It may be necessary to remove the old pavement, remove the debris, and install new materials in order to replace a severely degraded road. An alternative strategy was attempted by engineers in Jackson County, Missouri. The road itself was repurposed, and the ground pavement was combined with water and coal fly ash to create a new base for an asphalt surface. The project covered 2.36 miles of rural roads and used nearly 1,700 U.S. tons of Class C fly ash, a byproduct of coal-fired power generation. The U.S. Environmental Protection Agency’s case study documents the project’s length, donated materials and reported cost savings.
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