Development of Green Geopolymer Binders Based on Construction and Demoliton Wastes

This research focuses on the complete recycling of construction and demolition wastes (CDWs) to develop new green geopolymeric binders. An innovative mix design method based on (SiO2/Al2O3) and (Na2O/SiO2) chemical factors and liquids/solids (L/S) ratio was developed. The main focus was to optimize the compressive strengths of mixes incorporating mono, binary and ternary geopolymer systems of concrete waste (CW), red clay brick waste (RCBW) and ceramic tile waste (CTW). The effects of high temperature curing and the addition of supplementary cementitious materials (SCMs) were also investigated. Fresh properties comprising slump flow and setting time and mechanical characteristics including compressive strengths were investigated. Microstructural study was performed utilizing scanning electron microscopy (SEM), energy-dispersive X-Ray spectroscopy (EDS) and X-Ray Diffraction (XRD). This research proved the efficiency of the new mix design method in reaching high compressive strengths of mono-system of RCBW and CTW and all binary and ternary systems of geopolymer binders.