ASTM-C457 1998

$44.96

C457-98 Standard Test Method for Microscopical Determination of Parameters of the Air-Void System in Hardened Concrete

Published By	Publication Date	Number of Pages
ASTM	1998	14

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Categories: 91.100.30 - Concrete and concrete products, ASTM

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Description

ASTM C457-98

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 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.

Keywords

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 Code

ICS Number Code 91.100.30 (Concrete and concrete products)

DOI: 10.1520/C0457-98

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	Apparatus for Measurement of Specimens
5	FIG. 1
6	Procedure FIG. 2
7	FIG. 3 TABLE 2
8	Calculation Apparatus for Measurement of Specimens
9	Procedure FIG. 4
10	FIG. 5
11	Calculation TABLE 3
12	Report Precision and Bias TABLE 4 TABLE 5
13	Keywords REFERENCES TABLE 6 TABLE 7

Additional information

Standard Title	C457-98 Standard Test Method for Microscopical Determination of Parameters of the Air-Void System in Hardened Concrete
Published Code	ASTM
Publication Date	1998
Pages Count	14
ICS Codes	91.100.30 - Concrete and concrete products