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. 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. 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.

Main Features:

Digital servo- pneumatic actuator provides accurate control of loading waveshape

Deflection can be measured at the neutral axis or at the top surface of the specimen.

Constant force motorized clamping with multiple preset force levels

Backlash free rotation and translation on all load and reaction points

Includes both on-specimen and outer fixed reference point strain measurement capabilities

Sinusoidal or haversine controlled stress loading

Non-linear regression data fitting ensures reliable determination of phase and modulus.

Technical Specifications:

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

Loading Spans

Inner span ≤118.5 mm to >140 mm

Outer span ≤355.5 mm to >420 mm

Alignment Tool 50 x 50 x 355.5 mm (H x W x Outer span centers) 70 x 70 x 420 mm (optional)

Specimen Dimension

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

Dimensions And Weight

IMACS2 445 x 280 x 245 mm (H x D x W) / 11kg

Apparatus 600 x 230 x 490 – 560mm (H x D x W) / 35kg

Air Accumulator 330 x 470 x 450mm (H x D x W) / 9.5kg.