The SG-42 apparatus is a scaled-up device and procedure similar to that used for the evaluation of fine aggregate. The test is recommended to evaluate aggregates for Hot-Mix Asphalt (HMA) pavement. Gradation and void content data provide an indication of angularity, sphericity and surface texture that can be related to permanent deformation and fatigue cracking of asphalt. Aggregate is allowed to free fall from the hopper into a cylindrical measure. Excess heaped aggregate is struck off using the included bar, the mass is measured, and void content is computed. The hopper, stand and measure are stainless steel and a locator pin and circle on the bottom plate of the stand make it easy to center the measure below the hopper.
- Accurate measure of uncompacted void content of coarse aggregate
- Meets AASTO T 326
- Locator pin and circle offer centering of the measure below the hopper
- Coarse Aggregate Angularity Apparatus
- Strike-off Bar
- Glass Plate for calibration