ASTM-C856 2011

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C856-11 Standard Practice for Petrographic Examination of Hardened Concrete

Published By	Publication Date	Number of Pages
ASTM	2011	17

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Categories: 91.100.30 - Concrete and concrete products, ASTM

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Description

1.1 This practice outlines procedures for the petrographic examination of samples of hardened concrete. The samples examined may be taken from concrete constructions, they may be concrete products or portions thereof, or they may be concrete or mortar specimens that have been exposed in natural environments, or to simulated service conditions, or subjected to laboratory tests. The phrase concrete constructions is intended to include all sorts of objects, units, or structures that have been built of hydraulic cement concrete.

Note 1A photographic chart of materials, phenomena, and reaction products discussed in Sections 8-13 and Tables 1-6 are available as Adjunct C856 (ADJCO856) .

1.2 The petrographic procedures outlined herein are applicable to the examination of samples of all types of hardened hydraulic-cement mixtures, including concrete, mortar, grout, plaster, stucco, terrazzo, and the like. In this practice, the material for examination is designated as concrete, even though the commentary may be applicable to the other mixtures, unless the reference is specifically to media other than concrete.

1.3 Annex A1 outlines an uranyl acetate method for identifying locations where alkali-silica gel may be present. It is a requirement that the substances in those locations must be identified using any other more definitive techniques, such as petrographic microscopy.

1.4 The purposes of and procedures for petrographic examination of hardened concrete are given in the following sections:

PDF Catalog

PDF Pages	PDF Title
1	Scope Referenced Documents
2	Terminology Qualifications of Petrographers and Use of Technicians TABLE 1
3	Purposes of Examination TABLE 2
4	TABLE 3
5	TABLE 4
6	Apparatus TABLE 5
7	TABLE 6
8	Selection and Use of Apparatus Samples
9	Examination of Samples
10	Specimen Preparation
11	Visual and Stereomicroscope Examination
12	Petrographic Microscope Examination
13	Paste Features Report Keywords
14	A1. A TECHNIQUE FOR DETECTING ALKALI-SILICA GEL SUBJECT TO CONFIRMATION BY OTHER METHODS A1.1 Scope A1.2 Cautions A1.3 Qualification A1.4 Apparatus, Reagents, and Materials
15	A1.5 Specimens A1.6 Conditioning and Pre-Screening Procedure A1.7 Uranyl-Acetate Treatment Procedure: A1.8 Ultraviolet Exposure of Treated Surface A1.9 Identification of Alkali-Silica Gel
16	REFERENCES

Additional information

Standard Title	C856-11 Standard Practice for Petrographic Examination of Hardened Concrete
Published Code	ASTM
Publication Date	2011
Pages Count	17
ICS Codes	91.100.30 - Concrete and concrete products

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ASTM-C856 2011

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