Abstract: Additive compositions for Portland cement compositions are disclosed which provide the corrosion inhibition of calcium nitrite without the corresponding set acceleration. The additive compositions are stable, single phase aqueous solutions consisting essentially of water and, as solutes, a major amount by weight of calcium nitrite and a minor amount by weight of corn syrup, a hydroxycarboxylic acid, or an alkali metal or alkaline earth metal salt of a hydroxycarboxylic acid.

Abstract: Concretes containing a hydratable cementitious binder such as Portland cement and a high strength aggregate material are described. The high strength aggregate material is produced from hydrated cementitious compositions which contain relatively low proportions of Portland cement and relatively high proportions of a select fly ash component. The high strength aggregate material is produced by mixing the aforementioned Portland cement and fly ash components with water and allowing such to hydrate. The hydrated aggregate product may then be reduced in size (e.g. by crushing) and screened prior to combination with the cementitious binder to produce concrete compositions. Concretes can be prepared with such aggregate which have at least comparable compressive strengths to concrete prepared using conventional crushed stone aggregate.

Abstract: An admixture for Portland cement compositions and particularly Portland cement concrete compositions which contain pozzolans such as fly ash and blast furnace slag is described which is a mixture containing at least three specified chemical ingredients. The admixture improves the strength and other properties of the compositions.

Abstract: Concretes containing Portland cement, fly ash and aggregate are disclosed which are capable of attaining high compressive strength and which contain relatively low proportions of Portland cement and relatively high proportions of a select fly ash component. The inventive concretes may be formulated as highly dense masses particularly suited for use in the manner of conventional structural concretes in buildings, bridges, dams, etc. Comparatively low density concrete masses may also be produced which are light in weight and have thermal insulation value rendering them particularly suited for use as thermal insulating components of roofs and as protective coatings for a variety of substrates.