ASTM C295 – Standard Guide for Petrographic Examination of Aggregates for Concrete
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 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.