Servo-Pneumatic Four Point Bend Apparatus Standalone MkIV

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

Servo-Pneumatic Four Point Bend Apparatus
Details of precision engineered beam cradle, adjustable servo-clamping and strain measurement
Detail of Servo-Pneumatic Four Point Bend Apparatus
Detail of Servo-Pneumatic Four Point Bend Apparatus

Main Features

Compact and convenient, the Servo-Pneumatic Four Point Bend Apparatus Standalone features a digitally-controlled servo-pneumatic actuator that delivers highly accurate loading in both stress and strain control modes. Its beam cradle designed to subject asphalt beam specimens to four point bending with backlash free rotation and horizontal translation at all load reaction points. This new model is now designed to provide a range of precise strain measurement options - at top-center from floating beam (EN, Austroads), the neutral axis referencing the outer pivots (ASTM, AASHTO), or top-center referencing the outer pivots.

Controlling the Four Point Bend Apparatus Standalone is the Third Generation Integrated Multi-Axis Controls and Data Acquisition System (IMACS2) and UTS Neutron test application software.

The Four Point Bend Apparatus is of great benefit for your Superpave and other performance-based testing programs for measuring stiffness & fatigue properties, characterizing mixtures and as inputs into sophisticated pavement design models.

  • tecnical specifications
    • Scroll the table
      • Loading frequency: up to 60 Hz (load limitations apply at higher frequencies)
      • Load capacity: up to 5 kN dynamic
      • Optional on-specimen displacement transducers LVDT +/- 0.5mm, +/- 1mm or +/- 2.5mm


      • Specimen sizes: Max height 70 mm, Max width 80 mm, Length from 380 mm to 500+ mm
      • Accommodates typical 50 x 50 x 400 mm, 60 x 60 x 400 mm, 50 x 63 x 400 mm and 70 x 70 x 500 mm specimens


      • Inner span ≤118.5 mm to >140 mm
      • Outer span ≤355.5 mm to >420 mm
      • Yoke Alignment Tool 50 x 50 x 355.5 mm (H x W x Outer span centers) 70 x 70 x 420 mm (optional)


      • Apparatus 600 x 230 x 490 – 560mm (H x D x W) / 35kg
      • IMACS2 445 x 280 x 245 mm (H x D x W) / 11kg
      • Air Accumulator 330 x 470 x 450mm (H x D x W) / 9.5kg


      • Air supply Clean, dry air at 800 – 900kPa
      • Minimum flow rate 5 liter/sec
  • ordering info
    • 79-PV74A12/I2
      Servo-Pneumatic Four Point Bend Apparatus standalone, including IMACS2 digital control and data acquisition system.
      110-230 V, 50-60 Hz, 1 ph

      On-specimen LVDT (+/-0.5mm) with ILC

      On-specimen LVDT (+/-1mm) with ILC

      On-specimen LVDT (+/-2.5mm) with ILC
  • accessories
    • Environmental Chamber
      Environmental chamber for servo-pneumatic testing machine, -25 to 60° C.
      110-230 V, 50-60 Hz, 1 ph.

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