Large Hydraulic Four Point Bending Machine

A high quality research tool that also allows for fast throughput of multi-sized beam specimens.

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. This equipment is capable of testing over a wider frequency range (up to 60Hz) than can be achieved with pneumatic loading systems.

The Large Hydraulic Four Point Bending Machine CRT-LH4PT-BB 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 30ºC. The unique constant torque clamping and three-transducer deflection measurement system of the CRT-LH4PT-BB can be configured to accept different beam sizes. This means that the ratio between the beam dimensions and maximum aggregate size of test specimens will satisfy the requirements of the relevant European specifications.

Key Uses Mix design End product specification Assessment of new materials		Standards EN 12697-24 Annex D EN 12697-26 Annex B AASHTO T321-03 (TP8)
Key Features Frequency range 0.1 to 60Hz High quality servo-hydraulic four point bending machine Double acting fatigue rated hydraulic actuator with integral stroke tranducer Utilises Star servo valve with 'Sapphire Technology' Unique three transducer on-specimen deflection measurement system Accepts various beam sizes: 380 to 600mm in length and 50x50mm to 100x100mm cross-section Temperature controlled cabinet range -20 to 30ºC Sinusoidal controlled strain or controlled stress fatigue test modes Constant torque motorized specimen clamping to eliminate errors due to localised beam indentation User friendly software for determination of fatigue resistance and stiffness modulus The possibility to make frequency/temperature sweeps Covered for noise reduction		Software 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 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

Calibration & Maintenance

Calibration, Annual Service and Maintenance Contracts are available for this device. UKAS accreditation to satisfy typed testing as described in EN 13108. Please enquire for further details.

Note: This device should be checked and calibrated annually.

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