Laboratory Automatic Asphalt Dynamic Shear Rheometer DSR
PRoduct description
DSR Dynamic Shear Rheometer is based on JTG E20-2011 T0628, ASTM P246, AASHTO T315-09 and other related standards and specifications, integrating high-precision electro-mechanical technology to provide ultra-high accuracy of strain, strain rate, stress control and normal force, which enables standardized operating procedures for the specification testing of asphalt.
Product Features
1. Ultra-low inertia servo motor technology
1.1 Smooth positioning and drive speed regulation is realized by cogging-free torque
1.2 Ultra-low inertia hollow cup motor design, fast torque and speed response, with excellent dynamic characteristics
1.3 Provides extremely high torque and power relative to the size and weight of the motor itself.
1.4 Absolute linear relationship between current and torque, voltage and speed.
2. Ultra-high precision sensing and measuring system
2.1 Optical encoder, with a resolution of 10-4rad, accurately measures rotational angular displacement and angular velocity.
2.2 Highly sensitive normal force sensor design, fast transient response, able to accurately measure and control the normal force
2.3Highly sensitive torque sensor design, can accurately measure the rotor torque
2.4 High precision encoder system accurately measures and controls the vertical running position with a gap resolution of 0.1μm.
3. Temperature control unit
3.1 Upper and lower fixtures are equipped with Peltier temperature control elements embedded with high resolution temperature sensors to ensure fast and accurate sample temperature control.
3.2 Power supply, communication and fluid connections in a one-step plug-and-play design, fast, convenient, solid
4. Integrated design
test host using mechanical, power supply, control, communication, display and other integrated design, small size, high degree of integration, design, processing and assembly of high requirements
5. Intelligent software
5.1 Friendly interface to ensure the best rheological measurement operation
5.2 Including DSR test required fixture, temperature, test and other parameter settings
5.3 Try to avoid the influence of operators
5.4 Display oscillation state, torque and normal force real-time curves, time-temperature equivalent superposition (TTS), generate rheological modulus parameter curve
5.5 According to the test standards and specifications, report qualified or unqualified
5.6 Test software functions and data analysis requirements can be customized according to user requirements
Main technical parameters
1. Rotational speed range：0.01-2850r/min
2. Angular speed range: 0.01-300rad/s
3. Resolution of deflection angle：10-4rad
4. Oscillation frequency: 0.1-20Hz
5. Torque range: 0.001-200mNm
6. Torque resolution: 0.001mNm
7. Normal force range: 0.01-80N
8. Normal force resolution: 1mN
9. Temperature range: 5-85℃
10. Temperature resolution: 0.001℃
11. Temperature control accuracy: ±0.01℃.
12, standard 25mm test plate 1 pair and 8mm test plate 1 pair (other test fixtures and supporting analysis software can be customized)
13.Temperature control unit: the upper and lower fixtures are Peltier temperature control elements, embedded high-resolution temperature sensors to ensure fast, accurate sample temperature control
14. Intelligent software: display the oscillation state, torque and normal force real-time curve, time-temperature equivalent superposition (TTS), to generate the rheological modulus parameter curve
15. Test software functions and data analysis requirements can be customized according to user requirements.
Parameter
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Torque range |
10nNm to 150nNm (200, 350 optional) |
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Torque resolution |
0.1nNm |
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Displacement resolution |
10nrad |
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Control mode |
stress/strain |
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Angular velocity |
0-3rad/s |
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Speed |
< 10-7 rads/sec to 300 rads/sec |
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Vibration frequency range |
10μ - 10Hz |
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Temperature range |
-40~100°C±0.1°C |
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Working power supply |
220V, 50Hz |
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Equipment size (H*W*D) |
500*300*400mm |
Frequently Asked Questions (FAQ)
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Q1: Which international standards and asphalt grading protocols does this Automatic DSR comply with?
A: The instrument fully complies with global Superpave and asphalt binder testing standards:
AASHTO T 315 / ASTM D7175: Standard Test Method for Determining the Rheological Properties of Asphalt Binder Using a Dynamic Shear Rheometer.
AASHTO M 320 / AASHTO M 332: Performance Graded (PG) Asphalt Binder Specifications (including MSCR - Multiple Stress Creep Recovery testing).
EN 14770: Bitumen and bituminous binders - Determination of complex shear modulus (G) and phase angle (delta).
ASTM D7405: Standard Test Method for Multiple Stress Creep Recovery (MSCR) of Asphalt Binder Using a DSR.
Q2: What type of motor and bearing technology powers the measurement drive system?
A:Ultra-Low Friction Air Bearing: Uses a high-precision porous metal air bearing that practically eliminates mechanical friction, enabling ultra-precise torque and normal force measurements even at very low strain levels.
EC/Synchronous Servomotor: Provides rapid response and frictionless torque control from 0.1uN.m to 200mN.m, allowing accurate dynamic oscillation, linear viscosity, and creep recovery (MSCR) testing across unaged, RTFO-aged, and PAV-aged asphalt samples.
Q3: How is temperature controlled, and why is thermal stability so critical for asphalt testing?
A: Asphalt rheological properties (G and delta) are extremely sensitive to temperature changes (± 0.1℃ fluctuation can cause up to a 10% change in modulus).
Peltier Temperature Control System: Advanced upper and lower Peltier thermal control plates deliver rapid heating/cooling rates with a temperature accuracy of ＋0.01℃ across a range of -40℃ to +150℃.
Zero Thermal Gradient: Active thermal hoods completely surround the sample to eliminate vertical and radial temperature gradients.
Q4: What parallel plate geometry sets are included, and what sample types are they used for?
A: The standard system comes with two precision ground stainless steel parallel plate geometry sets:
1.25mm Parallel Plates (1 mm gap): Used for original (unaged) and RTFO-aged asphalt binders tested at high temperatures (+46℃+88℃).
2.8mm Parallel Plates (2mm): Used for PAV-aged (intermediate temperature) asphalt binders tested at lower/intermediate temperatures (+4℃ to +40℃).
3.Auto-Gap Setting: Features automated motorized gap adjustment with thermal expansion compensation to guarantee precise gap height prior to every test.
Q5: Can this DSR perform MSCR (Multiple Stress Creep Recovery) testing automatically?
A: Yes. The software includes pre-programmed AASHTO T 350 / ASTM D7405 / AASHTO M 332 templates for MSCR testing.
Automated Stress Cycling: Automatically executes 1-second creep / 9-second recovery cycles at 0.1kPa and 3.2 kPa stress levels.
Instant Parameter Calculation: Automatically calculates non-recoverable creep compliance (Jnr), percent recovery (R), and traffic loading classification (S, H, V, E grades) without manual spreadsheet editing.
Q6: How easy is the software to operate for routine laboratory technicians?
A:One-Click Test Wizards: Features pre-configured standard test routines (Superpave PG High Temperature, PG Intermediate Temperature, MSCR, Temperature Sweep, Frequency Sweep, and Time Sweep).
Real-time Graphics: Displays live curves of Complex Shear Modulus (G*), Phase Angle (delta), G*/sin (rutting parameter), and G (fatigue parameter).
Automated Quality Pass/Fail Reports: Automatically evaluates whether the tested sample meets target PG specifications and exports standardized PDF, Excel, and CSV reports for easy integration into laboratory LIMS databases.
Q7: What utilities (compressed air, cooling, power) are required for installation?
A:Compressed Air Supply: Clean, dry, oil-free laboratory compressed air at 4.5 bar to 6.0bar (65-87psi) with a dew point below -20℃ (built-in air filtration unit included).
Power Supply: Standard single-phase AC 110-240 V, $50/60 Hz.
Cooling Media: Integrated closed-loop fluid circulator or Peltier heat sink (no external tap water drainage needed during standard operation).
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