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    "headline": "1972 Illinois Expressway Project Proves Coal Fly Ash Safe for Highway Construction",
    "dek": "Long-term monitoring of a 1972 Illinois expressway confirms coal fly ash is a stable alternative to traditional soil fills.",
    "prose": "In 1972, civil engineers in northern Illinois used 246,000 cubic yards of coal fly ash to construct the core of a 7,500-foot expressway embankment near Waukegan along US Route 41. [^1]\n\nLong-term monitoring of the Waukegan project found no evidence of structural settlement, frost heave, or problems caused by rising groundwater. [^2]\n\nIn 2002, almost 300 tons of crushed glass were used as fill material for a 200-foot section of Idaho Highway 75 near Ketchum. [^3]\n\nThe Federal Highway Administration included the Waukegan project in its detailed user guidelines for highway construction. [^4]\n\nThe project demonstrated that fine ash from coal-fired power plants could replace traditional soil and aggregate used as backfill in highway construction. [^5]\n\nThe glass fill was placed in an 8-to-12-inch layer beneath the road surface during a $5.6 million highway reconstruction project. [^6]\n\nThe Federal Highway Administration states that properly sized and processed cullet can behave similarly to gravel or sand. [^7]\n\nThe glass material was sourced from the Ohio Gulch Recycling Center in the Wood River Valley. [^8]",
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    {
      "statement": "In 1972, civil engineers in northern Illinois used 246,000 cubic yards of coal fly ash to construct the core of a 7,500-foot expressway embankment near Waukegan along US Route 41.",
      "source": "The Times Of India",
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      "statement": "Long-term monitoring of the Waukegan project found no evidence of structural settlement, frost heave, or problems caused by rising groundwater.",
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      "instrument": "News",
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    {
      "statement": "In 2002, almost 300 tons of crushed glass were used as fill material for a 200-foot section of Idaho Highway 75 near Ketchum.",
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      "instrument": "News",
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      "published_at": "2026-09-05T10:39:07.000Z",
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      "statement": "The Federal Highway Administration included the Waukegan project in its detailed user guidelines for highway construction.",
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    {
      "statement": "The project demonstrated that fine ash from coal-fired power plants could replace traditional soil and aggregate used as backfill in highway construction.",
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      "instrument": "News",
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      "statement": "The glass fill was placed in an 8-to-12-inch layer beneath the road surface during a $5.6 million highway reconstruction project.",
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      "statement": "The Federal Highway Administration states that properly sized and processed cullet can behave similarly to gravel or sand.",
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      "statement": "The glass material was sourced from the Ohio Gulch Recycling Center in the Wood River Valley.",
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