Abstract: This invention is directed to a composite material of one or more preformed reinforcement materials co-influencing the final shape and made of tension-resistant organic and/or inorganic material, a second material of alkali water glass and a finely disperse mineralic filler, with hardening having been effected by drying at 80.degree. to 120.degree. C., or by drying at 80.degree. to 120.degree. C. and subsequent tempering at 400.degree. to 700.degree. C. The process for producing said composite material and its use as a fire-proof, bending tension-resistant construction element formed as desired is disclosed.