| Test Description | Minimum Sample Requirements |
| Rock Testing – (ISRM and Australian Standards) | |
| Unconfined Compression Testing / Sound Velocity Testing | L/D ≥ 2.5 (min.) |
| Hoek Triaxial Testing | L/D ≥ 2 (min.) |
| Direct Shear Testing ‘ Saw Cut’ / Reverse Shear (Rock Joints) | Length > 50mm |
| Direct Shear Testing / Reverse Shear (Intact Rock) | Length > 50mm (sample must have distinct bedding orientation) |
| Indirect Tensile Strength (Brazilian) | Length > 0.5 x Diameter |
| AE/DRA Testing |
Max. 4 breaks per meter of core with preferably minimal structures / Min. NQ size / core require at least 0.5 - 1 metre for one set of Full Stress Tensor Measurement / Dip/Ori of borehole |
| Test Description | Minimum Sample Requirements |
| Soil Testing (Australian Standards & ASTM) | |
| Atterberg Limits / Classification of Soils | Clay: 250g & Sandy Clay: 350g |
| Grain Size Distribution | Clay: 300g & Sand: 500g |
| CU, CD & UU Triaxial Testing | Length > 2 x Diameter |
| True Triaxial Testing | Length > 60mm & Diameter > 50mm (min.) |
| Direct Shear Testing / Reverse Shear | Length > 50mm |
| Unsaturated Soil/Pastefill Testing | Please discuss with Lab Geotech |
| Ring Test | Length > 50mm & Diameter > 60mm (or 1200g) |
*L = Length, D = Diameter
Notes:
Destroyed soil/clay samples can be re-invented to in-situ conditions and tested (K0 or Ka Consolidation Applies)
Core Size Capabilities (diameter):
NQ - 50.6mm
NX - 54.0mm
NTW - 56.0mm
HQ - 63.5mm & (HQ3)
PQ - 85.0mm & (PQ3)
Protection against Moisture Loss & Damage during Transportation
To prevent moisture loss, seal rock and soil/clay samples in air-tight plastic wraps. Apply a second layer of aluminium foil around the outside of the plastic wrap. Cover the wrapped sample with another layer of
bubble wrap, or a material that can withstand some external impact. Typically samples are then placed in a PVC split and placed in core tray one size up to accommodate the wrapped core. Please ensure that
samples are placed in a cool area away from direct sunlight.
Labelling Samples
In order to effectively gather the correct data and save valuable time, the following procedure is recommended for labelling samples:
Test Turn-around and Scheduling
E-Precision Laboratory takes into consideration the need for accurate and reliable results that is not compromised by an extended turn-around time delaying schedules for the client. Hence, all testing projects received typically have results delivered to the client within one to four (1-4) weeks of receiving the official documentation indicating what test/tests are required on each sample; or otherwise a time-frame pre-agreed to with the client.
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