ASTM C295/C295M − 12 Standard Guide for Petrographic Examination of Aggregates for Concrete

Scope of ASTM C295/C295M − 12 Standard Guide for Petrographic Examination of Aggregates for Concrete

1.1 This guide outlines procedures for the petrographic examination of samples representative of materials proposed for use as aggregates in cementitious mixtures or as raw materials for use in production of such aggregates. This guide is based on Ref (1).2

1.2 This guide outlines the extent to which petrographic techniques should be used, the selection of properties that should be looked for, and the manner in which such techniques may be employed in the examination of samples of aggregates for concrete.

1.3 The rock and mineral names given in Descriptive Nomenclature C294 should be used, insofar as they are appropriate, in reports prepared in accordance with this guide.

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 may not be exact equivalents; therefore, each system shall be used independently of the other. Combining values from the two systems may result in non-conformance with the standard.

Significance and Use of ASTM C295/C295M − 12 Standard Guide for Petrographic Examination of Aggregates for Concrete

5.1 Petrographic examinations are made for the following purposes:

5.1.1 To determine the physical and chemical characteristics of the material that may be observed by petrographic methods and that have a bearing on the performance of the material in its intended use.

5.1.2 To describe and classify the constituents of the sample,