Abstract: An inorganic binder composition has a first constituent which is a poly(sialate) or a poly(sialate-siloxo) admixed with a second constituent which has one or more of: fly ash F, fly ash C, fumed silica, Al.sub.2 O.sub.3, pozzolan, ground slag, nephelene cyanite, anhydrous aluminum silicate, hydrous aluminum silicate, hydrous sodium hydroxide, silicic acid, potassium salt, and sodium salt.