Controls Group http://www.controls-group.com/images/logo_controls.gif Semi-automatic Uniaxial and Triaxial test system. Basic test apparatus Semi-automatic Uniaxial and Triaxial test system. Basic test apparatus
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Semi-automatic Uniaxial and Triaxial test system. Basic test apparatus

ASTM D2664 | ASTM D2938 | ASTM D3148 | ASTM D5407 | EN 14580 | EN 1926 | ASTM D7012
Main features
  • Suitable for determining elastic modulus and strength characteristics of rock specimens under uniaxial and triaxial conditions
  • Composed by 2 indipendent systems: high stiffness compression machine and low friction manual pressure maintainer
  • Max working lateral pressure: 70 MPa
  • Advanced external data acquisition system with new touch screen Datalog 8
General description
General description
The Semi-Automatic configuration for determining the elastic modulus and strength characteristics of rock specimens is based on the compression machine with DIGIMAX control system for axial loading and manually-operated pump for confining pressure. It performs either uniaxial or triaxial tests under load/stress control (no strain).
The 2 systems are operated independently and the failure envelope is obtained by a series of individual tests (single - stage) with manual adjustment of the axial load and manual application of the confining pressure at different levels.

Note: For a typical configuration of an Semi-Automatic triaxial test system see Additional information.

TEST PROCEDURE:
  1. axial and confining stresses are independently increased isotropically up to a defined level: axial load is controlled by a special pressure-compensated proportional valve; confining pressure is controlled by the manual pump with pressure maintainer;
  2. cell pressure is maintained constant and axial stress is constantly increased by the pressure-compensated proportional valve up to specimen failure (single-stage);
  3. the procedure above is repeated N times using new specimens at various confining pressure levels. Combining these results it is possible to plot the failure envelope with N points using the dedicated MS Excel spreadsheet.
  4. strain values are acquired by Datalog 8 datalloger.
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Technical specifications

Lateral pressure system
The 45-D0558 Low friction manual pressure maintainer is used for maintaining constant the desired lateral pressure in the Hoek triaxial cells. The unit comprises a hand pump connected to a special oil reservoir, a precision pressure gauge, a pressure maintainer and a flexible hose 3 m long with a 90° quick release coupling.
  • Max working pressure: 70 MPa
  • Weight approx.: 15 kg

Ordering info

Compression machine
50-C56B02
Compression testing machine, 3000 kN cap., Digimax 3, three channels digital display and processing unit, conforming to EN 12390-4, accuracy Class 1. 230 V, 50 Hz, 1 ph
For more info see link to other products below

Lateral pressure system
45-D0558
Low friction manual pressure maintainer for lateral pressure
 

Accessories

Please refer to the links to other products below for more technical and commercial info about:
  • Compression frames
  • Hoek cell and sample extruder
  • Strain gauges for uniaxial and triaxial tests
  • Compression device for uniaxial tests
  • Multipurpose data logger


Additional Information

Typical configuration of a standard semi-automatic system for uniaxial and triaxial tests on rock specimens
 
AXIAL LOAD UNIT AND TEST FRAME
Code Description Uniaxial
Q.ty
Triaxial
Q.ty
50-C56B02 Compression testing machine 3000
kN cap.
1 1
50-Q0050/HRD Upgrading of the 50-C46xx and 50-C56xx series 
compression frames with upper and bottom platen dia 300mm min. hardness 58 HRC
1 1
50-C0050/CAL Special calibration procedure assuring
Class 1 from 1% of full scale
1 1
50-C9086/P Distance piece dia. 200x100 mm 1 -
50-C9083/P Distance piece dia. 200x68 mm 2 1
50-C9080/P Distance piece dia. 200x30 mm 1 -
 
CONFINING PRESSURE
Code Description Uniaxial 
Q.ty
Triaxial
Q.ty
45-D0558  Low friction manual pressure maintainer - 1
45-R0023 Three way connector 1 2
82-P0700 Pressure transducer 700 bar cap. 1 2
82-P0349/ELT              Connection cable to Datalogger             1 2
 
HOEK CELLS (different sizes available. We propose NX model.
Code Description Uniaxial 
Q.ty
Triaxial
Q.ty
45-D0556 Hoek cell, NX 54.7 mm dia. - 1
45-D0556/A Pair of load spreader - 1
45-D0556/B Distance pad - 1
45-D0556/1 Spare rubber membrane - 5
45-D0577/B Rock sample extruder - 1
45-D0577/4 Extruder adapter set for NX specimens - 1
 
UNIAXIAL COMPONENT
Code Description Uniaxial
Q.ty
Triaxial
Q.ty
45-D9035 Compression device for samples up to 55mm diameter x 110 mm height 1 -
 

STRAIN READING (select the suitable strain gauges within the models listed below)
Code Description Uniaxial
Q.ty
Triaxial
Q.ty
82-P9008 8 channels stand alone multipurpose data logger 1 1
82-P9008/ELT Set of four connection cables 1 1

82- P9008/SOF               
DATACOMM 2 data acquisition generic software 1 1
82-P0398 Electric device to complete and compensate up to four Wheatstone bridges with ¼ or ½ bridge set up 1 1
82-P0399/C Strain gauge application kit 1 1
82-P0399/1 Connecting terminals. 50 pairs sheet 1 1
82-P0390 Strain gauge, grid width 4.53x9.53 mm. Pack of 10 1 1
82-P0391 Strain gauge, grid width 3x20 mm. Pack of 10 1 1
82-P0392 Strain gauge, grid width 2x30 mm. Pack of 10 1 1
82-P0393 Strain gauge, grid width 1x60 mm. Pack of 10 1 1
82-P0070/3
MS EXCEL Template for stress/strain analysis, Elastic Modulus and Poisson's ratio processing in uniaxial and triaxial tests (single stage)        
1 1

Documents