Void Content Apparatus, Coarse Aggregates

Used to determine the void content of uncompacted coarse aggregate used in HMA applications. When used on aggregate of a known size, the void content provides the user with an indication of the angularity, sphericity and surface texture as compared to other course aggregate of the same grading. In operation, the aggregate is allowed to free-fall 115mm from the funnel bottom into a 154mm diameter by 160mm high cylindrical measure. The excess heaped aggregate is struck off using the included bar, the mass is measured, and the void content is computed. The apparatus consists of a stainless steel hopper, stand, measure and strike-off bar and a 170mm square glass plate for calibration of the measure.