Materiales de Construcción, Vol 64, No 314 (2014)

Sodium silicate solutions from dissolution of glasswastes. Statistical analysis


https://doi.org/10.3989/mc.2014.05213

M. Torres-Carrasco
Eduardo Torroja Institute for Construction Sciences (IETcc-CSIC) (Madrid, Spain), Spain

J. G. Palomo
School of Building Engineering (EUATM-UPM) (Madrid, Spain), Spain

F. Puertas
Eduardo Torroja Institute for Construction Sciences (IETcc-CSIC) (Madrid, Spain), Spain

Abstract


It has studied the solubility process of four different waste glasses (with different particle sizes, <45 µm and>125 µm) in alkaline solutions (NaOH and NaOH/Na₂CO₃) and water as a reference and under different conditions of solubility (at room temperature, at 80°C and a mechano-chemical process). Have established the optimal conditions of solubility and generation of sodium silicates solutions, and these were: the smaller particle size (<45 µm), with NaOH/Na₂CO₃ solution and with temperature during 6 hours of stirring time. The statistical analyses of the results give importance to the studied variables and the interactions. Through ²⁹Si NMR MAS it has confirmed the formation after dissolution processes of monomeric silicate, suitable for use as an activator in the preparation of alkaline cements and concretes.

Keywords


Waste glass; Alkaline cements; Solubility; Sodium silicate hydrates (waterglass); Alkaline activators

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