Petrography
Aggregate Petrography – ASTM C295 is the standard guide for petrographic examination of aggregates for concrete.
Our experienced team of professional geologists, petrographers and professional engineers evaluate the aggregate (coarse and fine) in accordance with ASTM C295. These methods determine the physical and chemical characteristics of the material and that have a bearing on the performance of the material in its intended use.
Evaluations can involve visual and microscopic examination of carefully selected representative aggregate particles. Thin sections are examined at high magnifications with polarized light microscopes (PLM) to determine the following aggregate properties:
- Alkali-Silica Reactivity (ASR) Potential
- Alkali-Carbonate Reactivity (ACR) Potential
- Aggregate Lithology (Rock Type)
- Durability
- Staining Potential
- Rock Core Petrography
- Quarry Approvals
- Mica Content
- Quality
- Water Demand Effects
- Pyrrhotite Content
Key findings can answer questions like:
- Can my aggregate be safely used in concrete?
- Will this aggregate cause staining or pop outs?
- Could this aggregate cause the same problems seen in the deteriorating home foundations in Connecticut?
Experience
- Quarry Approvals
- Rock Core Evaluations
- Alkali Aggregate Reactions
- Mica Content
For information on our petrography services contact an expert or download our handout on aggregate testing.
