Geopolymer material for panels

A geopolymeric aqueous mixture comprising the following inorganic components in the following parts by dry mass:

• metakaolin 15-65
• potassium silicate and/or sodium silicate 20-40
• aggregates recycled from Construction and Demolition Waste (CDW) 5-300
• blast furnace slag 0-60
• fly ash 0-25
• sodium citrate 0-25,
• said geopolymeric aqueous mixture being obtained by:
• mixing 20-175 parts by mass of water with said inorganic components, said geopolymeric aqueous mixture having a viscosity at 23° C. between 100 and 10000 Pa·s, wherein
• i) viscosity is measured via Brookfield methodology,
• ii) said aggregates recycled from CDW belong to one or more of the classes 17.01.01, 17.01.02, 17.01.03, 17.01.07 according to the European waste catalogue,
• said aqueous geopolymeric mixture being selected from the following ones:
• an aqueous geopolymeric mixture (1):
• having:
• a viscosity at 23° C. between 100 and 150 Pa·s, a working time at 23° C. of not less than 70 min;
• and consisting of metakaolin:blast furnace slag:fly ash:potassium silicate CDW:Total H2O in the corresponding parts by mass 34:23:11:31:93:38, wherein the molar ratio Si/Al˜2.2 and the molar ratio K/Al˜0.80, wherein the potassium silicate has a molar ratio SiO2/K2O=1.9 and a solvation water content of 38 parts by mass and the CDW is a blend consisting of concrete and bricks with a particle size of 1 to 2 mm and 0 to 1 mm, with the two particle size fractions mixed in a mass proportion between 3:2 and 2:1, respectively;
• a thixotropic aqueous geopolymeric mixture (II):
• with viscosity at 23° C. between 2000 and 5000 Pa·s and
• consisting of metakaolin:blast furnace slag:fly ash:potassium silicate CDW:Total H2O in parts by weight respectively of 37:37:0:27:100:32-41 wherein the molar ratio Si/Al˜2.3 and the molar ratio K/Al˜0.75, wherein the potassium silicate has a molar ratio SiO2/K2O=1.9 and a solvation water content of 32 parts by mass and the CDW has a particle size of less than 2 mm;
• and
• a thixotropic aqueous geopolymeric mixture (III):
• with viscosity at 23° C. between 2000 and 5000 Pa·s
• consisting of metakaolin:blast furnace slag:fly ash:potassium silicate:CDW:Total H2O in parts by weight respectively of 38:38:0:24:70:30-36 wherein the molar ratio Si/Al˜2.0 and the molar ratio K/Al˜0.75, wherein the potassium silicate has a molar ratio SiO2/K2O=1.4 and a solvation water content of 30 parts by mass and wherein the CDW has a particle size of less than 2 mm.