ASTM C29/C29M:16 pdf free download – Standard Test Method for Bulk Density (“Unit Weight”) and Voids in Aggregate.
9. Selection of Procedure
9. 1 The shoveling procedure for loose bulk density shall he used only when specifically stipulated. Otherwise, the compact bulk density shall be determined by the rodding procedure for aggregates having a nominal maximum size of 37.5 mm LI ½ in.1 or less, or by the jigging procedure for aggregates having a nominal maximum size greater than 37.5 mm [1½ in.] and not exceeding 125 mm [5 in.].
10. Rodding Procedure
10.1 Fill the measure one-third full and level the surface with the fingers. Rod the layer of aggregate with 25 strokes of the tamping rod evenly distributed over the surface. Fill the measure two-thirds full and again level and rod as above. Finally, fill the measure to overflowing and rod again in the manner previously mentioned. Level the surface of the aggregate with the fingers or a straightedge in such a way that any slight projections of the larger pieces of the coarse aggregate approximately balance the larger voids in the surface below the top of the measure.
10.2 In rodding the first layer, do not allow the rod to strike the bottom of the measure forcibly. In rodding the second and third layers, use vigorous effort, hut not more force than to cause the tamping rod to penetrate to the previous layer of aggregate.
NOTE 4—In rodding the larger sizes of coarse aggregate, it may not be possible to penetrate the layer being consolidated, especially with angular aggregates. The intent of the procedure will be accomplished if vigorous effort is used.
10.3 Determine the mass of the measure plus its contents, and the mass of the measure alone, and record the values to the nearest 0.05 kg [0.1 Ib].
11. Jigging Procedure
11.1 Fill the measure in three approximately equal layers as described in 10.1. compacting each layer by placing the measure on a firm base, such as a cement-concrete floor, raising the opposite sides alternately about 50 mm [2 in.1, and allowing the measure to drop in such a manner as to hit with a sharp, slapping blow. The aggregate particles, by this procedure. will arrange themselves in a densely compacted condition. Compact each layer by dropping the measure 50 times in the manner described. 25 times on each side. Level the surface of the aggregate with the fingers or a straightedge in such a way that any slight projections of the larger pieces of the coarse aggregate approximately balance the larger voids in the surface below the top of the measure.
11 .2 Determine the mass of the measure plus its contents. and the mass of the measure alone, and record the values to the nearest 0.05 kg [0.1 Ib].