Dynamic Shear Rheometer DSR
The DSR is a high-performance, research-grade instrument designed to characterize the viscous and elastic behavior of asphalt binders at medium to high temperatures. By applying oscillating shear stress to thin film samples, it precisely determines the rheological properties necessary for Performance Grade (PG) classification.
Key Performance Features
- Precision Torque Control: Utilizes a high-resolution air-bearing motor to apply precise shear stress, allowing for the characterization of both unmodified and polymer-modified binders.
- Rapid Thermal Equilibrium: Features a high-speed thermoelectric (Peltier) heating and cooling system for rapid temperature changes and exceptional stability within the sample gap.
- Automatic Gap Setting: Simplifies testing with motorized gap adjustment and thermal expansion compensation, ensuring consistent results regardless of temperature fluctuations.
- Versatile Testing Modes: Supports a wide range of protocols, including Multi-Stress Creep Recovery (MSCR), Linear Amplitude Sweep (LAS), and standard oscillation tests.
- Streamlined Workflow: Designed for high-throughput labs with easy-to-clean geometries and intuitive software that guides the user through the grading process.
Technical Specifications
Feature | Specification |
Standard Compliance | AASHTO T315, ASTM D7175, EN 14770, AASHTO T350 (MSCR) |
Temperature Range | -30°C to +150°C (standard range) |
Torque Range | 10 nNm to 200 mNm (highly sensitive) |
Angular Velocity | 0 to 300 rad/s |
Gap Measurement | Automated with 0.1 µm resolution |
Data Management | PC-driven software with automated QC/QA reporting and cloud export |
Geometries | Standard 8 mm and 25 mm parallel plates included |
Advanced Analysis Capability
The DSR is the primary tool for determining the Complex Shear Modulus and the Phase Angle . These values are critical for predicting:
- Rutting Resistance.
- Fatigue Cracking.