A process for producing an article of an aerated composite material, comprising: forming a wet mixture, wherein the wet mixture comprises: water, a ground calcium silicate, comprising one or more of synthetic wollastonite, pseudo-wollastonite, rankinite, gehlenite, belite, and alite, having a specific particle size, d 10 in the range from 0.25 μm to 5 μm, d 50 in the range from 5 μm to 20 μm, and d 90 in the range of 25 μm to 100 μm, filler particles comprising calcium oxide or silica having a particle size (dso) in the range from 0.25 μm to 200 μm, and an aerating agent, casting the wet mixture in a mold; allowing the aerating agent to generate a gaseous product thereby causing volume expansion of the wet mixture; pre-curing the expanded mixture under a pressure ranging from ambient atmospheric pressure to 206,843 N/m 2 (30 psi) at a temperature in the range from 20°C to 80°C, under an atmosphere of water and CO 2 , under a CO 2 concentration ranging from 25% to 99.5%, and for 1 hour to 10 hours; de-molding and/or cutting the pre-cured object to desired dimensions; and further curing the de-molded and/or cut pre-cured object under a pressure ranging from ambient atmospheric pressure to 206,843 N/m 2 (30 psi) above ambient, at a temperature in the range from 20°C to 80°C for 5 hours to 40 hours under an atmosphere of water vapor and CO 2 , under a relative humidity ranging from 50 to 98%, to yield the article. forming a wet mixture, wherein the wet mixture comprises: water, a ground calcium silicate, comprising one or more of synthetic wollastonite, pseudo-wollastonite, rankinite, gehlenite, belite, and alite, having a specific particle size, d 10 in the range from 0.25 μm to 5 μm, d 50 in the range from 5 μm to 20 μm, and d 90 in the range of 25 μm to 100 μm, filler particles comprising calcium oxide or silica having a particle size (dso) in the range from 0.25 μm to 200 μm, and an aerating agent, water, a ground calcium silicate, comprising one or more of synthetic wollastonite, pseudo-wollastonite, rankinite, gehlenite, belite, and alite, having a specific particle size, d 10 in the range from 0.25 μm to 5 μm, d 50 in the range from 5 μm to 20 μm, and d 90 in the range of 25 μm to 100 μm, filler particles comprising calcium oxide or silica having a particle size (dso) in the range from 0.25 μm to 200 μm, and an aerating agent, casting the wet mixture in a mold; allowing the aerating agent to generate a gaseous product thereby causing volume expansion of the wet mixture; pre-curing the expanded mixture under a pressure ranging from ambient atmospheric pressure to 206,843 N/m 2 (30 psi) at a temperature in the range from 20°C to 80°C, under an atmosphere of water and CO 2 , under a CO 2 concentration ranging from 25% to 99.5%, and for 1 hour to 10 hours; de-molding and/or cutting the pre-cured object to desired dimensions; and further curing the de-molded and/or cut pre-cured object under a pressure ranging from ambient atmospheric pressure to 206,843 N/m 2 (30 psi) above ambient, at a temperature in the range from 20°C to 80°C for 5 hours to 40 hours under an atmosphere of water vapor and CO 2 , under a relative humidity ranging from 50 to 98%, to yield the article. <EOS>