ASPIRE Summer 08 - Aspire - The Concrete Bridge Magazine

American Coal Ash AssociationThe Romans used volcanic ash to build structures that we admire over 2000 years later. Engineers today can achieve the same high-strengthendurance using coal combustion products (CCPs)—materials produced when we burn coal to generate electricity.Though the material properties vary according to coal composition and power plant operating conditions, experts can advise on quality anddetermine the best mix design for almost any condition and project. Mix designs exceeding 40% fly ash have proven successful in many projects.Experts with first-hand experience may be located by contacting the American Coal Ash Association, an industry association devoted toeducating designers, engineers, concrete professionals, regulatory officials, and others about CCPs’ technical, environmental, and commercialadvantages.Fly ash concrete has been specified because of its high strength and durability for the John James AudubonBridge near Baton Rouge, La. When complete, it will be longest cable-stayed bridge in North America.The California Department of Transportation (Caltrans), a leader in fly ash concrete projects, requiredhigh volume fly ash mixes for the largest bridge project in its history—the San Francisco-Oakland BayBridge. Using innovative specifications and blending techniques, Caltrans was able to improve the workability,hardening, and permeability properties of the bridge’s concrete. A number of engineering standards andspecifications define CCP applications, thus ensuring high quality performance and products.In addition to a myriad of core performance attributes in construction and industry, CCPs use can conserve natural resources, reducegreenhouse gas emissions, and eliminate the need for additional landfill space. For more information, contact ACAA at info@acaa-usa.org orcall 720-870-7897.TAKING THE LOAD OFF…Bridges Around the WorldGeorge P. Coleman Memorial Bridge - VirginiaLightweight concrete deck on widened replacementtrusses.EconomicalSolutions forRehabilitating Bridges– Proven Enhanced Durability– Reduced Deck Weight Increases Rating– Use Wider Deck on Same Structure– Reduced Weight for Precast Elements– Reduced Seismic and Foundation Loads– Consistent Quality and Properties– Easy Pumping and Placement– Shipped anywhere in the US and World!Mattaponi River Bridge - VirginiaLightweight concrete deck andlong-span spliced girders.HIGH PERFORMANCE LIGHTWEIGHT AGGREGATE800.898.3772 704.637.1515www.stalite.com10857_Carolina_Stalite_Company_fall07.indd 18/23/07 10:00:30 AMASPIRE, Summer 2008 | 49