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Utest Material Testing Equipment

Triaxial UU Test Systems

Product Code

Triaxial Test Systems,    220-240 V 50-60 Hz

Standards

ASTM D2850, D4767, D7181; AASHTO T-297; BS 1377-7, BS 1377-8

Determining the mechanical properties of soils is a very important step to design foundations,

embankments and other soil structures. Building constructions, excavations, tunnelling and similar applications have several effects on the subsoil structures and these effects are successfully simulated with Triaxial Tests where the stress-strain relation of undisturbed soil specimen are investigated by subjecting the soil sample to different stress levels and drainage conditions.

The UTEST Triaxial Test System provides automated triaxial compression tests on cylindrical undisturbed and remolded soil samples. Unconsolidated undrained (UU), consolidated drained (CD) and consolidated undrained (CU) compression tests can be automatically run, controlled and reported using this apparatus.

Unconsolidated Undrained (UU) Test

For the UU test , the specimens (assumed to be saturated prior to test) are subjected to a confining fluid pressure in a triaxial chamber. Once the specimen is inside the triaxial cell, the cell pressure is increased to a predetermined value by rotating the knob, and the specimen is brought to failure by increasing the vertical stress by applying a constant rate of axial strain. Saturation and consolidation are not permitted to keep the original structure and water content of sample untouched. Pore pressures are not measured during this test and therefore the results can only be interpreted in terms of total stress. These tests are generally carried out on three specimens of the same sample subjected to different confining stresses.

Since all specimens are supposedly saturated the shear strength are similar for all tests. The results of the test are plotted as curves of principal stres difference against strain. For conditions of maximum principal stress difference (taken as failure) Mohr circles are plotted in terms of total stress. The average undrained shear strength should be noted, and the failure envelope drawn tangential to the Mohr circles in order to find the “undrained cohesion intercept” and undrained “angle of shearing resistance”.

Typical configuration of system for different tests (UU-CU-CD)

Product Code

Description

UU

UU-CU-CD

UTM-0108

Multiplex Universal Electromechanic Test Machine*

1

1

UTGM-0010

Load Cell 5 k N

1

1

UTS-0400

UTS-0401

Triaxial Cell**

1

1

UTS-0405

Block with One Connection Line for Triaxial Test Cells,

1

-

UTS-0406

Block with 3 Connection Lines for Traxial Test Cells

-

1

UTGM-0110

Pressure Transducer

1

3

UTS-0408

Oil and Water Constant Pressure System

1

2

UTS-0415

Automatic Volume Change Unit

-

1

UTG-0320

Static Unilogger4 Channels

-

1

UTS-0416

Software to Perform UU Triaxial Tests

1

1

UTS-0417

Software to Perform CU-CD Triaxial Tests

-

1

UTS-1330 and

UTGP-1140

De-Airing Water Tank, 7 L. and Hose

1

1

*Supplied complete with UTGM-0025 50 kN Load Cell, UTGM-0062 25 mm Linear Potentiometric Transducer and  UTC-4930 BC 100 Data Acquisition and Control Unit.

**Choose the suitable cell for the specimen size (UTS-0400: 38-50 mm dia. samples / UTS-0401: 70-100 mm dia. samples).  For cell accessories and sample prepatarion accessories see next page.

Optional apparatus for de-airing water see page 8.

Multiplex Universal Electromechanic Test Machine

The UTM-0108 Multiplex Universal Electromechanic Test Machine is a Servo Controlled Multiplex Machine supplied complete with UTGM-0025 50 kN Load Cell, UTGM-0062 25 mm Linear Potentiometric Transducer and UTC-4930 BC 100 Data Acquisition and Control Unit. 5 kN Loadcell should be ordered separately for Triaxial Tests.

The Frame capacity is 50 kN. This versatile digital loading frame features a microprocessor controlled drive system with an advanced servo motor enabling the operator to easily set any test speed via the membrane keyboard. The keyboard comprises adjustment buttons such as “start”, “increase”, “automatic”, “manual”, “down”, “up”. The testing speed can be set between 0,00001 mm/min to 51mm/min. The test automatically stops when load and displacement is reached to 99% value of the set measuring range. See page 243 to 245 for details.

Load and displacement values are collected by BC 100 and transferred to PC for further processing with the UTS-0416 UU and UTS-0417 CU-CD Software.

Dimensions

550x650x1100 mm

Weight (approx.)

95 kg

Power

750 W

BC 100 Unit

BC100 TFT unit is designed to control the machine and processing of data from load-cells, pressure transducers or displacement transducers which are fitted to the machine.

All the operations of BC100 are controlled from the front panel consisting of a 800x480 pixel 65535 color resistive touch screen display and function keys 4 analogue channels are provided for load-cells, pressure transducers or displacement transducers.

BC100 has easy to use menu options. It displays all menu option listings simultaneously, allowing the operator to access the required option in a seemless manner to activate the option or enter a numeric value to set the test parameters.The BC100 digital graphic display is able to draw realtime "Load vs. Time", "Load vs. Displacement" or "Stress vs. Time" graphics.

BC100 unit offers many addition unique features. You can save more than 10000 test results in its internal memory. BC100 unit has support for various off-the-shelf USB printers, supporting both inkjet and laser printers(ask for compatible models). Thanks to its built-in internet protocol suite, every aspect of BC100 device can be controlled remotely from anywhere around the world.

Main Features
  • Can make test with displacement or load control.
  • Real time display of test graph.
  • CPU card with 32-bit ARM RISC architecture
  • One analog channel for high capacity load cell, one analog channel for low capacity load cell, one analog channel for displacement transducer and one analog channel for cell pressure ( only for UU tests)
  • Programmable digital gain adjustment for load-cell, pressure transducers, strain-gauge based sensors, potentiometric sensors, voltage and current transmitters
  • 1/256000 points resolution per channel
  • 10 data per second sample rate for each channel
  • Ethernet connecting for computer interface
  • 800x480 resolution 65535 color TFT-LCD industrial touchscreen
  • 4 main function keys
  • Multi-language support
  • 3 different unit system selection; kN, Ton and lbf
  • Real-time clock and date
  • Test result visualization and memory management interface
  • Remote connection through ethernet
  • USB flash disc for importing test results and for firmware
  • USB printer support for inkjet and laser printers (ask for compatible models)
  • Camera support for real-time video recording during test (ask for compatible models)
  • Free of charge PC software for the test control and advanced report generation
Data Acquisition & PC Software

The CU-CD triaxial test is a complicated test needs load data, diplacement data 3 pressure data from triaxial cell and volume change data. Load data and displacement data are transfered and recorded  through BC 100 Unit to the  software. 3 pressure data from triaxial cell and volume change data transfered and recorded through  the unilogger  to  the software.

The UTEST software  for CD-CU tests  is compatible with UTEST UTG-0320 datalogger and BC 100 unit. UTEST unilogger can be connected  to PC by RS232 port.  All channel gains can be set manually and accuracy of the reading can be increased.

Triaxial Software is a modular software that when a new test wanted to do, it directs the user step by step. First the software wants to input initial measurements such as diameter, heigth, sample weigth etc. On this stage the user decides CU or CD test will be done and enters cell pressure increment steps, back pressure differential pressure and effective stress that will be used on consolidation.

After the initialization is completed, the user goes to Saturation Cell Pressure increment stage. Cell presure must be incremented to the pressure entered at initialization stage. During this stage the software calculates B and pore pressure and submits their graph respect to time. When B value saturates this stage must be ended. Generally value of B would not reach to 0.95, therefore a back presuure increment stage must be implemented. On the saturation back pressure increment stage, prior to the start of this stage software commands what back pressure must be applied respect to initial settings. The software draws volume change and pore pressure data during this stage.

Saturation stages can be done recursively at most of 10 cycles. The relevant data of each stage is written to respective files for further investigation and report facilities. When the saturation is completed the consolidation stage can be implemented.On this stage the software commands to adjust both cell and back pressure to apply effective stress. On the consolidation stage Volume change,pore pressure and pore pressure disssipation percent is drawn as graphs. When the stage is completed, the next stage will be shear stage of CU or CD. The software suggest the shear speed respect to the results found on consolidation stage. Axial displacement and force must be tared prior to the start of shearing.

On the shear stage deviator stress, pore pressure, ơ' versus ơ'3 and s' versus t' graphs are drawn. 4 different test specimen can  be configured in same file. All the results are used for drawing mohr circles. The data is evaluated with respect to specimen shear end condition. This condition  can be selected as constant pore pressure, constant volume change effective prime deviator ratio etc. With the final measurements one set of data is closed.

The raw data can be exported to Microsoft Excel. Without using Microsoft Excel environment all reports can be printout which includes summary of each stage with relevant graphs.

Triaxial Cells & Sample Preperation

UTS-0400            Standard Triaxial cell for 38 and 50 mm dia. samples
UTS-0401            Standard Triaxial cell for 70 and 100 mm dia. samples

The cell has been designed and treated to minimize corrosion. Particular attention has been paid to the quality of finish between the piston and the head. Final assembly includes the fitting of       an O-ring seal and the use of a special lubricant to reduce friction to a minimum and eliminate water leakage. The piston load capacity is designed to accept high axial loads which may be present during the final stages of a test.

Each cell has five take-off positions drilled in the base for top drainage/back pressure, pore water pressure and bottom drainage. Three no volume change valves and anvil for displacement transducer are supplied complete with the cell. Each cell will accept a range of base adaptors and various accessories for testing a wide range of specimens.

The cell capacity is designed to tolerate confining pressures as high as 1700 kPa which is enough for simulating most in-situ conditions.

For cell accessories and sample prepatarion accessories see next page.

 

UTS-0400

UTS-0401

Dimensions

160x160x400 mm

210x210x550 mm

Weight (approx.)

4.5 kg

12 kg

 Cell Accessories

Sample Diameter(mm)

38

50

70

100

UU

Test

CU CD

Test

Base Adaptor

UTS-0420

UTS-0450

UTS-0470

UTS-0500

YES

YES

Porous Top Cap

UTS-0421

UTS-0451

UTS-0471

UTS-0501

YES

YES

Nylon Tubing for Drainage

UTS-0422

UTS-0452

UTS-0472

UTS-0502

--

YES

Pair of Porous Discs

UTS-0423

UTS-0453

UTS-0473

UTS-0503

--

YES

Rubber Membrane

UTS-0424

UTS-0454

UTS-0474

UTS-0504

YES

YES

Membrane Placing Tool (Strecher)

UTS-0425

UTS-0455

UTS-0475

UTS-0505

YES

YES

0 Ring (10pcs.)

UTS-0426

UTS-0456

UTS-0476

UTS-0506

YES

YES

0 Ring Placing Tool

UTS-0427

UTS-0457

UTS-0477

UTS-0507

YES

YES

Leteral Filter Paper (50 pcs.)

UTS-0428

UTS-0458

UTS-0478

UTS-0508

--

YES

Filter Paper Discs (100 pcs.)

UTS-0429

UTS-0459

UTS-0479

UTS-0509

--

YES

Plastic Discs (2 pcs.)

UTS-0430

UTS-0460

UTS-0480

UTS-0510

YES

--

Sample Preperation Accessories

Sample Diameter

38 mm

50 mm

70 mm

100 mm

Split Sand Former

UTS-0431

UTS-0461

UTS-0481

UTS-0511

Split Mould

UTS-0432

UTS-0462

UTS-0482

UTS-0512

Cutter

UTS-0436

UTS-0466

UTS-0486

UTS-0516

Aliminium Dolly

UTS-0437

UTS-0467

UTS-0487

UTS-0517

Oil and Water Constant Pressure System

Product Code

UTS-0408            Oil and Water Constant Pressure Unit, 1700 kPa220-240V, 50-60Hz, 1ph
UTS-0409            Digital Pressure Gauge, 1700 kPa (250 psi)
UTGM-0110       Pressure Transducer, 2000 kPa

The Oil and Water Constant Pressure Unit is extremely versatile and can be used in conjunction with a wide range of test equipment. The unit provides continuous variable pressure up to 1700 kPa. Pressure is increased or decreased simply by turning a control wheel.

The Unit is used for providing cell/back pressure in triaxial tests. The apparatus is supplied without a gauge for those customers who have suitable pressure monitoring equipment.

As optional equipment for monitoring the pressure of the  unit;

  • The Digital Pressure Gauge (UTS-0409) or
  • The pressure transducer(UTGM-0110) which can be used with UTEST BC100 TFT Unit on the Multiplex Universal Electromechanic Test Machine (UTM-0108) for only UU test or
  • The pressure transducer(UTGM-0110) which should be used with the datalogger (UTG-0320) for CU-CD tests

can be used and prefered optional equpment should be ordered separately.

The machine features a clear hydraulic/water interface reservoir and up to 1 liter capacity of water is available under pressure. Supplied complete with 2 liters of No.46 regular hydraulic oil.

Product Code

Dimensions

Weight

Power

UTS-0408

300x250x250 mm

7.5 kg

35 W

UTS-0409

150x150x100 mm

0.6 kg

 

Volume Change Measurement

Product Code

UTS-0415            Automatic Volume Change Unit

The Unit  consists of a piston connected to a 25 mm travel linear transducer which is sealed against a precision machined calibration chamber so that the linear movement of the piston is exactly proportional to the volume of water in the calibration chamber.

The apparatus creates an electrical signal proportional to the volume of water flowing through the unit. By connecting it to the data acquisition system the measured volume change will be used by software during the test and in final report.

Capacity                              : 100 cm3

Transducer Input            : up to 12 V DC

Accuracy                             : ± 0.1 ml

Dimensions

260x260x400 mm

Weight (approx.)

5 kg

Pressure Transducer and Connection Block for Pore Water Pressure Measurement and De-Airing

Product Code

UTGM-0110       Pressure Transducer, 2000 kPa
UTS-0405            Blockwith One Connection Line for Triaxial Test
UTS-0406            Block with Three Connection Lines for Triaxial Test 

The Pressure Transducer is used for the measurement of cell or back or pore pressure of water in triaxial test systems and also should be used with an UTEST BC100 TFT Unit (UTC-4930) or a datalogger (UTG-0320)

The Block for triaxial test cells is used for connection of the pressure transducers and de-airing in the water hoses.

De-Airing Water

Product Code

UTS-0418            De-Airing Water Apparatus, 230V, 50Hz, 1ph
UTS-1330            De-Airing Water Tank, 7 L.
UTGE-3580         Vacuum Control and Water Connection Panel with Regulator and Vacum Gage Manometer
UTGE-3585         Connection Panel for Vacuum and Water with Vacuum Gage Manometer
UTGE-3505         Vacuum Pump 51 L/min. Capacity,220-240 V 50-60 Hz
UTGG-2015        Filter Flask 2000 ml
UTGE-3570         Air Drying Unit / Water Trap, Vacuum Type
UTGP-1140         Plastic Hose, Ø8mm, 6m

The UTS-0418 De-Airing Water Apparatus is a compact and self-contained equipment which can de-air water quickly and efficiently down to levels of dissolved oxygen acceptable for geotechnical test methods.The apparatus used in conjunction with the de-airing tank (UTS-1330). Air is removed from the water by a vacuum system. De-airing tank should be ordered separately.

The first option for de-airing water;

  • De-Airing Water Apparatus UTS-0418
  • De-Airing Water Tank(UTS-1330)
  • Vacuum Control and Water Connection Panel with Regulator and Vacum Gage Manometer(UTGE-3580) or Connection Panel for Vacuum and Water with Vacuum Gage(UTGE-3585) (These panels are optional)
  • Plastic Hose (UTGP-1140 )

The second option for de-airing water;

  • Vacuum Pump (UTGE-3505),
  • Filter Flask (UTGG-2015) or Air Drying Unit / Water Trap (UTGE-3570)
  • De-Airing Water Tank (UTS-1330)
  • Vacuum Control and Water Connection Panel with Regulator and Vacum Gage Manometer (UTGE-3580) or Connection Panel for Vacuum and Water with Vacuum Gage(UTGE-3585) (These panels are optional)
  • Plastic Hose (UTGP-1140 )

By using UTGE-3580 Vacuum Control and Water Connection Panel, vacum pressure degree can be regulate.

By using UTGE-3585 Connection Panel for Vacuum and Water with Vacuum Gage Manometer and UTGE-3580 Vacuum Control and Water Connection Panel with Regulator, de-aring water equipment can be used without repeated assembling the hoses.

Product Code

Dimensions

Weight (approx.)

UTS-0418

465x240x340 mm

15 kg

UTGE-3580

450x150x500 mm

7 kg

UTS-1330

250x250x250 mm

2.7 kg

UTGG-1442

120x120x220 mm

0.5 kg

UTGE-3505

300x150x240 mm

8.5 kg

UTGE-3570

70x80x170 mm

0,5 kg