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The Semi-Circular Bend (SCB) Test Fixture is used to calculate the fracture energy of asphalt mixtures (maximum aggregate size of 19mm) from a load-displacement curve. Semicircular samples are cut from Superpave Gyratory compacted cylinders or 150mm field cores.
The SCB Test Fixture consists of a 0.5in (12.7mm) thick steel base plate, two L-shaped roller support steel blocks, two steel rollers, a loading ball, and a U-shaped frame. The test fixture is mounted for loading in a Marshall Stability Testers.
A specimen is positioned with the flat side on two rollers and a load applied along the vertical diameter of the specimen. Load and displacement are measured to calculate test results. The initial roller position is maintained by soft springs and backstops, which establish the test span dimension.
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