ASTM C295
Full Name
ASTM C295 – Standard Guide for Petrographic Examination of Aggregates for Concrete
Scope
ASTM C295 outlines procedures for the petrographic examination of samples that are representative of materials intended for use as aggregates in cementitious mixtures or as raw materials for such aggregates.
The scope of ASTM C295 includes:
- Examination procedures: provides guidelines on the extent to which petrographic techniques should be used, the selection of properties to be examined, and the manner in which these techniques are employed.
- Identification of constituents: outlines procedures for identifying and classifying the rock and mineral constituents present in aggregate samples.
- Evaluation of properties: guides the assessment of physical and chemical properties that may affect the performance of aggregates in concrete, such as durability, reactivity, and soundness.
- Identification of potentially harmful constituents: helps in identifying potentially harmful constituents, like unstable minerals, deleterious substances, and alkali-reactive materials.
- Recommendations for further testing: suggests additional tests to confirm or refute the presence of harmful constituents.
ASTM C295 does not cover:
- Specific acceptance criteria: the guide doesn’t provide specific limits for the acceptable amounts of various constituents in aggregates. These limits are typically established in project specifications or other standards.
- Testing methods: the guide focuses on the petrographic examination and doesn’t detail the specific methods for other tests that might be recommended.
Overall, ASTM C295 is a valuable resource for petrographers, engineers, and other professionals involved in the selection and evaluation of aggregates for concrete. It helps ensure the quality and suitability of aggregates, leading to durable and high-performing concrete structures.
ASTM C295 Accredited Laboratory
Applied Testing & Geosciences, LLC is accredited for performing tests using the ASTM C295 standard.
Contact us for more information.
Resources
Keywords
petrographic examination; aggregates; concrete; rock; mineral; durability; reactivity; alkali-silica reactivity; deleterious substances