Effect of composition on fly ash geopolymers

Abstract

The geopolymer technology provides a new good and green solution to the utilization of fly ash, avoiding its negative impact on environment and ecology. The aluminasilicate minerals in fly ash can be activated with alkali silicate solution to form geopolymer. In this study highly porous fly ash based geopolymer foams (GFs) were fabricated by a gelcasting technique using hydrogen peroxide as a pore former in combination with stearate based surfactant at different compositions. Moreover, factors that the influence amount of porosity and cell size distribution were investigated. We found that porous geoplymers with density values 620kg/m3 by this method. Interesting results will be reported.