Structure formation processes of sustainable construction material from hazardous sewage sludge with additions of wood ash, and lime production waste

The main purpose of this work was to look for new application for hazardous sewage sludge, wood ash, and lime production waste for replacement of traditional natural construction raw materials with high environmental efficiency. The composites reached the 13.0 MPa of axial resistance strength value on the 28th day with 16.07% of the water absorption values, 1.0% of expansion coefficient, and 1.675 g/cm 3 of bulk density. The chemical, mineralogical, and granulometric compositions of the raw and developed materials studied by the complementary XRD, XRF, SEM, EDS, and LAMMA methods demonstrate a new mainly amorphous carbonate synthesis, responsible for the new structures formation with mechanical properties that exceed the requirements of the Brazilian technical standards. The results of the leaching and solubility tests showed their compliance with the Brazilian sanitary standards.