GEOPOLYMERIC CEMENT AND METHODS FOR PREPARING SAME

摘要

A geopolymeric cement prepared by means of a geopolymeric reaction between two reactive elements, i.e. an aluminosilicate oxide of formula (I): [Si2O5,Al2O2]9[Si2O5,Al2(OH)3], and a hydrated alkaline oligo(sialate-siloxo) compound of formula (II): (SiO2AlO2)(SiO3)2-3(OH)2-3(Ca,Na,K)1-3, having cation Al in IV co-ordination at 70±8 ppm as determined by the nuclear magnetic resonance analysis spectrum MASNMR for 27Al. Said hydrated alkaline oligo(sialate-siloxo) compound is produced in situ by alkaline activation of an alkali glass of formula (III): (Na¿u?Kv)1-2(Alw,Six,MgyFezO6-7)(CaO)1-2, wherein u+v=1; w+x+y+z=2.5-5; and x » 1.5. The two ingredients, namely the aluminosilicate oxide and the alkali glass, are produced in the same industrial facility. Said aluminosilicate oxide is produced by calcination at a temperature below 1000 °C using the residual hot gases from the process of vitrifying said alkali glass at 1000-1350 °C.