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Composite alkali activated cements of waste glass (WG) and ground granulated blast furnace slag (GGBFS) were studied in pastes for 720 daysThe factors for the experimental design (Taguchi method) were: %WG, sodium silicate modulus (Ms), curing temperature, and %ultra-fine WG; the response variable was the compressive strength.  29 Si Nuclear Magnetic Resonance, scanning electron microscopy, energy dispersive spectroscopy, and X-ray diffraction indicated that the reaction products in pastes with WG contents greater than 50% were predominantly silica gel, which reached up to 140 MPa; on the other hand, phases of C-S-H/C-A-S-H predominated in pastes with GGBFS content &gt; 50%, which showed high early strength. Silica gel performed as a cementitious phase contributing to the 720-days strength, but it was unstable underwater; however, it was stabilized when intermixed with C-S-H/C-A-S-H. Curing at 40-60 °C promoted cracking and strength loss after 14 days.

Compressive strength and microstructure of alkali-activated waste glass-slag cements