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ASTM C856-11
Standard Practice for Petrographic Examination of Hardened Concrete
STANDARD published on 1.4.2011
The information about the standard:
Designation standards: ASTM C856-11
Note: WITHDRAWN
Publication date standards: 1.4.2011
SKU: NS-15315
The number of pages: 17
Approximate weight : 51 g (0.11 lbs)
Country: American technical standard
Category: Technical standards ASTM
Annotation of standard text ASTM C856-11 :
Keywords:
aggregates, air voids, alkali-silica reaction, analysis, deterioration, examination, fire effects, hardened concrete, microscopy, paste, petrographic, secondary deposits, Fire testing--building materials, Hardened concrete, Microscopic examination--concrete, Petrographic analysis, Stereomicroscopy, Visual examination--concrete, Alkali reactivity, ICS Number Code 91.100.30 (Concrete and concrete products)
Additional information
| 1. Scope | ||||||||||||||||||||||||||||||||||
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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 1—A 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: |
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