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About This Item
Full Description
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. Three procedures are described:
1.1.1 Procedure A-Linear-traverse method.
1.1.2 Procedure B-Modified point-count method.
1.1.3 Procedure C-Contrast enhanced method.
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 either SI units or inch-pound units are to be regarded separately as standard. The values stated in each system may not be exact equivalents; therefore, each system shall be used independently of the other. Combining values from the two systems may result in non-conformance with the standard.
1.5 This standard does not purport to address all of the safety concerns 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 Note 9 and Note 12.
1.6 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
Document History
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ASTM C457/C457M-24
Standard Test Method for Microscopical Determination of Parameters of the Air-Void System in Hardened Concrete- Most Recent
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ASTM C457/C457M-23a
Standard Test Method for Microscopical Determination of Parameters of the Air-Void System in Hardened Concrete- Historical Version
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ASTM C457/C457M-23
Standard Test Method for Microscopical Determination of Parameters of the Air-Void System in Hardened Concrete- Historical Version
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ASTM C457/C457M-16
viewing
Standard Test Method for Microscopical Determination of Parameters of the Air-Void System in Hardened Concrete- Historical Version
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ASTM C457/C457M-12
Standard Test Method for Microscopical Determination of Parameters of the Air-Void System in Hardened Concrete- Historical Version
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ASTM C457/C457M-11
Standard Test Method for Microscopical Determination of Parameters of the Air-Void System in Hardened Concrete- Historical Version
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ASTM C457/C457M-10a
Standard Test Method for Microscopical Determination of Parameters of the Air-Void System in Hardened Concrete- Historical Version
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ASTM C457/C457M-10
Standard Test Method for Microscopical Determination of Parameters of the Air-Void System in Hardened Concrete- Historical Version
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ASTM C457-09
Standard Test Method for Microscopical Determination of Parameters of the Air-Void System in Hardened Concrete- Historical Version
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ASTM C457-08d
Standard Test Method for Microscopical Determination of Parameters of the Air-Void System in Hardened Concrete- Historical Version
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ASTM C457-08c
Standard Test Method for Microscopical Determination of Parameters of the Air-Void System in Hardened Concrete- Historical Version
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ASTM C457-08b
Standard Test Method for Microscopical Determination of Parameters of the Air-Void System in Hardened Concrete- Historical Version
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ASTM C457-08a
Standard Test Method for Microscopical Determination of Parameters of the Air-Void System in Hardened Concrete- Historical Version
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ASTM C457-08
Standard Test Method for Microscopical Determination of Parameters of the Air-Void System in Hardened Concrete- Historical Version
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ASTM C457-06
Standard Test Method for Microscopical Determination of Parameters of the Air-Void System in Hardened Concrete- Historical Version
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ASTM C457-98
Standard Test Method for Microscopical Determination of Parameters of the Air-Void System in Hardened Concrete- Historical Version