Abstract
Waste glass (WG) was revalorized as a precursor into novel sustainable alkaline cements activated with Na2CO3 and NaOH; pastes and mortars were studied. The experimental variables were %Na2O (1.5, 3 and 6 %wt.) using a blend 1:1 of NaOH:Na2CO3. The WG was partially replaced with CaO, which had a synergistic favorable interaction with Na2CO3 that promoted the dissolution of glass, resulting in the formation of cementitious hydraulic products with 180-day strengths up to ∼ 28 MPa. Characterization by XRD, SEM, EDS, FTIR, and 29Si NMR evidenced cementitious matrices with low Ca/Si ratio, composed by silica gel and C-S-H intermixed within a three-dimensional network.
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