BBR Automatic Bitumen Asphalt Bending Beam Rheometer
Test principle
1. Sample preparation: Pour asphalt into standard sized small beams (6.35mm × 12.7mm × 101.6mm) and cure them at a constant temperature at the test temperature.
2. Loading test: Apply a constant load (100g) in a low-temperature environment to cause three-point bending deformation of the asphalt beam.
3. Data collection: Record the deformation curve within 60 seconds and calculate:
-Creep stiffness (S): reflects the low-temperature deformation resistance of asphalt (the smaller the S value, the better the crack resistance).
M value: reflects the stress relaxation ability of asphalt (the larger the m value, the better the crack resistance).
Application Fields
-Road engineering: Evaluate the low-temperature crack resistance performance of asphalt mixtures and optimize asphalt selection.
-Superpave system: Asphalt Bbr Bending Beam Rheometer used for PG (Performance Grade) grading to determine the applicable temperature range of asphalt.
-Research and Quality Control: Study the low-temperature performance of new materials such as modified asphalt and recycled asphalt.
FAQ（Frequently Asked Questions）
Q1: Which domestic and international testing standards does this BBR device comply with?
A: Our BBR equipment fully meets and complies with the following core standards, ensuring that your test report has authoritative legal validity:
International standards: AASHTO T313, ASTM D6648.
Chinese National Standard: JTG E20-2011 (Code of Test Methods for Asphalt and Asphalt Mixture in Highway Engineering) - T 0728 Asphalt Bending Creep Stiffness Test (BBR Method).
The raw data and calculated results generated by the equipment can be directly used for SHRP/Superpave asphalt rating.
Q2: Low temperature rheological testing of asphalt is extremely sensitive to temperature. How do you ensure the accuracy and uniformity of temperature control?
A: Temperature control is the lifeline of BBR. We have adopted a two-stage stacked mechanical refrigeration system (or an efficient liquid nitrogen assisted/refrigerant circulation system), which can achieve excellent low-temperature control without relying on external consumables:
Temperature control range: Usually it can reach minus 40 degrees Celsius to room temperature, meet all testing standard points at minus 36 degrees Celsius and above
Temperature control accuracy: ±0.1℃
Liquid temperature measurement: High precision platinum resistance (PT100) sensors are used, placed adjacent to the sample, to provide real-time feedback on the true temperature of the fluid medium (such as ethanol water solution).
Q3: Is the loading accuracy and displacement measurement accuracy of the equipment high enough? Can modified asphalt be accurately measured?
A: Absolutely possible. For high elasticity modified asphalt or high viscosity asphalt, the equipment has been optimized to the extreme in hardware: precision air bearings: the loading shaft adopts air floating bearings, and the friction force is almost zero,
Ensure extremely precise application of $980mN (standard constant load) with minimal drift.
High resolution LVDT (displacement sensor): With a displacement resolution of up to 0.05um, even small creep deformations can be accurately captured.
Q4: Many experienced technicians have reported that the old BBR model is cumbersome to operate and prone to errors. Where is your "automation" reflected?
A: Our "fully automatic" design aims to reduce manual intervention and minimize "human error": one click testing: after the sample is placed, the startup, temperature control, preloading, formal loading, data acquisition, and unloading are all automatically controlled by software. Automatic contact and zero adjustment: The moment when the contact contacts the sample is intelligently recognized by the sensor, and the zero point is automatically calibrated to avoid errors in manual visual alignment.
Real time curve display: During the testing process, the load time and displacement time curves are refreshed in real time, and the S stiffness modulus and m value (creep rate) are automatically calculated after the test is completed.
Q5: Is daily maintenance of the equipment troublesome? Is calibration convenient?
A: We fully considered the convenience of the laboratory during the design process:
Built in calibration module: The device comes with standard stainless steel calibration beams, calibration weights, and standard displacement blocks. Users can perform self verification at any time according to laboratory qualification requirements.
Rust and corrosion prevention: The liquid immersion tank and mechanical transmission components are all made of 304/316 high-grade stainless steel or hard aluminum alloy, which is resistant to long-term immersion in ethanol/methanol media and is not easy to rust.
Q6: How does after-sales service respond? Does the software support free upgrades?
A: Technical support: Provide remote video installation guidance, telephone support, or on-site engineer training services to ensure that laboratory personnel can quickly get started.
Software update: We promise to provide lifelong free upgrades for the control and data analysis software of this model of equipment to adapt to potential industry standards that may be updated in the future.
Parameter
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Main Technical Indicators |
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Parameter Names |
Details |
| Cylinder Pressure | 1MPa |
| Specimen loading load | 0 ~ 3000 mN |
| Cylinder stroke | 200 mm |
| displacement sensor range | 20 mm 3 ‰ Precision FS |
| Temperature Control Range | - 20 ~ 60 ℃ accuracy of 0.1 ℃ |
| Specimen size | Lenghth 127 mm * thickness 6.35 mm * width 12.7 mm |
| Environment cabinet internal dimension | length 300 mm * 270 mm * wideth 270 mm * height 300 |
| Boundary Dimension | Length 500 mm *width 700 mm * height700 mm |
| Refrigeration power | 1.5 P |
| Heating power | 800 w |
| Power supply voltage | 220 V |
| Silent air compressor(built-in) | 1 KW, 220 V |
Test Results
