One current method of sludge disposal is incineration. Although incineration reduces the volume of sludge, it is not a final solution since it generates ash that must subsequently be disposed of. This study assesses the feasibility of utilizing the ash derived from sewage sludge incineration (SSA) as a component of concrete. Considering the chemical and physical properties of sewage sludge ash, an attempt was made to introduce it into concrete as a partial replacement of natural aggregate. The untreated ash was used as lightweight aggregate. Properties of innovative material derived from sludge and its suitability for concrete technology were discussed. It was found that the waste aggregate strongly influenced mechanical and physical properties of concrete, but the strength characteristics required for structural concrete could be reached.