Ultra-high strength hot-pressed geopolymeric composition and production method thereof

A method for producing an ultra-high strength hot-pressed geopolymeric composition comprising:

• a) mixing at least one aluminosilicate source and at least one alkali activator in a ratio of 1-50 wt % in any order to form a mixture,
• wherein the at least one aluminosilicate source is selected from the group consisting of fly ash, kaolin, metakaolin, palm ash, volcanic ash, rice husk ash, granite waste, silica fume, micro silica, any types of slag, natural pozzolans, silica, alumina, vitrified calcium aluminosilicate, ground recycled glass pozzolans, pulverized fuel ash, bottom ash, sugar cane bagasse ash, clays, natural aluminosilicate, synthetic aluminosilicate glass powder, zeolite, scoria, allophone, bentonite, and pumice and any mixture thereof, and
• wherein the at least one alkali activator is selected from the group consisting of a hydroxide of alkali metals, silicates of alkali metals, and anhydrous borax and any mixture thereof;
• b) pouring the mixture of the step (a) into a mold;
• c) fast hardening the mixture at a given pressure and temperature, under a steam-venting condition;
• and
• d) producing the ultra-high strength hot-pressed geopolymeric composition with a compressive strength of more than 100 MPa, by cooling the hot hardened material resulting from the step (c).