ASTM C856 PDF

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 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. The alternative designation given in parentheses is for information only and does not represent a different standard sieve size. 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.

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Historical Version s - view previous versions of standard. More C 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. 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.

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. Qualifications of Petrographers and Use of Technicians. 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.

The alternative designation given in parentheses is for information only and does not represent a different standard sieve size. 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. Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard. Scope 1. Purposes of Examination. Selection and Use of Apparatus. Examination of Samples. Specimen Preparation. Visual and Stereomicroscope Examination.

Polarizing Microscope Examination. Paste Features. Link to Active This link will always route to the current Active version of the standard.

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Petrographic examination is performed to assess concrete condition and problems related to concrete structures, construction materials, concrete placement, and service. Cores from structures of all types and sizes are routinely examined by our petrographers. Precast concrete products of all types are examined to assess quality, condition, and causes of distress. Our petrographers have a broad background across the spectrum of specialties in geology and materials science. With more than a century of combined experience in applied petrography, our level of expertise is unmatched. Collectively, we have performed thousands of examinations on concrete.

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Historical Version s - view previous versions of standard. More C 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.

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Active view current version of standard. Other Historical Standards. Work Item s - proposed revisions of this standard. More C 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. It is a requirement that the substances in those locations must be identified using any other more definitive techniques, such as petrographic microscopy.

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