Pre-blend cement compositions containing non-chloride accelerators
OwnerRonald Barbourinventor
Life of this patent
Estimating the term…
Abstract
The present invention relates to pre-blend cement for general-purpose concrete construction containing Class-F fly ash, Class-C fly ash or slag, and less than about 5 percent (w/w) of sodium thiocyanate (NaSCN) and/or calcium nitrate (Ca(NO3)2), as a substantial replacement for cement. The sodium thiocyanate and/or calcium nitrate are additives for improved high early strength and accelerated setting times, thereby allowing the concrete structure to be put into service sooner, reducing labor cost, and allowing precast concrete and concrete masonry manufacturers to achieve rapid form and mold turnover.
Claims95
A pre-blend composition comprising cement and less than about 5 percent by weight based on the total composition of sodium thiocyanate, wherein the composition is substantially free of water, and has an initial setting time of greater than or equal to 45 minutes and a final setting time of less than or equal to 420 minutes when the composition is mixed with water.
A pre-blend composition comprising cement, slag, and less than about 5 percent by weight based on the total composition of sodium thiocyanate, wherein the composition is substantially free of water, and has an initial setting time of greater than or equal to 45 minutes and a final setting time of less than or equal to 420 minutes when the composition is mixed with water.
A pre-blend composition comprising cement, Class-F fly ash, and less than about 5 percent by weight based on the total composition of sodium thiocyanate, wherein the composition is substantially free of water, and has an initial setting time of greater than or equal to 45 minutes and a final setting time of less than or equal to 420 minutes when the composition is mixed with water.
A pre-blend composition comprising cement, Class-C fly ash, and less than about 5 percent by weight based on the total composition of sodium thiocyanate, wherein the composition is substantially free of water, and has an initial setting time of greater than or equal to 45 minutes and a final setting time of less than or equal to 420 minutes when the composition is mixed with water.
A pre-blend composition comprising cement, Class-C fly ash, Class-F fly ash, and less than about 5 percent by weight based on the total composition of sodium thiocyanate, wherein the composition is substantially free of water, and has an initial setting time of greater than or equal to 45 minutes and a final setting time of less than or equal to 420 minutes when the composition is mixed with water.
A pre-blend composition comprising cement and less than about 5 percent by weight based on the total composition of calcium nitrate, wherein the composition is substantially free of water, and has an initial setting time of greater than or equal to 45 minutes and a final setting time of less than or equal to 420 minutes when the composition is mixed with water.
A pre-blend composition comprising cement, slag, and less than about 5 percent by weight based on the total composition of calcium nitrate, wherein the composition is substantially free of water, and has an initial setting time of greater than or equal to 45 minutes and a final setting time of less than or equal to 420 minutes when the composition is mixed with water.
A pre-blend composition comprising cement, Class-F fly ash, and less than about 5 percent by weight based on the total composition of calcium nitrate, wherein the composition is substantially free of water, and has an initial setting time of greater than or equal to 45 minutes and a final setting time of less than or equal to 420 minutes when the composition is mixed with water.
A pre-blend composition comprising cement, Class-C fly ash, and less than about 5 percent by weight based on the total composition of calcium nitrate, wherein the composition is substantially free of water, and has an initial setting time of greater than or equal to 45 minutes and a final setting time of less than or equal to 420 minutes when the composition is mixed with water.
A pre-blend composition comprising cement, Class-C fly ash, Class-F fly ash, and less than about 5 percent by weight based on the total composition of calcium nitrate, wherein the composition is substantially free of water, and has an initial setting time of greater than or equal to 45 minutes and a final setting time of less than or equal to 420 minutes when the composition is mixed with water.
Dependencies are inferred from the claim text.