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 A8212;Water-reducing admixtures,
1.1.2 Type B8212;Retarding admixtures,
1.1.3 Type C8212;Accelerating admixtures,
1.1.4 Type D8212;Water-reducing and retarding admixtures,
1.1.5 Type E8212;Water-reducing and accelerating admixtures,
1.1.6 Type F8212;Water-reducing, high range admixtures,
1.1.7 Type G8212;Water-reducing, high range, and retarding admixtures, and
1.1.8 Type S8212;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.
Note 18212;It is recommended that, whenever practicable, tests be made using the cement, pozzolan, aggregates, air-entraining admixture, and the mixture proportions, batching sequence, and other physical conditions proposed for the specific work (11.4) because the specific effects produced by chemical admixtures may vary with the properties and proportions of the other ingredients of the concrete. For instance, Types F and G admixtures may exhibit much higher water reduction in concrete mixtures having higher cement factors than that listed in 12.1.1.
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