Patent ID: 6695909
Filing Date: 2004-02-24
Classification: C04B,Y02W

Abstract:
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%.