équipement de laboratoire d'essai des matériaux

Standard EN 12697-25, NCHRP 9-19, 9-29, AASHTO TP97

 Designed and manufactured to high precision and quality, the Automatic Triaxial Cell provides a versatile, user friendly and accurate device for testing applications where lateral confinement of the specimen is required. This triaxial cell is suitable for a range of materials including asphalt, soils and unbound granular materials.

SPECIFICATIONS
Features
• Automatic pneumatically operated lift cylinders that raise and lower the cell wall
• Fitted with pressure relief valve for greater safety
• Crystal clear heavy duty acrylic cell wall for maximum visibility of specimen
• Low friction loading shaft
• Capable of operating between -15°C to +60°C
• Provision for pressure and temperature transducers
• Provision for up to 3 (internal) on specimen transducer
• Cell pressure up to 275kPa

Testing Standards
• EN 12697-25:2005 Test Method B
• NCHRP 9-19
• NCHRP 9-29
• AASHTO TP79

Dimensions and Weight
Open Height: 655mm
Closed Height: 405mm
Width: 418mm
Weight: 50 kg
Air Supply
Confining Air: Clean Dry Air 400 to 500kPa  2 litres/second
Lift Cylinder Air: 400 to 500kPa
Negligible air consumption

Testing Made Easy
To facilitate quick, simple and easy operation, we have developed the Automatic Triaxial Cell. To minimize disturbance to the sample and reduce heavy lifting. We have incorporated innovative pneumatic lift cylinders into the design. These are computer controlled and automatically raise and lower the cell wall to give you complete 360º access to the specimen.
Top mounted LVDT displacement transducers with extension rods enable accurate measurement of specimen deformation and compliance with a range of international standards, including EN 12697 Part 25 Test method B.

EN 12697-25:2005 Method A
The Cyclic Compression Test Jig is specially designed to meet the requirements of European testing standards. Easy to set up and use, the Cyclic Compression Test Jig is the perfect accessory to complement your testing system.

SPECIFICATIONS
Features 
Precision engineered 
Easy to set-up and use 
Integrated LVDT holders 
Constructed using stainless and nitrite hardened steel Testing Standards 
EN 12697-25:2005 Test Method A

UTS Software
UTS 014 Asphalt Permanent Deformation Test
Characteristics of bituminous mixtures by repeated cyclic or optionally static axial load testing

Dimensions and Weight
Size: 265(H) x 215(D) x 215(W) mm
Weight: 12kg

Cyclic Compression Test

EN 12697-25:2005
This European Standard contains two test methods to determine the resistance to permanent deformation of a bituminous mixture by cyclic compression test with confinement. The test make it possible to rank various mixes or to check on the acceptability of a given mix. Confinement is used in order to obtain realistic test results for gap-graded mixes.

Test method A
A cylindrical test specimen with a diameter of 150 mm, maintained at elevated conditioning temperature, is placed between two plan parallel loading platens. The upper platen has a diameter of 100 mm (by an inclination the pressure area against the specimen has a real diameter of 96 mm). The specimen is subject to a cyclic axial block-pulse pressure.
During the test the change in height of the specimen is measured at specific numbers of load applications. From this, the cumulative axial strain εN (permanent deformation) of the test specimen is determined as a function of the number of load applications. The results are represented in a creep curve, from this the creep characteristics of the specimen are computed.

Standards EN 12697-24, 12697-26
The Indirect Tensile Test Jig is designed to meet the requirements of a range of testing standards. Versatile and easy to set up, the Indirect Tensile Test Jig is the perfect accessory to complement your testing system.

SPECIFICATIONS
Features
• Precision engineered
• Easy to set-up and use
• Integrated LVDT holders
• Adaptable to 100mm and 150mm specimens
• Constructed using stainless and nitrite hardened steel
Testing Standards
• AASHTO T322
• AASHTO TP31
• ASTM D4123
• AS 2891.13.1
• BS DD213
• BS DD ABF
• EN 12697-24
• EN 12697-26
• NCHRP 1-28A
Dimensions and Weight
Size: 275(H) x 285(D) x 200(W) mm
Weight: 9kg

AASHTO T322/TP9
Standard test Method for Determining the Creep Compliance and Strength of Hot Mix Asphalt.
AASHTO TP31
Standard test Method for Determining the Resilient Modulus of Bituminous Mixtures  by Indirect Tension.
ASTM D4123
Standard test Method for Indirect Tension for Resilient Modulus of Bituminous Mixtures.
AS 2891.13.1
Determination of the resilient modulus of asphalt – Indirect te3nsile method
BS DD213
Elastic stiffness: Method for determination of indirect tensile stiffness of bituminous mixtures.
BS DD ABF
Fatigue: Method for determination of indirect tensile fatigue characteristics of bituminous mixtures.
EN 12697-24 ANNEX E
Test methods for hot mix asphalt. Resistance to fatigue
EN 12697-26
Test methods for hot mix asphalt. Stiffness.
NCHRP 1-28A APPENDIX 1
Harmonized Test Methods for Laboratory Determination of Resilient Modulus for Flexible pavement Design.

Integrated Multi-Axis Control System (IMACS) delivers leading-edge performance, unparalleled control and the ultimate in flexible data acquisition. For servo-controlled testing machines, the IMACS provides excellent waveform fidelity from integrated acquisition and control functions, at speeds of up to 5kHz simultaneously on all channels.

SPECIFICATIONS

• 2 axis control and 8 channel data acquisition as standard, upgradeable up to 8 axes control and 32 channel acquisition.
• USB communications port at 10Mb/s or RS-232 communications port at 115kb/s
• Data acquisition speeds of up to 5kHz simultaneous for all channels
• 4x oversampled data acquisition for low noise performance
• Up to 20bit auto-ranging data acquisition
• Analog inputs are software selectable for x1, x4, x16 or Auto gain ranges
• Analog inputs are auto calibrating on power-up
• Flash based firmware allows field updates of all modules
• 8 low noise ‘normalised’ analog input channels
• Up to 3 analog inputs can be used for feedback for each axis
• 12 Digital inputs
• 8 Digital outputs
• 2 channel, 16bit Digital to Analog output which provide flexible driver configuration (bipolar, unipolar, current or voltage)
• 2 solenoid driver outputs per module
• Capacity for up to 4 I/O modules, configurable as acquisition, split axis-acquisition/control or dual axis control
• Size: 270(H) x 350(D) x 460(W) mm
• Weight: 11Kg
• Mains power: 220-240V 50Hz or 110-120V 60Hz

IMACS COMBINED WITH UTS SOFWARE
Leading edge control with:
• Real-time digital computer control for servo controlled testing machines
• Excellent waveform fidelity from the integrated channel acquisition and control functions at speeds up to 5kHz, simultaneous on all channels
• Low data noise performance with 4x over-sampled data
• Exceptional data resolution and control with up to 20bit auto-ranging data acquisition
• Flash based firmware allows field updates of all modules
• USB communication port at 10Mb/s
• Total confidence in measurements taken from analogue inputs that auto-calibrate on power-up UTS Software
• UTS is test and control software. Developed over 20 years it is appreciated by users for its simplicity, clarity and analytical power.
• Powerful and professional Delphi software with real-time graphs for monitoring the specimen under test
• Portable data files for remote viewing, analysis and troubleshooting
• Transducer allocation map allows input channel assignment to test function
• Software selectable transducer calibration and linearisation
• Configurable real-time transducer levels screen
• User customisable test ‘templates’ streamline the testing process
• User selectable test termination sequences
• Virtual machine control pendant for control of all servo axis, power pack pressures and automated frame crosshead position
• Integrated machine status monitoring.

MEASURE RESISTANCE TO THERMAL CRACKING OF BITUMINOUS ASPHALT MIXTURES
Used in conjunction with one of Universal Testing Machines and environmental chambers, the TSRST fixture allows engineers to perform Thermal Stress Restrained Specimen Tensile Strength tests to AASHTO TP10-93. This method determines the tensile strength and temperature at fracture of compacted bituminous asphalt mixtures by measuring the tensile load in a specimen which is cooled at a constant rate while being restrained from contraction.
SPECIFICATIONS
Features
• Fixture fully complies with AASHTO TP10-93
• Self-aligning couplings for true axial alignment
• 25kN capacity
• Specimen Platens 150mm dia, 50mm thick
• 2 x LVDT Displacement Measurement
Range: +/- 0.5mm
Resolution: < 1μm
Accuracy: +/- 0.1% full scale
• Invar Rods provide low thermal expansion for accurate displacement measurement over the full temperature gradient
• Use of load frame alignment for mounting specimen on platens
• Optional Specimen Alignment Stand
• Threaded rods to safely support specimen and fixture after fracture

Temperature Measurement
3x On-Specimen RTDs and
1x Air temperature RTD
Range: -60˚C to +60˚C
Resolution: < 0.1˚C
Accuracy: +/- 0.5˚C
Software
IMACS digital controller and UTS user-friendly software are also available for performing the AASHTO TP10-93 test.

How it works
A cylindrical or prismatic asphalt specimen is fixed to the TSRST platens and an initial tensile load is applied. The specimen is then cooled at a constant rate whilst the specimen is held at a constant length. The thermally induced strain is monitored up until the point of fracture.
The results can be used in pavement design to reduce thermal cracking and improve the lifecycle of bituminous asphalt pavements.

Normas EN 12697-25, BS 598 Parte 111, AS 2891.12

The Uniaxial Test Jig is designed to meet the requirements of a range of testing standards. Versatile and easy to set up, the Uniaxial Test Jig is the perfect accessory to complement your testing system

SPECIFICATIONS
Features
• Precision engineered
• Easy to set-up and use
• Integrated LVDT holders
• Available for 100mm and 150mm specimens
• Constructed using stainless and nitrite hardened steel
Testing Standards
• BS 598 Part 111
• AS 2891.12
• EN 12697-25A:2005
Dimensions and Weight
100mm Specimen Jig
Size: 265(H) x 155(D) x 155(W) mm
Weight: 6kg
150mm Specimen Jig
Size: 265(H) x 215(D) x 215(W) mm
Weight: 12kg

Dynamic Creep (Permanent Deformation) Test

The deformation test would typically be used to gauge the relative performance of asphalt mixes for road pavement design by determining the long term rutting performance. The test measures permanent deformations and strains in the vertical axis of the specimen under load.
During operation of the test, the operator may select a continuous cyclic, repeated cyclic pulse then rest, or static loading stress to be applied to the vertical axis of a specimen. The resulting deformation in the vertical axis is the measured and displayed. An optional additional control axis is available for the application of confining stress.
The test procedures the following properties wich are tabulated and charted as a test proceeds:
Vertical accumulated permanent deformations and strains.
Cyclic repeated loading and seating stresses, or, the static loading stress.