Abstract: A method and apparatus for rapidly manufacturing concrete or like products having an advanced state of cure by blending together a calcareous cementitious binder, aggregate, and water to form a mix, molding the mixture to have a predetermined shape and exposing the shape to an atmosphere in a chamber consisting essentially of carbon dioxide gas, wherein carbon dioxide gas is fed under controlled conditions into said chamber through a series of tubes having a multiplicity of spaced orifices during the movement of the shape therein and continuing the feed so as to cause an exothermic temperature rise in the shape.

Abstract: A method and apparatus for rapidly manufacturing concrete or like poducts having an advanced state of cure by blending together a calcareous cementitious binder, aggregate, and water to form a mix, molding the mixture to have a predetermined shape and exposing the shape to an atmosphere in a chambr consisting essentially of carbon dioxide gas, wherein ultracold carbon dioxide gas is fed to said chamber during the movement of the shape therein and continuing the feed so as to cause an exothermic temperature rise in the shape.

Abstract: A concrete mix which comprises solids in the amount of:(a) 5-25% by weight of a calcareous cementitious binder;(b) 50-70% by weight of a coarse aggregate having a particle size in a range of about 3/8" to larger than 30 mesh, and(c) 25-35% by weight of a fine aggregate having a particle size in a range of about 100-pan mesh, andwater, said mix being substantially free of aggregate having a particle size in the range of 30-50 mesh.