Fly ash-based foam geopolymer, preparation method therefor, and use thereof

A fly ash-based foamed geopolymer, wherein raw materials for preparing the fly ash-based foamed geopolymer comprise the following components in parts by weight:

• 900-1000 parts of a fly ash-based material;
• 600-700 parts of a composite alkali solution;
• 0-10 parts of a thickener;
• 2-6 parts of a foam stabilizer A;
• 5-10 parts of a water reducer;
• and
• 20-40 parts of a foaming agent;
• wherein the fly ash-based material is prepared by the following preparation method:
• mixing fly ash with a calcareous material to obtain the fly ash-based material;
• wherein based on a mass of the fly ash-based material being 100%, the fly ash has a content of 90%-100%, and the calcareous material has a content of 0%-10%;
• wherein the calcareous material comprises any one or a combination of at least two of cement, ore slags, gypsum or metakaolin;
• wherein the composite alkali solution is prepared by the following preparation method:
• mixing a composite alkali activator, a metal complexing agent and a foam stabilizer B to obtain the composite alkali solution;
• based on a mass of the composite alkali solution being 100%, the composite alkali activator has a content of 95%-98%, the metal complexing agent has a content of 0.05%-0.5%, and the foam stabilizer B has a content of 1.95%-4.5%;
• wherein the foam stabilizer A comprises trisodium phosphate and/or calcium stearate powders;
• the foam stabilizer B comprises any one or a combination of at least two of sodium dodecylbenzenesulfonate powders, sodium dodecyl sulfate powders, trisodium phosphate powders or calcium dodecyl sulfate powders.