Use of fly ashes from municipal sewage sludge combustion in production of ash concretes

Abstract

Application of fly ashes from combustion of municipal sewage sludge (FAMSS) in the concrete technology realizes assumptions concerning the European Union’s waste management proposal. This study investigates the influence that a partial replacement of the Portland cement by these ashes would exercise on the strength parameters of concrete if compared to a reference concrete and concretes containing conventional admixtures in their composition, such as siliceous and calcareous fly ashes. Potential environmental impact of FAMSS application was investigated through the determination of heavy metals leachability. Results conveyed that the concretes containing fly ashes from combustion of municipal sewage sludge improved strength parameters and frost resistance as well as satisfied the environmental requirements imposed on leaching of heavy metals.