Rotary Wheel Tester (RWT)
Part # AFW1A
Available Factory Direct
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ASTM D8259/8259M describes a procedure for testing the rutting and moisture susceptibility of asphalt specimens using Pine’s Rotary Wheel Tester. The system was designed to improve the time and specimen preparation required to complete a test. Once the Superpave Gyratory Compactor specimens (SGC) are wrapped, conditioned, and submerged in water, they are confined between three metal wheels in continuous synchronized rotation with each wheel applying a fixed load around the periphery of the specimen. The system records load cycles applied to the specimen, the deformation of the specimen (rut depth), the loading rate, the temperature of the water and the Sigma, which is an indication of specimen roundness.
Los Angeles Accelerated Performance Test:
The City of LA was an early adopter of the Rotary Wheel Tester. It was used to develop The Los Angeles Accelerated Rutting Test Method for permanent deformation and moisture susceptibility. A decade was spent refining the test, resulting in the City of LA writing it into their specifications. Learn more about how the City of LA accelerated Superpave Field Performance Tests compliments of AsphaltPro.