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Direct Tension Testing

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• The Bohlin Direct Tension System (BDT) is a complete instrument for evaluating stiffness and failure properties of asphalt binders at low "in-service" temperature. These low temperature - BDT properties in conjuction with Bending Beam Rheometer (BBR) data, provide a more complete characterization of the asphalt binder. In addition, BDT data predicts the tempreature at which thermal cracking would occur in the actual roadway.
• To provide the most accurate and repeatable result possible, the following key features have been incorporated into the over-all system design. The BDT employs a very stiff load frame and measuring head that rides upon preloaded precision linear bearings to reduce friction and errors associated with system compliance. The measuring head is driven by a high performance linear servo-actuator providing maximum dynamic response and sensitivity without the backlash or wind-up of gear- motor driven system. All key sensor and load cell components are isolated from the fluid bath, ensuring a safe and stable environment. The linear sensor is mounted across the specimen to provide the most accurate strain rate and position information. Lastly, the serviceability and reliability were key considerations in the robust design and final packaging. The system is capable of forces in excess of 500N and speeds from 0.001 mm/min.
• The windows based operating system software is completely automated requiring minimal operator intervention. The application software was developed speciffically for performing the TP3-98 test of low temperature thermal properties. It controls and records all appropriate parameters. Results can be simultaneously displayed on the computer screen and saved to disk, while the test is in progress. The data may be easily exported into other applications, such as Microsoft Excel or Lotus 123. Both data acquisition and closed loop control utilize integrated full 16 bit, digital processing to ensure precision and sensitivity.

• Fully Integrated Software Package
• Real Time Data Acquisition
• Automatic or Manual Operation
• Specification and Research Modes
• Closed Loop Drive Control
• Wide Range Precision Linear Servo Motor
• Computer Controlled Fluid Bath
• Standard PC & Windows Compatible
• Choice of Chiller Options.


Product #ProductNamePower RequirementsStd Chiller DimOverall Bath DimStrokeTemp RangeTemp StabilityRate AccuracyForce AccuracySpeedMax LoadAssembly / Accessories
  BDTBohlin Direct Tension Testing220 VAC, 60 Hz.28L, 13H, 19W Inch36foot 11inches- L, 17foot 6.5inches- H, 16foot 9inches- W20 mm+6 to -36 °C+ 0.1 to -0.1 or better °C0.1% of Setting ±0.5%of reading (to 2% of capacity) °0.001 - 500 mm/min500 N6 molds 12 specimen tabs 2 specimen holders release paper and agent