The MS-45 Semi-Circular Bend (SCB) Test Fixture determines the low temperature fracture energy and toughness of asphalt mixtures with a maximum aggregate size of 19mm. The semi-circular asphalt specimens are easily cut from SuperpaveTM gyratory compacted cylinders or field cores with a diameter of 150 mm.
The test fixture is mounted in a Marshall Stability Load Frame such as the MS-86 or MS-398 for loading. A specimen is positioned with the flat side on two rollers and a load is applied along the vertical diameter of the specimen. The load and displacement are measured to calculate fracture energy, stiffness and fracture toughness.
The SCB Test Fixture consists of a 1/2in (12.7mm) thick steel base plate, two L-shaped roller support steel blocks, two steel rollers, and a U-shaped frame. The loading fixture has Polytetrafluoroethylene strips to minimize friction. Initial roller position is maintained by soft springs and backstops, which establish the test span dimensions.
- Determines low temperature fracture energy and toughness of asphalt mixtures with a maximum aggregate size of 19mm
- Uses Polytetrafluoroethylene strips to minimize friction
- Features soft springs and backstops to maintain roller position and establish test span dimensions
- MS-45 Semi-Circular Bend Test Fixture