The Semi-Circular Bend (SCB) Test Fixture is used in Marshall Stability Load Frames to determine low-temperature fracture energy and toughness of asphalt mixtures with a maximum aggregate size of 19mm. Semicircular asphalt specimens are easily cut from Superpave Gyratory compacted cylinders or field cores with 150 mm diameter.
The Fixture features a 0.5in (12.7mm) thick steel base plate, two L-shaped roller support steel blocks, two steel rollers, and a U-shaped frame. It is mounted in a Marshall Load Frame such as Karol-Warner’s 7690 or 7691 for loading.
The SCB sample is positioned on the two rollers and loaded along its vertical diameter. Load and displacement are measured to calculate test results. Polytetrafluoroethylene strips minimize friction of the loading fixture.
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