An apparatus for testing paving samples includes a base that includes a paving sample tray about the cabinet and configured for translation relative to the cabinet. A roller is configured for imparting compressive forces to a sample carried by the sample tray. An arm is configured for moving the roller from a stowed position to an in-use position where the roller contacts the sample. A cylinder assembly having a piston therein supplies pressure forces to the arm to move the arm from the stowed position to the in-use position, wherein a depth of travel of the arm is limited by the sample. As the sample is compressed, the depth of travel increases. A measurement device is in communication with the cylinder for determining an amount of travel of the arm to thus determine an amount of compression of the sample.

An apparatus for testing paving samples includes a base that includes a paving sample tray about the cabinet and configured for translation relative to the cabinet. A roller is configured for imparting compressive forces to a sample carried by the sample tray. An arm is configured for moving the roller from a stowed position to an in-use position where the roller contacts the sample. A cylinder assembly having a piston therein supplies pressure forces to the arm to move the arm from the stowed position to the in-use position, wherein a depth of travel of the arm is limited by the sample. As the sample is compressed, the depth of travel increases. A measurement device is in communication with the cylinder for determining an amount of travel of the arm to thus determine an amount of compression of the sample.

An apparatus and method for testing a core rock sample for reservoir souring. The apparatus includes first and second pumps, and a piston cell associated with each of the first and second pumps. Each piston cell has a first portion and a second portion divided by a movable piston such that the second portion is fluidly sealed from the first portion. Each piston cell is configured to receive fluid pumped by its respective pump into the first portion thereof. A core holder is sized to receive and maintain a core rock sample at a desired pressure and temperature. The second portions of each of the piston cells are fluidly connected to the core holder.

A fatigue limit stress specification system includes: a vibration generator that repeatedly applies a load to an object to be measured; a temperature sensor that measures a change in temperature of the object to be measured; and an information processing device that measures a fatigue limit stress of the object to be measured. The information processing device obtains a relation between a temperature amplitude of a fundamental frequency component of vibration for the object to be measured and a temperature amplitude of a second harmonic component of the vibration, performs fitting on the relation by using a first approximate line and a second approximate line, the first approximate line including a quadratic curve, the second approximate line including a quadratic curve, and obtains the fatigue limit stress of the object to be measured based on an intersection of the first approximate line and the second approximate line.

A test fixture for securing a test article is disclosed. The test fixture includes a frame, an upper grip, at least one heat shield, a cooling assembly, and insulation. The frame defines an upper portion and a lower portion. The lower portion of the frame is releasably mounted to a vibration device. The upper grip is connected to the upper portion of the frame and the lower grip is connected to the lower portion of the frame. The heat shield is positioned to insulate at least one of the upper grip and the lower grip. The upper grip is configured to secure an upper portion of the test article along an upper interface. The lower grip is configured to secure a lower portion of the test article along a lower interface. The cooling assembly transports a cooling medium across at least one of the upper interface and the lower interface.

A device for measuring shear properties of asphalt mixtures includes a machine for testing the material strength, equipped with an operational frame, fixing elements and driving mechanism, the machine including a steel socket equipped at at least one of a bottom and a top edge thereof with an inner flange to accommodate a testing specimen, the testing specimen having a central open hole, and a steel insert adapted to be inserted into the open hole in the testing specimen, the steel insert being equipped with a rim at at least one of an end thereof at the top edge of the steel socket and at end thereof at the bottom of the steel socket, while a size of a clearance between the inner flange and the rim being between 5 to 60 mm, and the steel insert being equipped with elements for fixing to clamping elements of the device, and measuring probes being connected to the steel insert.

A shear testing system and method of thermo-seepage-mechanical field and engineering disturbance coupling under deep and complex condition are provided. The shear testing system can be used in conjunction with an axial pressure application device to simplify the structure, save costs, and facilitate a triaxial confining pressuretemperatureaxial pressuretorsional shear coupled test on a rock specimen. The shear testing system can achieve the following three purposes. First, the shear testing system can convert an axial pressure into a torsional shear force through a transmission mechanism of a power conversion assembly. Second, the shear testing system can apply an axial pressure to the rock specimen fixed between two specimen fixing heads, through a pressure shaft of an axial pressure mechanism. Third, the shear testing system can apply a triaxial confining pressure and a temperature field to the rock specimen.

An apparatus and method for determining time-dependence failure under constant temperature through high pressure true triaxial loading for hard rock, includes a pressure chamber and four actuators, wherein a sample bearing platform is arranged in a center of the pressure chamber, a sample bearing and containing chamber is arranged in a center of the sample bearing platform, and a confining pressure loading oil supply hole is formed in the sample bearing platform, and communicates with a confining pressure loading injection pump; each actuator includes a sealing cover, an annular end cover, a counter-force cylinder barrel, a piston, a piston rod, a sealing flange and a stress loading injection pump; a heating coil is arranged in the pressure chamber; a force sensor is fixedly mounted at the end part of the piston rod; and a pressure sensor is mounted in the sample bearing platform.

Embodiments relate to an apparatus and method for determining the complex shear modulus of compliant viscoelastic specimens. The apparatus comprises at least one magnet configured to provide a magnetic field; a specimen and a motor secured to the end of the specimen, wherein the motor is positioned proximate to the magnet such that the motor is in the magnetic field; a first coil fixed to the motor; an amplifier configured to provide a current in the first coil, such that the first coil interacts with the magnetic field and the current to apply a force to the specimen; a second coil fixed to the motor and configured to measure voltage; a mirror secured to the motor; a laser source focused on the mirror and configured to produce a laser, such that the mirror reflects the laser; and a photodetector configured to detect the laser reflected from the mirror.

A test fixture for securing a test article is disclosed. The test fixture comprises a frame, an upper grip, a lower grip, a tensioner assembly, and a cooling assembly. The frame defines an upper portion and a lower portion, where the lower portion of the frame is configured to be releasably mounted to a vibration device. The upper grip is connected to the upper portion of the frame and the lower grip is connected to the lower portion of the frame. The upper grip is configured to secure an upper portion of the test article along an upper interface, and the lower grip is configured to secure a lower portion of the test article along a lower interface. The tensioner assembly is located at the upper portion of the test fixture. The cooling assembly transports a cooling medium across at least one of the upper interface and the lower interface.