Utilization of PCC Fly Ash and Dry Bottom Ash Portland Cement Composites in Deep Foundation

摘要

The research presented herein is intended to examine the extent to which the Pulverized Coal Combustion (PCC) fly ash and dry bottom ash can be used, as a secondary cementitious material and a fine aggregate, respectively, in construction of drilled shafts. Four different Portland cement composites and a reference concrete were investigated. A constant water-to-cementitious materials ratio of 0.47 and a cement factor of 335 kg/m~3 were used throughout the investigation. Test results reveal that the selected PCC dry bottom ash and fly ash Portland cement concretes had excellent mixability, consolidability, and finishability similar to that of the reference mixture. The trial PCC bottom ash and fly ash matrices displayed short-, intermediate-, and long-term characteristics which were comparable to those of the control concrete.