As known, more than 1600 million tons of Portland cement is produced annually with nearly one ton of CO2 per ton of clinker produced. Due to the environmental impact of cement industries and high energy cost many researchers try to produce new binding material to save energy and to produce new innovative zero materials waste . The current research aims to investigate new binder materials as alternative of Portland cement. Alkali activated slag(AAS) blended with sewage sludge ash (SSA) will be studied in this research. Sewage sludge was conducted with at 650 C(SSA1) and 850 C(SSA2) for 4 hour ground granulated blast furnace slag GGBFS was partially replaced by SSA1and SSA2 at both conducted conditions with 0, 5, 10, 20 and 30% by GGBFS weight. 18% of Sodium hydroxide was used as alkali activator in this study the pastes were hydrated up to 90 days. The investigation included compressive strength and the microstructure of alkali activated GGBFS pastes without and with replacement by SSA1 and SSA2 was assessed through a variety of Infrared (IR) spectroscopy and Scanning Electron Microscopy (SEM) to evaluate the best degree of incineration for SSA. The results indicated that 10% SSA1 incinerated at 650 C replacement of alkali activated slag replacements the optimum replacements to produced geopolymers building materials as green building materials.
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