotional programs and materials on the applications and benefts of structural WWR. WRI works closely with de- sign frms, universities, owners, contractors, and government agencies to ensure adherence to the most accurate, up-to-date codes, standards, specifcations, and regulatory requirements. For more information on WRI or WWR, visit www.wirereinforcementinstitute.org or call 800-552-4WRI [4974]. American Coal Ash Association The American Coal Ash Association (ACAA) advances the management and use of coal com- bustion products (CCPs). Generically, CCPs are the residuals from coal combustion, such as fy ash, bottom ash, and boiler slag, or byproducts from air emission controls. In addition to a myriad of core performance attributes in construction and industry, CCP use can conserve natural resources, reduce greenhouse gas emissions, and eliminate the need for additional landfll space. Nearly 40 percent of 123 million tons of CCPs produced annually are used benefcially. Members of ACAA are located worldwide and include utility and non-utility CCP producers, as well as marketers, organizations, and individuals with commercial, academic, research, and other interests in CCP management. Members promote CCP use and manage- ment in ways that are environmentally responsible, technically sound, and commercially competitive. This mission is achieved through public and private sector partnerships, technical assistance, education, publications, meetings, and workshops. ACAA has developed strong partnerships with the Federal Highway Administration, Environmental Protection Agency, Department of Energy, Department of Agriculture, and others. Through these partnerships, the association helps provide information, education, and outreach to engi- neers, designers, specifers, end users, and regulatory agencies. Fly ash and cenospheres are CCPs often specifed for high performance concrete in bridge decks, piers, and footings. The recently completed $531 million Arthur B. Ravenel Jr. Bridge project in Charleston, South Carolina, used more than 30,000 tons of fy ash. Cal- trans, a state leader in the use of fy ash in paving projects, specifed high volume fy ash mixes for the largest bridge project in its his- tory—the San Francisco-Oakland Bay Bridge. Using innovative specifcations and blending techniques, Caltrans was able to improve the workability, permeability, and hardened concrete properties. A number of engineering standards and specifcations defne CCP applications, thus ensuring high quality performance and products. For more information, please visit www.acaa-usa.org. ASPIRE_Summer_2007.indb 47 5/15/07 11:44:12 AM

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