초록 ▼

An improved freeze/thaw characteristic is achieved in concrete by substituting crumb rubber for entrained air. The percent by volume of entrained air for concrete prescribed for a given set of freeze/thaw conditions is first determined then a predetermined quantity of crumb rubber is introduced into

An improved freeze/thaw characteristic is achieved in concrete by substituting crumb rubber for entrained air. The percent by volume of entrained air for concrete prescribed for a given set of freeze/thaw conditions is first determined then a predetermined quantity of crumb rubber is introduced into the mix in dependence on the percent of air entrained in the prescribed air entrained concrete.

대표청구항 ▼

1. A method of manufacturing a concrete for improved freeze/thaw characteristics including: a) determining the percentage entrained air in air entrained concrete prescribed for the temperature ranges to be encountered by the concrete being manufactured, and b) adding crumb rubber as a replacemen

1. A method of manufacturing a concrete for improved freeze/thaw characteristics including: a) determining the percentage entrained air in air entrained concrete prescribed for the temperature ranges to be encountered by the concrete being manufactured, and b) adding crumb rubber as a replacement of entrained air to a mix of cement, fly ash, water, sand and coarse aggregate in an amount per cubic yard of rubber concrete i) between 5 lbs. to 15 lbs., when the volume of air determined in step (a) is 3%, ii) between 8.33 lbs. to 18.33 lbs., when the volume of air determined in step (a) is 4%, iii) between 11.66 lbs. to 21.66 lbs., when the volume of air determined in step (a) is 5%, iv) between 15 lbs. to 25 lbs., when the volume of air determined in step (a) is 6%, v) between 18.33 lbs. to 28.33 lbs., when the volume of air determined in step (a) is 7%, and vi) between 22.66 lbs. to 31.66 lbs., when the volume of air determined in step (a) is 8%. 2. A method of manufacturing a concrete for improved freeze/thaw characteristics including: a) determining a volume of entrained air prescribed for improving freeze/thaw characteristics of a concrete for temperature conditions anticipated for the concrete in question; and b) adding to the concrete mix an amount of crumb rubber dependent on the volume of entrained air determined in step (a). 3. The method according to claim 2, wherein the volume of entrained air determined in step (a) is approximately 3%, and the amount of crumb rubber added in step (b) is substantially 5 lbs. to 15 lbs. per cubic yard of concrete. 4. The method according to claim 2, wherein the volume of entrained air determined in step (a) is approximately 4%, and the amount of crumb rubber added in step (b) is substantially 8.33 lbs. to 18.33 lbs. per cubic yard of concrete. 5. The method according to claim 2, wherein the volume of entrained air determined in step (a) is approximately 5%, and the amount of crumb rubber added in step (b) is substantially 11.66 lbs. to 21.66 lbs. per cubic yard of concrete. 6. The method according to claim 2, wherein the volume of entrained air determined in step (a) is approximately 6%, and the amount of crumb rubber added in step (b) is substantially 15 lbs. to 25 lbs. per cubic yard of concrete. 7. The method according to claim 2, wherein the volume of entrained air determined in step (a) is approximately 7%, and the amount of crumb rubber added in step (b) is substantially 18.33 lbs. to 28.33 lbs. per cubic yard of concrete. 8. The method according to claim 2, wherein the volume of entrained air determined in step (a) is approximately 8%, and the amount of crumb rubber added in step (b) is substantially 21.66 lbs. to 31.66 lbs. per cubic yard of concrete.