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Large Hydraulic Four Point Bending Machine

The only machine on the market to accept variable beam lengths

Bending tests are widely used for measuring the stiffness modulus and assessing the fatigue resistance of asphaltic paving materials. The Large Hydraulic Four Point Bending Beam Machine uses advanced servo-hydraulic technology and a high-speed digital data acquisition and control system together with user-friendly software. During testing both graphical and tabular data are displayed on screen and test data is stored to disc in Microsoft Excel™ compatible format. The test frame is housed in a Temperature Controlled Cabinet with fan-assisted air circulation and a temperature range of -20 to 30°C. The unique constant torque clamping and three-transducer deflection measurement system of the
The Large Hydraulic Four Point Bending Beam Machine can be configured to accept different beam sizes. This means that the ratio between beam dimensions and maximum aggregate size of test specimens will satisfy the requirements of the relevant European specifications.


  • EN 12697-24 Annex D
  • EN 12697-26 Annex B
  • ASTM D7460
  • AASHTO T321

Key Features

  • Performs tests according to EN 12697-24 Annex D, EN 12697-26 Annex B, ASTM D7460 and AASHTO T321
  • Advanced software allows the user to build and modify test routines for research-level testing
  • Frequency range 0.1 to 60Hz
  • High-quality servo-hydraulic four-point bending machine
  • Double acting fatigue rated hydraulic actuator with integral stroke transducer
  • Star servo valve with ‘Sapphire Technology’
  • Can be used with simple one or research level three LVDT transducers
  • Accepts various beam sizes: 380 to 660mm in length and 50 x 50mm to 100 x 100mm cross-section
  • Integral Temperature controlled cabinet
  • Covered for noise reduction
  • Sinusoidal controlled strain or controlled stress fatigue test modes
  • User defined wave shapes can be used to simulate different types of vehicles
  • Advanced software allows the user to run EN, ASTM and AASHTO analysis concurrently
  • Multistage and multi frequency sequences for Master Curves
  • Relaxation periods can be programmed – for the investigation of healing
  • Camera can be triggered by software for crack initiation and propagation analysis
  • Save full-wave data for any or every cycle for hysteresis analysis
  • Constant torque motorized specimen clamping to eliminate errors due to localized beam indentation
  • Supplied with a certificate of calibration
  • Manufactured in the United Kingdom
  • We (Cooper) are the only manufacturers of Large Hydraulic Four Point Testing machines in the world

Key Uses

  • Mix design
  • End product specification
  • Assessment of new materials


  • User friendly, intuitive and reliable Windows™ software developed using LabVIEW™
  • The user interface can be translated into the user’s preferred language – please enquire
  • One software package performs both fatigue and complex modulus testing
  • Stored test data can be analysed and compared with other test data utilising a spreadsheet package
  • Utilities are included for curve fitting of acquired data; testing of system’s inputs and outputs; phase correction and a transducer database for storing calibration factors


Accessories are not included in the price of main device (unless stated otherwise) and may be purchased separately if required.

CRT-PVC-BEAMLARGE PVC Dummy Specimen 100x100mm
CRT-LH4PT-COMPAIR Integrated Compressed Air Option


Technical specifications are subject to change without notice.

Force Transducer ±10 kN
Specimen Transducer Range mm 3 x ±1
Actuator stroke mm 10
Frequency Hz 0.1 to 60
Temperature (Integral Cabinet) -20 to 30°C
Electrical Supply¹ 3 Phase 415 Volts 50 Hz @ 16A
Compressed Air 7–10 bar @ 100 L/min (optional integral extra)
Dimension mm (W x D x H) 1050 x 1600 x 2100
Working space required mm (WxDxH) 2050 x 2600 x 2300
Weight (approx.) Kg 1200
PC Included

¹ others available upon