A product comprising: a geopolymer composite binder comprising: one or more Class F fly ash materials, one or more gelation enhancers, and one or more hardening enhancers; one or more alkaline activators; one or more aggregates; and one or more foaming agents; wherein each of the one or more Class F fly ash materials comprises 15 wt.% or less calcium oxide; wherein the one or more alkaline activators comprise an alkaline activator solution comprising one or more metal hydroxides, one or more metal silicates, and water; wherein the one or more gelation enhancers are selected from the group consisting of metakaolin, metahalloysite, micron and nanoparticles of silica and alumina, and pozzolanic aluminosilicate materials that have a low alkali-earth oxide content and a high dissolution rate in alkaline solution; wherein the one or more hardening enhancers are selected from the group consisting of ground granulated blast furnace slag, Class C fly ash, vitreous calcium aluminosilicate, kiln dust, CaO-rich pozzolanic aluminosilicates, and combinations thereof; wherein the one or more foaming agents comprise aluminum powder or a peroxide-based foaming agent; wherein the geopolymer composite binder is a Portland cement-free binder; wherein the product is a geopolymer composite cellular concrete (GCCC); wherein an amount of the one or more Class F fly ash materials is 1 to 50 wt.% of the product, an amount of the one or more gelation enhancers is 1 to 50 wt.% of the product, and an amount of the one or more hardening enhancers is 1 to 50 wt.% of the product; and wherein the product has an apparent density of 1200 kg/m 3 to 1800 kg/m 3 and a 28-day compressive strength of at least 17 MPa or 2500 psi. a geopolymer composite binder comprising: one or more Class F fly ash materials, one or more gelation enhancers, and one or more hardening enhancers; one or more alkaline activators; one or more aggregates; and one or more foaming agents; one or more Class F fly ash materials, one or more gelation enhancers, and one or more hardening enhancers; one or more alkaline activators; one or more aggregates; and one or more foaming agents; wherein each of the one or more Class F fly ash materials comprises 15 wt.% or less calcium oxide; wherein the one or more alkaline activators comprise an alkaline activator solution comprising one or more metal hydroxides, one or more metal silicates, and water; wherein the one or more gelation enhancers are selected from the group consisting of metakaolin, metahalloysite, micron and nanoparticles of silica and alumina, and pozzolanic aluminosilicate materials that have a low alkali-earth oxide content and a high dissolution rate in alkaline solution; wherein the one or more hardening enhancers are selected from the group consisting of ground granulated blast furnace slag, Class C fly ash, vitreous calcium aluminosilicate, kiln dust, CaO-rich pozzolanic aluminosilicates, and combinations thereof; wherein the one or more foaming agents comprise aluminum powder or a peroxide-based foaming agent; wherein the geopolymer composite binder is a Portland cement-free binder; wherein the product is a geopolymer composite cellular concrete (GCCC); wherein an amount of the one or more Class F fly ash materials is 1 to 50 wt.% of the product, an amount of the one or more gelation enhancers is 1 to 50 wt.% of the product, and an amount of the one or more hardening enhancers is 1 to 50 wt.% of the product; and wherein the product has an apparent density of 1200 kg/m 3 to 1800 kg/m 3 and a 28-day compressive strength of at least 17 MPa or 2500 psi. <EOS>