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Stand Alone Four Point Bending Beam Machine

CATNOCRT-SA4PT-BB
  IMAGE SHOWS MAIN UNIT ONLY
DESC

BRIEF INTRODUCTION

 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 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.

SYSTEM ELEMENTS The SYSTEM ELEMENTS The CRT-SA4PT-BB is comprised of:

  • An aluminium test frame
  • Precision servo-valve with ceramic spool
  • Pneumatic actuator with low friction seals
  • Fatigue-rated pancake load cell (±5kN capacity)
  • On specimen cradle for deflection measurement
  • Constant torque beam clamping system using recirculating balls screws
  •   Linear bearings allowing free translation of all four clamps
  •   Roller bearings allowing free rotation of all four clamps
  • Digital signal processor control unit
  • ±1.0mm range AC LVDT displacement transducer
  • ±7.5mm range AC LVDT displacement transducer Note: Precise control of temperature is essential for all asphalt testing. A temperature controlled cabinet (CRT-TCC) is available separately.

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
  • Constant torque motorized specimen clamping removes errors due to localised beam indentation
  • Supplied with certification of a UKAS accredited calibration

 

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)

¹ At higher strains or on stiff mixtures, higher frequencies are not always achievable.

 For regular testing with such conditions the CRT-LH4PT-BB should be considered. at 118.5mm centres (the distance between the outer clamps is 355.6mm (14 inches) according to AASHTO

 

SPECIFICATIONS

  • Force Transducer ±5kN
  • Specimen Transducer Range ± 1mm
  • Actuator Stroke 10mm
  • Frequency 0.1 to 30Hz
  •  Electrical supply 220-240 Volts 50Hz @ 13A (others available)
  • Compressed Air 7-10 bar @ 600 L/min
  • Dimensions mm (WxDxH) Test Frame 440x190x570 Data Acquisition Box 360x280x140
  • Working space required mm (WxDxH) 826x1650x2100 when fitted in cabinet CRT-TCC
  • Estimated Weight Test Frame 45kg Data Acquisition Box 6kg
  • PC Required (Please enquire for minimum specifications)

 

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
  • 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.
STANDARDEN126 97-24 Annex D , EN 126 97 -26 Annex B, AASHTO T321-03 (TP8)
QUANTITY-1
DTIME120 DAYS
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