ASTM C856 − 14 Standard Practice for Petrographic Examination of Hardened Concrete

ASTM C856 − 14 Standard Practice for Petrographic Examination of Hardened Concrete

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.

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.

ASTM C856 − 14 Standard Practice for Petrographic Examination of Hardened Concrete

Qualifications of Petrographers and Use of Technicians

4.1 All petrographic examinations of hardened concrete described in this practice shall be performed by or under the technical direction of a full time supervising petrographer with at least 5 years’ experience in petrographic examinations of concrete and concrete-making materials.