Portland cement-fly ash-aggregate concretes

A hydrated structural concrete mass having a density greater than about 70 pounds per cubic foot produced from the addition of water to a mixture comprised of Portland cement, fly ash and particulate aggregate having a density greater than about 40 pounds per cubic foot, said aggregate being present in an amount greater than about 50 percent by volume of the total volume of the hydrated mass, said cement and said fly ash being present in a weight ratio of from 1 part cement to at least about 1 part fly ash, said fly ash upon analysis having a total calcium oxide content greater than about 10 percent by weight, the total additive amount of SiO.sub.2, Al.sub.2 O.sub.3 and Fe.sub.2 O.sub.3 present in said fly ash being less than about 80 percent by weight, said fly ash further not having been first treated to promote activity prior to incorporation in said mixture.

A dry, hydratable concrete composition comprising a mixture of Portland cement and fly ash, and, in addition, lightweight aggregate in particulate form, said Portland cement and fly ash being present in a weight ratio of from 1 part cement to at least 1 part ash, said aggregate having a dry bulk density of less than about 15 pounds per cubic foot and being present in an amount of at least 50 percent by volume of the total volume of the composition, said fly ash upon analysis having a total calcium oxide content greater than about 10 percent by weight, the total additive amount of SiO.sub.2, Al.sub.2 O.sub.3 and Fe.sub.2 O.sub.3 present in said fly ash being less than about 80 percent by weight, said fly ash further not having been first treated to promote activity prior to incorporation in said concrete composition.

A hydrated lightweight porous concrete mass having a density less than about 70 pounds per cubic foot, produced from the addition of water to a mixture comprised of Portland cement, fly ash and particulate aggregate having a density of less than about 15 pounds per cubic foot, said aggregate being present in an amount greater than about 50 percent by volume of the total volume of the hydrated mass, said cement and said fly ash being present in a weight ratio of from 1 part cement to at least about 1 part fly ash, said fly ash upon analysis having a total calcium oxide content greater than about 10 percent by weight, the total additive amount of SiO.sub.2, Al.sub.2 O.sub.3 and Fe.sub.2 O.sub.3 present in said fly ash being less than about 80 percent by weight, said fly ash further not having been first treated to promote activity prior to incorporation in said mixture.

A dry, hydratable structural concrete composition capable upon admixture with water of hardening into a solid mass having a density greater than 70 pounds per cubic foot, said composition comprising a mixture of Portland cement and fly ash, and, in addition, aggregate in particulate form, said Portland cement and fly ash being present in a weight ratio of from 1 part cement to at least 1 part ash, said aggregate having a dry bulk density greater than about 80 pounds per cubic foot and being comprised of a mixture of a coarse aggregate having a particulate size greater than about 3/8 of an inch and a fine aggregate having a particulate size less than about 3/8 of an inch, said aggregate being present in an amount of at least 50 percent by volume of the total volume of the composition, said fly ash upon analysis having a total calcium oxide content greater than about 10 percent by weight, the total additive amount of SiO.sub.2, Al.sub.2 O.sub.3 and Fe.sub.2 O.sub.3 present in said fly ash being less than about 80 percent by weight, said fly ash further not having been first treated to promote activity prior to incorporation in said concrete composition.

A dry hydratable lightweight concrete composition capable upon admixture with water of hardening into a solid mass having a density less than about 70 pounds per cubic foot, said composition comprising a mixture of Portland, fly ash, surface active agent and lightweight particulate aggregate having a density less than about 15 pounds per cubic foot, said cement and said fly ash being present in a weight ratio of from 1 part cement to at least about 1 part fly ash, said fly ash upon analysis having a total calcium oxide content greater than about 10 percent by weight, the total additive amount of SiO.sub.2, Al.sub.2 O.sub.3 and Fe.sub.2 O.sub.3 present in said fly ash being less than about 80 percent by weight, said surface active agent being present in the composition in an amount sufficient to entrain air in the composition upon admixture with water, said fly ash further not having been first treated to promote activity prior to incorporation in said concrete composition.