ASTM C856/C856M-20 PDF Download
Standard EN Sample
Standard Practice for Petrographic Examination of Hardened Concrete
Also Known As:
Abstract
This practice outlines the standard procedures for performing petrographic examination of hardened concrete samples. The samples examined may be taken from concrete constructions, that is, all sorts of objects, units, or structures that have been built of hydraulic cement concrete. They may also be concrete products or portions thereof, or concrete or mortar specimens that have been exposed in natural environments or simulated service conditions, or subjected to laboratory tests. This practice applies to samples of all types of hardened hydraulic-cement mixtures, including concrete, mortar, grout, plaster, stucco, terrazzo, and the like. The equipments generally used for specimen preparation are diamond saw, cutting lubricant, horizontal lap wheels, free abrasive machine, polishing wheel, hot plate or oven, prospector's pick and/or bricklayer's hammer, abrasives, plate-glass squares, suitable media, and microscope slides. For specimen examination, the equipments needed are stereomicroscope, dollies, petrographic or polarizing microscope, metallographic microscope, eyepiece micrometer, stage micrometer, microscope lamps, needleholders and points, bottles with droppers, assorted forceps, lens paper, refractometer, and immersion media. Appropriate procedures for the sampling, preparation, and examination of specimens are detailed methodically.
This abstract is a brief summary of the referenced standard. It is informational only and not an official part of the standard; the full text of the standard itself must be referred to for its use and application. ASTM does not give any warranty express or implied or make any representation that the contents of this abstract are accurate, complete or up to date.
1. Scope
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.
1.2 The petrographic procedures outlined herein are applicable to the examination of samples of all types of hardened 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 The purposes of and procedures for petrographic examination of hardened concrete are given in the following sections:
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| Section |
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| Qualifications of Petrographers and Use of Technicians | 4 |
| Purposes of Examination | 5 |
| Apparatus | 6 |
| Selection and Use of Apparatus | 7 |
| Samples | 8 |
| Examination of Samples | 9 |
| Specimen Preparation | 10 |
| Visual and Stereomicroscope Examination | 11 |
| Polarizing Microscope Examination | 12 |
| Paste Features | 13 |
| Report | 14 |
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 are not necessarily exact equivalents; therefore, to ensure conformance with the standard, each system shall be used independently of the other, and values from the two systems shall not be combined.
Note 1: Sieve size is identified by its standard designation in Specification E11. The alternative designation given in parentheses is for information only and does not represent a different standard sieve size.
1.5 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use. A specific hazard statement is given in 6.2.10.1.
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.
| Descriptors | air voids, petrographic examination, concrete specimens, mortar specimens, construction materials, deterioration, alkali-silica reaction,Aggregates,Concrete Products,Hardened Concrete,Hydraulic Cement,Alkali-Aggregate Reaction,Building Products,Degradation/Deterioration,Microscopy,Petrography,Porosity,Test Specimens and Test Engines |
| ICS Codes | 91.100.30 - Concrete and concrete products |
| Language(s) | English |
| File Size | 184.3 KB |
