Illinois 1972 Fly Ash Expressway Project Proves Safe, Inspires Other States
In 1972, Illinois used coal fly ash as fill material for a highway embankment in a pioneering construction project. Decades of monitoring showed no significant problems with settlement, frost heave, or groundwater contamination. The project demonstrated that industrial byproducts can effectively replace natural aggregates in large-scale construction. Its success encouraged other U.S. states to develop their own standards for recycling fly ash in infrastructure projects.
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