Utilize Cementitious High Carbon Fly Ash (CHCFA) to Stabilize Cold In-Place Recycled (CIR) Asphalt Pavement as Base Course

79579 Because of stringent environmental regulations, the power generation industry must take measures to reduce the emission of NOx and SOx. Low-NOx burners reduce emissions by changing the combustion characteristic of coal boilers, but they increase the amount of residual unburned carbon in the fly ash. Increased carbon levels in fly ash make air-entrained concrete production more difficult , because the activated carbon absorbs the desired air voids in the concrete. As a result, most high-carbon-content fly ash has to be landfilled, resulting in significant land purchase costs and potential environmental issues. This project will develop technology for using this fly ash as a base course for asphalt pavements. Unlike concrete, which needs air voids, minimal air void content is preferred. Phase I will involve the stabilization of pulverized cold in-place recycled materials with cementitious high carbon fly ash. Commercial Applications and other Benefits as described by the awardee: The technology offers the potential to use one hundred percent of the cementitous high carbon fly ash that otherwise would be landfilled, eliminating the costs of disposing and landfilling.