The Tennessee Valley Authority (TVA) and the Kentucky Energy Cabinet (KET), have been sponsoring research into the production of AFBC concretes made with coal combustion ashes. Atmospheric fluidized bed combustion (AFBC) spent bed ash (SB) and pulverized fuel ash (PFA) were substituted for river sand and cement in the production of AFBC concrete. PFA and SB are both required to provide the pozzolanic reactions necessary for strength development. Moreover, the SB has the granular consistency of a fine aggregate and serves as a total replacement for river sand. However, a preconditioning step (prehydration) of the SB is required to control heat release and molar volume expansion.