30-05-2013, 12:51 PM
ACTIVATED FLY ASH AS A BINDER IN PAVEMENT
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ABSTRACT
Coal fly ash is a coal combustion product that has numerous applications in highway construction. Since the first edition of Fly Ash Facts for Highway Engineers in 1986, the use of fly ash in highway construction has increased and new applications have been developed. This document provides basic technical information about the various uses o highway Construction. Fly ash has been used in roadways and interstate highways since the early 1950s. In 1974, the Federal Highway Administrat encouraged the use of fly ash in concrete pavement with Notice 5080.4, which urged states to allow partial substitution of fly as for cement whenever feasible. In addition, in January 1983, the Environmental Protection Agency published federal comprehensive procurement guidelines for cement and concrete containing fly ash to encourage the utilization of fly ash and establish compliance deadlines. This document is sponsored by the U.S. Department of Transportation,through the federal highwayAdministration, in cooperation with the American Coal Ash Association and the United State Environmental Protection Agency. The United States Government assumes no liability for its contents or use.The Federal Highway Administration endorses no products or manufacturers. This publication does not constitute a standard,specification, or regulation.The United States Environmental Protection Agency supports the beneficial use of coal combustion products as an important priority and endorses efforts by the Federal HighwayAdministration as described in this document.