ASTM-C457 2009

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C457-09 Standard Test Method for Microscopical Determination of Parameters of the Air-Void System in Hardened Concrete

Published By	Publication Date	Number of Pages
ASTM	2009	15

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Categories: 91.100.30 - Concrete and concrete products, ASTM

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Description

ASTM C457-09

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

ASTM C457

Scope

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 standard. The values given in parentheses are mathematical conversions to inch-pound units that are provided for information only and are not considered 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 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/C0457-09

PDF Catalog

PDF Pages	PDF Title
1	Scope Referenced Documents Terminology
2	Summary of Test Method Significance and Use
3	Apparatus and Materials for Sample Preparation (for either procedure) Sampling (for either procedure) Preparation of Sections (for either procedure) TABLE 1
4	FIG. 1
5	Apparatus for Measurement of Specimens Procedure
6	FIG. 2
7	Calculation FIG. 3 TABLE 2
8	Apparatus for Measurement of Specimens Procedure
9	Calculation FIG. 4
10	FIG. 5
11	Report Precision and Bias TABLE 3
12	Keywords TABLE 4 TABLE 5 TABLE 6
13	X1. Interpretation of Results X1.1 X1.2 X1.3 X1.4 X1.5 X1.6 TABLE 7
14	X1.7 REFERENCES

Additional information

Standard Title	C457-09 Standard Test Method for Microscopical Determination of Parameters of the Air-Void System in Hardened Concrete
Published Code	ASTM
Publication Date	2009
Pages Count	15
ICS Codes	91.100.30 - Concrete and concrete products