Assessing Environmental Impacts Associated with Bases and Subgrades Stabilized with Coal Combustion Products (CCPs)

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Primary Investigators

Tuncer Edil & Craig Benson
Department of Civil and Environmental Engineering
University of Wisconsin – Madison


Conventional construction materials are becoming increasingly expensive as demands on resurces intensify. In addtion, concerns regarding energy use and greenhouse gas emission associated with manufacturing and delivering conventional construction materials has led to significant interest in exploring alternative materials such as recycled materials. Stabilizing bases and subgrades with coal combustion products (CCPs) represents a way to uprade highway infrastructure while utilizing recycled materials. This project will use WiscLEACH to assess groundwater impacts caused by the leaching of trace elements from pavement materials stabilized with CCPs.


  • Determine groundwater impacts of pavement materials stabilized with CCPs.
  • Analyze how different pH conditions affect leaching from CCP materials.
  • Prepare a report describing the findings from the leaching tests and the modeling efforts.


  1. Select three fly ashes that represent a range of conditions in the Midwest.
  2. Observe leaching over a range of pH conditions that bracket conditions typically observed in the field.
  3. Use analytical solutions to predict groundwater concentrations beneath a highway and compliance with water quality standards.
  4. Evaluate potential impacts on groundwater with WiscLEACH using the data collected from leaching process.

Project Information

  • Duration: 12 months
  • Dates: November 15, 2007 – December 31, 2008
  • Budget: $49,542
  • Modal Orientation: Energy and Environment
  • Project ID: CFIRE 01-03
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