Abstract: The moisture susceptibility material testing apparatus includes a specimen chuck, multiple rollers, a temperature controlled water bath, and a control system to automate the testing cycle and collection of data. The water bath is prepared at the desired testing temperature. A material specimen, such as a cylindrical hot mix asphalt (HMA) material specimen, is placed within the water bath on multiple rollers and a specimen chuck then clamps the specimen with an adjustable force. A first and second roller are positioned about the exterior circumference of the cylindrical specimen and a predetermined force is applied radially to the specimen through a third roller. The specimen is rotated about its cylindrical axis, driven by the rotation of the rollers and specimen chuck. A displacement sensor monitors the position of the third roller, yielding a measurement of the rut depth on the material specimen.

Abstract: Devices and methods for providing a known resistance load and measuring an internal gyration angle of a mold in a gyratory compactor. A device in one form has a cylindrical body with protrusions through which a known resistance force is applied by the gyratory compactor, and probes which extend from the body to measure an internal angle of gyration of a mold within a gyratory compactor. The device is placed into a cylindrical mold which is placed into a gyratory compactor. Mold end plates may or may not be required depending on the gyratory compactor configuration and construction of the device body. As the mold is tilted on its axis to an operative gyration angle, the protrusions on each end of the body apply a moment force to the mold which produces a known resistance force on the gyratory compactor frame. Measurement of an internal angle of gyration is made while the resistance force is applied to the compactor frame and while the gyratory compactor gyrates the mold.

Abstract: Devices and methods for providing a known resistance load and measuring an internal gyration angle of a mold in a gyratory compactor. A device in one form has a cylindrical body with protrusions through which a known resistance force is applied by the gyratory compactor, and probes which extend from the body to measure an internal angle of gyration of a mold within a gyratory compactor. The device is placed into a cylindrical mold which is placed into a gyratory compactor. Mold end plates may or may not be required depending on the gyratory compactor configuration and construction of the device body. As the mold is tilted on its axis to an operative gyration angle, the protrusions on each end of the body apply a moment force to the mold which produces a known resistance force on the gyratory compactor frame. Measurement of an internal angle of gyration is made while the resistance force is applied to the compactor frame and while the gyratory compactor gyrates the mold.

Abstract: The moisture susceptibility material testing apparatus includes a specimen chuck, multiple rollers, a temperature controlled water bath, and a control system to automate the testing cycle and collection of data. The water bath is prepared at the desired testing temperature. A material specimen, such as a cylindrical hot mix asphalt (HMA) material specimen, is placed within the water bath on multiple rollers and a specimen chuck then clamps the specimen with an adjustable force. A first and second roller are positioned about the exterior circumference of the cylindrical specimen and a predetermined force is applied radially to the specimen through a third roller. The specimen is rotated about its cylindrical axis, driven by the rotation of the rollers and specimen chuck. A displacement sensor monitors the position of the third roller, yielding a measurement of the rut depth on the material specimen.