초록 ▼

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

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.

대표청구항 ▼

A dry, hydratable concrete 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 being present in an amount of at

A dry, hydratable concrete 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 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 SiO2, Al2O3 and Fe2O3 present in said fly ash being less than about 80 percent by weight, said fly ash furthe not having been first treated to promote activity prior to incorporation in said concrete composition.