• Automated HM-87 CVO model has several operating modes and integrated touchpad controller• HM-86 Air-Bearing model has wider capabilities for research and more accurate testing
• Lower-cost Mechanical Bearing HM-83 is adequate for most QC/QA testing of asphalt binders
A Dynamic Shear Rheometer (DSR) is essential for Superpave determination of linear viscoelastic properties of aged or unaged asphalt binders (modified or unmodified) in the temperature range of 5-85°C. When testing specimens for compliance to AASHTO MP1, a disc of asphalt binder is confined between circular parallel plates and tested at a specified temperature. Dynamic shear modulus is determined by applying a known torque to oscillate one of the plates and measuring the resulting strain. Phase angle, in radians or degrees difference between sinusoidal stress and strain, is also measured. Operate the instrument in strain control (measuring resultant stress) or stress control (measuring resultant strain) modes. Easily perform temperature sweep tests for AASHTO R29. The versatile system also has non-SHRP test modes, useful for research purposes.
Bohlin Systems include a measuring drive unit and a circulator system to immerse the sample in a temperature controlled fluid (usually water). This ensures that sample heating or cooling occurs uniformly and steadily from both above and below the specimens and that temperature stability is better than ±0.03%. Upper stainless steel measurement plates of 8mm and 25mm diameters, lower sample holder plates of 8mm and 25mm and a temperature RTD detector are included. A "NO GAP" feature frees the operator from re-zeroing the instrument gap with changes in temperature or when upper or lower plates are removed or replaced. The two SHRP testing positions are clearly marked, easily selected, and locked. Latest ASTM and AASHTO protocols are built into software and PG Grading is automatic.
HM-83 Mechanical Bearing Rheometer is Lower-cost and serves for most field QC/QA testing or for locations without air supply.
HM-86 Air Bearing Rheometer has a wider range of operating specifications for more diverse applications, including research, and is recommended when an air supply is available.
HM-87 Automatic Air DSR is automated with integrated touchpad controls and electronics so no separate electronics box with cables is required. As supplied by Gilson, the CVO has several operating modes making it superior for ease of performing Superpave work. It is easily configured to suit a wide range of performance with materials such as cutbacks, emulsions, greases, talloils, neat polymers, adhesives, etc. Inquire for accessory CVO options for use beyond Superpave binder testing. Performance of all models is equal for Superpave specifications. Inquire for addition of Research Software options.
A Silicon Rubber Mold Set and Computer/Printer System are required. A Reference Thermal Detector Probe is recommended. HMA-353 Reference Thermal Detector Probe is a thermistor mounted in a silicone wafer calibrated to 0.1°C. This device acts as a dummy specimen for direct in-place calibration of the RTD temperature detector. HMA-356 Silicone Rubber Mold Set is flexible, tear-resistant, and stocked for immediate shipment. HMA-355 Viscosity Standard is designed specifically for the DSR and is NIST traceable. The 2.7 million centipoise fluid is available in 15ml bottles. The DSR-II and CVO specifications for temperature and angular positions exceed Superpave requirements. Included software with all units is MS Windows™ based and includes a special Superpave test mode. (System price includes one-year warranty, installation and training in continental U.S.A., one year of software updates, and a technical support hotline.) Model HM-86 and HM-87 Air Bearing units require an air supply of 1 SCFM at 60 psi. Shipping Data: 240 lb (109kg); Cu. Ft.: 16.
Accessories for Compression Machines Selection Guide
