Aggregate, Soil & Geotechnical Laboratory Testing
Geotechnical laboratory testing classifies soils and aggregates and measures the properties designs rely on: compaction behaviour, shear strength, consolidation, permeability and aggregate durability. Field density tests verify that placement matches the laboratory reference.
What does it measure?
- Compaction characteristics — maximum dry density and optimum moisture (ASTM D1557 / D698)
- Particle size distribution of soils and aggregates (ASTM C136 / D6913)
- Atterberg limits and soil classification
- Shear strength (direct shear, triaxial), consolidation and permeability
- Aggregate soundness, abrasion (Los Angeles) and specific gravity
When is it used?
- Foundation, embankment and earthworks design and verification
- Qualifying borrow material and aggregates for concrete or pavement
- Investigating settlement, slope movement or pavement distress
- Compaction control references for field density testing
Sample considerations
- Disturbed versus undisturbed samples answer different questions — say which you can provide.
- Record sampling depth, location and moisture condition; chain of custody matters for contaminated sites.
Laboratories with relevant capabilities
- Eurofins Agro (Wageningen, Gelderland) — Agricultural Testing, Chemical Analysis, Elemental Analysis
- Chemtech-Ford Laboratories (Sandy, UT) — Environmental Testing, Water Testing, Soil Testing
Frequently asked questions
- What is the difference between standard and modified Proctor?
- They use different compaction energy (ASTM D698 versus D1557), producing different maximum dry densities. The project specification states which applies.
Confirm standard edition, jurisdiction and actual laboratory scope. Service references are not partnerships or endorsements.