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ASTM C295, Petrographic Examination of Aggregates for Concrete

ASTM C295 is one component of a testing program to assess the suitability of an aggregate for use in concrete. It can be performed in conjunction with tests listed in ASTM C33, Specification for Concrete Aggregates, or conducted independently as an indicator of general aggregate quality. Related tests often performed in conjunction with ASTM C295 include petrographic number (PN), scratch hardness, and percentage of flat and elongated particles.

The test is performed on:

  • Natural sand
  • Natural gravel
  • Manufactured aggregate of all sizes
  • Crushed and partially crushed stone
  • Drilled rock core
  • Ledge rock

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