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Dynamic Shear Rheometers (DSR) classify asphalt binders based on their resistance to damage from age, temperature, and mechanical forces over a wide temperature range. DSR’s are particularly important in characterizations of polymer-modified, performance graded (PG) binders used in modern Superpave mix designs. A disc-shaped binder sample is confined between two parallel plates and subjected to horizontal oscillation to determine dynamic shear properties. Anton Paar SmartPave Dynamic Shear Rheometers are configured to meet the demands of everyday quality control testing of 4mm, 8mm, and 25mm samples in asphalt production facilities. These models are ideal for the classification of SHRP/Superpave PG binders.
The synchronous, brushless DC motor drives a rotor mounted on a frictionless air bearing to allow the most precise movement and sensitive measurements. The maximum torque is 125 mNm (milliNewtons-meter) and the minimum oscillation torque is 1μNm. The speed range is from 6-3 to 1,500rpm. A clean, dry, and oil-free supply of compressed air are required for operation. Operating air pressures are from 58 to 101psi (4 to 7bar) with optimum pressure of 87psi (6bar). User-friendly RheoCompass™ software is included and designed specifically for the needs of the asphalt industry. Intuitive, step-by-step instructions guide a user through predefined standard test procedures and temperature calibration and verification routines are fully automated. Simplified data retrieval and report generation make the software easy to use. Toolmaster™ automatic tool recognition and configuration instantly recognize testing components and temperature control units, eliminating the need to enter data manually when changing components. Quick-Connect coupling allows the one-handed connection of key components and ensures fast, convenient changes. TruRay LED lighting feature provides a clear view of the sample and measurement surface for easy setup and precise filling of the measuring gap. Sliding rail design allows easy access to the sample during trimming and set up operations. Upper and lower measuring plates and fittings for 8mm and 25mm samples are included.
SmartPave l DSR is designed for everyday QC testing and is supplied without the Peltier temperature-controlled hood. This cost-effective model does not fully meet ASTM and AASHTO requirements for total temperature control. The Peltier system in the base provides temperature control for the lower plate.
SmartPave ll DSR is also configured for routine QC testing but fully complies with current ASTM and AASHTO requirements for temperature control of the testing environment. The patented active 8 and 25mm plates and fittings included. Peltier temperature hood controls temperatures both above and below the sample, eliminating temperature gradients and making heating and cooling rates much faster. Test times are reduced, while reproducibility is improved. With no water flow around the sample, set up and testing takes place in a completely dry environment. The temperature range is -5° to 200°C, with temperature gradients less than 0.1°C.
The HM-90 and HM-91 DSR units operate on 115 and 230V, 50 or 60Hz power supplies.