An F-class fly ash was tested in the laboratory for its physical and mechanical properties for use as a road sub-base in portions of a 2.1-mi (3.4-km) truck by-pass route in east-central Illinois. The testing showed that the fly ash would perform adequately and behave predictably as a road sub-base. Construction of the by-pass route started in early June 2002 and was finished in early September 2002. No unanticipated delays were encountered, and the performance of the fly ash fill exceeded expectations. Hopefully, these positive results will promote other projects around the country to use by-products of coal combustion products,...
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