Evaluation of the Pozzolanic Activity of Uncontrolled-Combusted Sewage Sludge Ash

Waste management is a crucial issue facing modern society. The generation of sewage sludge increasing annually due to the urbanization and improvement sanitation systems cities. construction sector has emerged as solution for elimination waste enormous volume materials that this can absorb. This paper evaluates pozzolanic activity ash (USSA) obtained following an uncontrolled-combustion process, simple economic procedure. Compressive strength Portland cement/USSA mortars with 5%–25% by weight USSA were evaluated. Calcium hydroxide/USSA pastes chemically physically characterized through thermogravimetric/differential-thermogravimetric (TG/DTG), Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), scanning electron microscopy (SEM) analyses. increase in replacement cement associated compressive mortars. These values containing cured 90 days range 49.6–55.4 MPa, higher than one reached reference mortar. According microstructural analysis, increment on be attributed formation hydrated products (C? S? H, C? A? H) reaction USSA.