Concrete Admixtures
Using Admixtures in Concrete Mix Design
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Concrete Admixtures - ASTM Categories

ASTM C494 specifies the requirements for seven chemical admixture types. They are:

  • Type A: Water-reducing admixtures
  • Type B: Retarding admixtures
  • Type C: Accelerating admixtures
  • Type D: Water-reducing and retarding admixtures
  • Type E: Water-reducing and accelerating admixtures
  • Type F: Water-reducing, high range admixtures
  • Type G: Water-reducing, high range, and retarding admixtures

Note: Changes occur in the admixture industry faster than the ASTM consensus process. Shrinkage Reducing Admixtures (SRA) and Mid-Range Water Reducers (MRWD) are two areas for which no ASTM C494-98 specifications currently exist.

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