A 457-m (1,500-ft) runway pavement extension is planned for the Georgetown-Scott County Airport (Marshall Field). The clay subgrade of the existing paved runway was stabilized with six percent (dry weight) hydrated lime. A request was made by the Kentucky Transportation Cabinet, Division of Aeronautics, to determine the feasibility of replacing a percentage of the hydrated lime stabilizer with fly ash for the extended runway subgrade. Kentucky Highway Investigative Task No. 27 was issued by the Transportation Cabinet to fund a laboratory study to determine the effects of partially replacing lime with Type F fly ash (FA). Using fly ash to replace lime could potentially, reduce stabilization cost and provide a means of using fly ash as a byproduct in lieu of landfill disposal. The subgrade extension was previously constructed to final grade with clay soils. A thin layer of topsoil and grass currently covers the subgrade. Stabilization of the extended runway is planned during pavement construction.
Digital Object Identifier
Beckham, Tony L. and Hopkins, Tommy C., "Stabilization of an Airport Subgrade using Hydrated Lime and Fly Ash" (1997). Kentucky Transportation Center Research Report. 527.