RESIDUAL ALUMINO-SILICATE MATERIALS (FLY ASH, SLAG, CLAY, AND GLASSWARE) FOR A NONCONVENTIONAL ECOLOGICAL POLYMER OF THE FUTURE

Abstract

Alumino-silicate wastes frequently used in the manufacturing process of geopolymer composites (fly ash and blast furnace slag) were mixed with alumino-silicate wastes non-used previously in this process (clay brick waste and glassware waste). The mixture activation with an alkaline activator based on NaOH 8M and Na2SiO3 aqueous solution that facilitates the geopolymerization reaction developing contributed to the conversion of waste into geopolymer composite, a new type of cheap and ecological materials with mechanical and physical properties suitable for the building sector. The optimal characteristics of specimens were: density of 2042 kg·m-3, apparent porosity of 19.6 %, compression strength of 53.7 MPa, and water absorption of 6.9 vol. %.

Keywords

• alumino-silicate waste
• geopolymer composite
• fly ash
• slag
• alkaline activator
• compression strength