Standard Test Method for
Microscopical Determination of Parameters of the Air-Void
System in Hardened Concrete1

This standard is issued under the fixed designation C 457; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (e) indicates an editorial change since the last revision or reapproval.

Click below to download Astm C 457 – 98Pdf free

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Click here to download Astm C 456 – 93 (Reapproved 2003)Pdf Free Download