ASTM C494/C494M − 15 Standard Specification for Chemical Admixtures for Concrete

Scope of ASTM C494/C494M − 15 Standard Specification for Chemical Admixtures for Concrete

1.1 This specification covers materials for use as chemical admixtures to be added to hydraulic-cement concrete mixtures in the field for the purpose or purposes indicated for the eight types as follows:
1.1.1 Type A—Water-reducing admixtures,

1.1.2 Type B—Retarding admixtures,

1.1.3 Type C—Accelerating admixtures,

1.1.4 Type D—Water-reducing and retarding admixtures,

1.1.5 Type E—Water-reducing and accelerating admixtures,

1.1.6 Type F—Water-reducing, high range admixtures,

1.1.7 Type G—Water-reducing, high range, and retarding admixtures, and
1.1.8 Type S—Specific performance admixtures.

1.2 This specification stipulates tests of an admixture with suitable concreting materials as described in 11.1 –

11.3 or with cement, pozzolan, aggregates, and an air-entraining admixture proposed for specific work (11.4).

Unless specified otherwise by the purchaser, the tests shall be made using concreting materials as described in 11.1 – 11.3.

Terminology of ASTM C494/C494M − 15 Standard Specification for Chemical Admixtures for Concrete

3.1 Definitions:
3.1.1 accelerating admixture, n—an admixture that accelerates the setting and early strength development of concrete.

3.1.2 retarding admixture, n—an admixture that retards the setting of concrete.

3.1.3 water-reducing admixture, n—an admixture that reduces the quantity of mixing water required to produce concrete of a given consistency.

3.1.4 water-reducing admixture, high range, n—an admixture that reduces the quantity of mixing water required to produce concrete of a given consistency by 12 % or greater.