In 1972, Illinois used 246,000 cubic yards of coal fly ash beneath 7,500 feet of expressway; monitoring found no evidence of settlement, frost or capillary-rise problems
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September 5, 2026
More than five decades ago, civil engineers in northern Illinois carried out a major engineering experiment by using 246,000 cubic yards of coal fly ash beneath 7,500 feet of a major expressway embankment. The pioneering project, completed in 1972 near…