Standard : BS 1377:7, BS 1377:8, ASTM D4767, ASTM D2850, ASTM D7181, AASHTO T297
Triaxial test is a common method to determine the stress-strain characteristic and parameters of shear strength, mostly performed on undisturbed soil samples. The data is used for many soil engineering purposes such as ground, foundations, slope, excavations and embankments.
The test is mostly performed on cylindrical soil samples of Ø 38 mm to 150 mm, with height being twice its diameter. It is subjected to stress along its vertical axis while applying fluid pressure in perpendicular directions & deformations are recorded until failure.
Three common triaxial tests namely :
- Unconsolidated Undrained (UU)
- Consolidated Undrained (CU)
- Consolidated Drained (CD)
A) Triaxial Load Frame 10kN c/w Load Cell & Pressure Transducer
Precise CNC machined high-performance and advanced load frame which is heavy duty with rigid two columns design. Provides extremely stable & consistent loading during test. High accuracy microprocessor control system loading for precise speed control to perform tests within 0.00001 to 9.99999 mm/min. High quality luxury touch pad panel for ease of operation and long lasting use.
Main Features:
- Large easy to read LED screen display.
- Versatile high quality keypad.
- Connectable to datalogger for computer control, parameters display and analysis.
- Full variable speed setting from 0.00001 to 9.99999 mm/min.
- Adopt a silent and stable operation, ensures no vibration during test.
- Designed to perform dedicated Triaxial tests – UU, CU and CD.
- Ideal for research laboratories and advanced testing that require high quality tests and high repeatability.
- Built-in datalogger for connection to PC for test data logging.
Technical Specifications of Triaxial Load Frame
| Model Number |
NL 5019 X / 003 - P 001 |
| Capacity |
10 kN |
| Testing Speed |
0.00001 - 9.99999 mm/min |
| Max. Vertical Clearance |
600 mm |
| Horizontal Clearance |
215 mm |
| Platen Diameter |
185 mm |
| Max. Sample Size |
Ø 70 mm |
| Power |
220 ~ 240V, 1Ph, 50/60 Hz |
| Product Dimension (mm) |
390(W) x 270(D) x 925(H) |
| Approx. Weight |
36 kg |
Accessories for Triaxial Load Frame
| Model Number |
Parts Description |
| NL TLC – 10 |
10 kN Load Cell |
| NL PT – 2 kPa |
2000kPa Pressure Transducer with De-Airing Block (Pore Pressure) |
| NL DT – 3DP |
25 x 0.001 mm Digital Displacement Gauge c/w COM Cable |
B ) Pressure Volume Controller (PVC)
The Pressure Volume Controllers is very easy to use and an ideal solution for the most modern laboratories. When used with Test Master Loader, data loggers and software, they can be controlled from a computer to form part of a complete automated triaxial testing system. They may also be used as stad alone units which are fully functioning with or without computer control. All the devices has its own computer interface. The devices come complete with internal volume and pressure transducers. Both channel are pre-calibrated, it can generate pressures up to 2000kPa (20 bar) and provides a maximum volume measurement of 100ml which is readable to 0.001ml.
Features:
- Fitted with internal pressure transducer.
- Pressure can be ramped up or down at a selected rate in kPa per min.
- Pressure or volume can be set, and maintained, at either kPa or ml respectively.
- Max. Volume capacity of 60ml, readable to 0.001ml.
- Protected transducer configuration and calibration.
- Non-volatile storage of calibration and control parameters.
- Quiet operation.
- The advanced microprocessor controls screw pump for the precise regulation and measurement of fluid pressure and volume change. The fluid is de-aired water.
- The advanced microprocessor based electronics includes:
1) Fast 16bit A/D converter
2) Serial port for computer control
3) 240 x 128 LCD display
- Connection to PC for data logging via internal datalogger.
Technical Specification of Pressure Volume Controller
| Model Number |
NL 5019 X / 003 – P 002 |
| Max. Pressure |
2 Mp |
| Pressure Resolution |
1 kPa |
| Max. Volume |
75 ml |
| Volume Resolution |
0.01 ml |
| Cell Pressure |
Measuring Range : 0 ~ 2 MPa |
| |
Resolution : 1 kPa, Accuracy : +/- 1 kPa |
| Back Pressure |
Measuring Range : 0 ~ 2 MPa |
| |
Resolution : 1 kPa, Accuracy : +/- 1 kPa |
| Product Dimension |
760 (L) x 520 (W) x 310 (H) (mm) |
| Weight |
38 kg |
C) Triaxial Cell for Sample Size (Max. Ø38 mm)
Precisely made of high quality aluminium alloy & high resistant acrylic cell cylinder to withstand maximum pressure of 2000 kPa. Fitted with industrial grade quality on/off valves for cell pressure, back pressure & pore pressure hose connections. No tools required for dismantling & assembling the cell, as the clamping rods are tightened & loosen using hand knobs.
Technical Specification of Triaxial Cell
| Model Number |
NL 5019 X / 003 – P 003 |
| Max. Sample Size |
Ø 38 mm |
| Max. Pressure |
2000 kPa |
| Product Dimension |
376 (H) mm x Ø147 mm |
| Approx. Weight |
6 kg |
Accessories of Triaxial Testing Equipment
| Model Number |
Description |
| Base Adapter |
Base Adapter. Used to adapt the triaxial cell base for different sample sizes. |
| Top Cap |
Used to spread the load evenly over the whole cross-sectional area of the sample when drainage to the top of the sample is required. Includes a nylon tube and connector for the drainage line. |
| Porous Disc |
Acting as a filter to ensure the passage of water into and out of the sample evenly spread over the whole cross-sectional area. Two are required for the top and bottom of the sample. |
| Rubber Membrane |
To provide a protective waterproof barrier around the sample. Made of Rubber Latex and supplied in packs of 10. |
| O-ring |
Used to seal the membrane against the base adapter and the top cape of the sample. Supplied in a pack of 8. |
| Membrane Stretcher |
To stretch the membrane during its positioning. |
| Filter Paper for Drains |
Used as a side drain when specimens have low permeability. Very useful when saturating clays before consolidation and shearing. Supplied with pack of 50. |
| Spilt Former |
To prepare coarse-grain soil specimens. It is made of two aluminum halves. |
| O-ring Placing Tool |
Used for applying the O-ring with the minimum to the sample. |
| Split Mould |
Used for trimming the ends of undisturbed soil specimens. |
| Electrical Water Pump |
To pump water from the tank to the Triaxial Cell. |
| Rubber Teat |
To sucking for Membrane stretcher. |
| Filter Paper for Base |
Used only for specimens of very low permeability soil to reduce the maximum length of drainage path of a distance equal to the specimen radius. |
| De-Airing Water Tank (with Mounting Bracket) |
Used for water storage. |
| Nylon Tubing M6 |
For vacuum (5 meter / roll) |
| Oil Free Vacuum Pump |
Supply comes with Regulator |
How to Operate Advanced Triaxial Testing Machines
