Stand Alone Four Point Bending Beam Machine


Product code: CRT-SA4PT-BB

Stand Alone Four Point Bending Beam Machine

A low cost, accurate beam testing system which facilitates the rapid throughput of modulus and fatigue tests

Bending tests are widely used for measuring the stiffness modulus and assessing the fatigue resistance of asphaltic paving materials. Four point bending tests are included in CEN, AASHTO and Chinese test specifications. The specimen is a prismatic beam which is subjected to sinusoidal loading in either the controlled strain or controlled stress modes.
The CRT-SA4PT-BB uses advanced servo pneumatic 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 clamps are at 118.5mm centres (the distance between the outer clamps is 335.6mm (14 inches) according to AASHTO specifications² but the height and width of the beam can be varied).

² Tests on beams containing aggregates greater than 20mm are not strictly in accordance with annex D of EN 12697-24 which states that this non-compliance should be explicitly mentioned in the test report.


  • EN 12697-24 Annex D
  • EN 12697-26 Annex B
  • AASHTO T321-03 (TP8)
  • Chinese Standard
  • Key Features

  • Frequency range 0.1 to 30Hz¹
  • Low cost pneumatic stand alone four point bending machine
  • Utilises a low-friction actuator and high performance ceramic spool servo-valve
  • On-specimen measurement system removes errors due to frame flexure
  • Accepts AASHTO beam sizes
  • Sinusoidal controlled strain or controlled stress fatigue test modes
  • Constant torque motorized specimen clamping to eliminate errors due to localised beam indentation
  • Self-contained loading system
  • User friendly software for determination of fatigue resistance and stiffness modulus
  • Supplied with certification of a UKAS accredited calibration

  • Key Uses

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


  • Measurement of up to 32 transducers
  • Wave Types:
  • Haversine
  • Pulse
  • Square
  • Triangle
  • Constant
  • Ramped
  • Rest Periods


  • User friendly, intuitive and reliable Windows™ software developed using LabVIEW™
  • Specifically written to meet EN 12697-24 Annex D and EN 12697-26 Annex B
  • The user interface can be translated into the user’s preferred language – please enquire
  • 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
  • SA4PT Software

    *cDAC & Dimension optional. Please enquire for details.

    Force Transducer ±5kN
    Specimen Transducer Range mm ± 1
    Actuator stroke mm 10
    Frequency Hz 0.1 to 30
    Electrical Supply¹ 220-240 Volts 50 Hz @ 13A
    Compressed Air 7-10 bar @ 600 L/min
    Dimension mm (WxDxH) Test Frame 440 x 190 x 570
    Data Acquisition Box 360 x 280 x 140
    Working space required mm (WxDxH) 826 x 1650 x 2100 when fitted in cabinet CRT-TCC
    Estimated Weight Kg Test Frame 45
    Data Acquisition Box 6
    PC Included

    ¹ others available upon

    Calibration & Maintenance

    Calibration, Annual Service and Maintenance Contracts are available for this device. Please enquire for further details. Note: This device should be checked and calibrated annually.

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

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