This research project will help determine if and how recovered stockpiled fly ash and fluidized bed combustion (FBC) fly ash can be used as viable and high performance pozzolans for concrete. Supplementary cementitious materials (SCM) are key ingredients in today’s concrete and can vastly improve the durability and sustainability of concrete mixtures. While the demand for fly ash (the most commonly used SCM) and other suitable pozzolans continues to escalate, the supply of high-quality and economically available fly ash has been shrinking. While alternative sources of fly ash do exist (e.g., landfilled or ponded fly ash), these have not been used due to lack of guidelines and protocols to evaluate the performance of these ashes and identify necessary beneficiation procedures before they can be incorporated into concrete mixtures. This study seeks to evaluate the feasibility, performance, and beneficiation of two promising alternative sources of fly ash: recovered dry disposed (stockpiled) fly ash, and FBC fly ash. The project findings will be used to potentially develop new ACI guidelines for the evaluation and use of recovered fly ash and FBC fly ash in concrete.