to ASTM D6648 and AASHTO T313


The Bending Beam Rheometer (BBR) has been engineered to perform flexural tests on asphalt binder and similar specimens per ASTM D6648-01 and AASHTO T313-02. These tests, initially developed by the Strategic Highway Research Program (SHRP), consist of a constant force being applied to a specimen in a chilled fluid bath in order to derive specific rates of deformation at various temperatures.

A complete BBR system consists of a fluid bath base unit, a three-point bend test apparatus which is easily removed from the base unit for specimen loading and unloading, an external cooling unit with temperature controller, and a calibration hardware kit with carrying case.
  • PID temperature controller with digital display
  • Two independent platinum RTDs for precise temperature control
    • Mechanical refrigeration system
    • External cooling unit with temperature controller
    • Provides test temperatures of -40o to 25o C (ethylene glycol mixture)
  • Three-point bend test apparatus
  • Stainless steel, durable, corrosion-resistant construction
  • Calibration hardware kit with carrying case
  • Meets ASTM and AASHTO test standards
  • Computerised control, data acquisition, and analysis
  • Integral LVDT and temperature-compensated 500 gram load cell
  • Durable, corrosion-resistant construction
  • Includes complete calibration kit with carrying case
  • Includes ASTM/AASHTO-compliant specimen moulds


Load Frame Integral stainless steel frictionless construction
Loading Shaft In-line stainless steel with blunt point
Test Load Variable test range from 0 to 200g standard System maintains required test load within ±0.5g throughout the test cycle
Test Cycle Times Cycle times for pre-load, recovery, and test load are completely operator-adjustable
Load Cell 500g (temperature-compensated)
Mechanical Overload Protection Standard
Test Weights Calibrated and traceable to NIST
Sample Supports 25mm (0.98 in.) diameter stainless steel spaced 4.00 in. (101.6mm) apart
LVDT Displacement Transducer 0.25 in. (6.35mm) calibrated range to provide 2um resolution throughout testing and verification range
Data Display
Large on-screen display of load, displacement, and bath temperature provides ease of setup and operation.
Real-time displacement, loading, and temperature graphs are displayed during the test cycle and can be re-plotted and re-scaled as needed for easy viewing
Cooling Unit Included (non-CFC refrigerant)
Recommended Cooling Bath Fluid Non-flammable ethylene glycol mixture
Operating Temperature Ambient to -40°F (-40°C)
Temperature Measurement Platinum RTD
Power Requirements 230VAC 50Hz
Compressed Air Requirements 50 psi (0.34 MPa) clean, dry air supply required
Approximate Shipping Weight 115kg

Step Disk and Calibration Gaging Kit

Step Disk
  • Prevents movement with detent locking mechanism
  • Highest level of accuracy with precision ball bearings allowing precise repeatability by having one point of contact

Calibration Gaging Kit

  • 5 step disk
  • Four 50g weights, two 2g weights
  • Certified confidence beam
  • Certified compliance beam
  • Carrying case

BBR Software & Reporting Features

  • Software package allows for device configuration, daily verifications, test setup, test initiation, and reporting
  • All test parameters can be revised according to ASTM/AASHTO standards for easily repeated performance
  • Two readings per second
  • Pre-load graph results before initial tests (digital)
  • The pre-test mode includes continuous contact between the loading shaft, anvils and specimen, and the applying and reapplying of 35mN and 980mN of force
  • Data acquisition system records and reports all raw data points, test specimen/setup data, and the test report standard ASCII can be recalled, printed, or imported to other software
  • Constant system error checking
  • Traceable “Test conditions” section
  • Indication of return to original load at the end of the test (daily verification and periodic calibration of the load cell, LVDT, and RTD transducers)
  • Includes program that verifies and eliminates device compliance from the specimen displacement measurements


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