ASTM-C457 Standard Test Method for Microscopical Determination of Parameters of the Air-Void System in Hardened Concrete

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1.1 This test method describes procedures for microscopical determinations of the air content of hardened concrete and of the specific surface, void frequency, spacing factor, and paste-air ratio of the air-void system in hardened concrete (1). Two procedures are described:

1.1.1 Procedure A , the linear-traverse method (2, 3).

1.1.2 Procedure B , the modified point-count method (3, 4, 5, 6).

1.2 This test method is based on prescribed procedures that are applied to sawed and lapped sections of specimens of concrete from the field or laboratory.

1.3 It is intended to outline the principles of this test method and to establish standards for its adequate performance but not to describe in detail all the possible variations that might be used to accomplish the objectives of this test method.

1.4 The values stated in inch-pound units are to be regarded as the standard.

1.5 This standard does not purport to address all of the safety problems associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use. For specific hazard statements see Notes 3 and 6.


Air content; Air voids; Concrete-air content; Concrete-hardened; Linear traverse (Rosiwal) method; Microscopic examination-concrete; Modified point-count method; Petrographic analysis; Pore structure; air-void content/parameters of air-void system in hardened concrete, by; microscopical determination, test,; Spacing factor; Surface analysis-concrete; air-void content (in hardened concrete), test; ICS Number Code 91.100.30 (Concrete and concrete products)

To find similar documents by ASTM Volume:

04.02 (Concrete and Aggregates)

To find similar documents by classification:

91.100.30 (Concrete and concrete products Including admixtures)

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Publication Date

March 17, 2023

Document Type

Test Method

Page Count

17 pages

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