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Description of ASTM-C457 2008ASTM C457-08Historical Standard: Standard Test Method for Microscopical Determination of Parameters of the Air-Void System in Hardened ConcreteASTM C457Scope 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 SI units are to be regarded as the standard. The values in parentheses are provided for information purposes only.
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 8.3 and
10.1. Keywords air content; air void parameters of hardened concrete; area-prepared surface required; average chord-length of voids; determination of air-void parameters; entrained void; entrapped void; grits for lapping hardened concrete; index point; lapping; length of traverse required; linear-traverse method; microscopical; number of points required; paste-air ratio; paste-air ratio modification; paste content; point-count method (modified); sample preparation for microscopical analysis; spacing factor; specific surface; void frequency; water void; Air content--concrete; Air voids; Hardened concrete; Linear traverse (Rosiwal) method; Microscopic examination--concrete; Modified point-count method; Petrographic analysis; Pore structure; Spacing factor; Surface analysis--concrete ICS Code ICS Number Code 91.100.30 (Concrete and concrete products) DOI: 10.1520/C0457-08 The following editions for this book are also available...
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About ASTMASTM International, formerly known as the American Society for Testing and Materials (ASTM), is a globally recognized leader in the development and delivery of international voluntary consensus standards. Today, some 12,000 ASTM standards are used around the world to improve product quality, enhance safety, facilitate market access and trade, and build consumer confidence. ASTM’s leadership in international standards development is driven by the contributions of its members: more than 30,000 of the world’s top technical experts and business professionals representing 150 countries. Working in an open and transparent process and using ASTM’s advanced electronic infrastructure, ASTM members deliver the test methods, specifications, guides, and practices that support industries and governments worldwide. |
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