ASTM C29/C29M-16 pdf free download.SUMMARY OF CHANGES.
4.3 A procedure is included for computing the percentage of voids between the aggregate particles based on the hulk density determined by this test method.
5. Apparatus
5.1 Balance—A balance or scale accurate within 0.1 % of the test load at any point within the range of use, graduated to at least 0.05 kg [0.1 Ib]. The range of use shall be considered to extend from the mass of the measure empty to the mass of the measure plus its contents at 1920 kg/m3 [120 lb/ft3].
5.2 Tainping Rod—A round, straight steel rod, 16 mm [5/s in.] in diameter and approximately 600 mm [24 in.] in length. having the tamping end, or both ends, rounded to a hemispherical tip, the diameter of which is 16 mm [5/s in.].
5.3 Measure—A cylindrical metal measure, preferably provided with handles. It shall be watertight, with the top and bottom true and even, and sufficiently rigid to retain its form under rough usage. The measure shall have a height approximately equal to the diameter, but in no case shall the height be less than 80 % nor more than 150 % of the diameter. The capacity of the measure shall conform to the limits in Table I for the aggregate size to be tested. The thickness of metal in the measure shall be as described in Table 2. The top rim shall be smooh and plane within 0.25 mm [0.01 in.] and shall be parallel to the bottom within 0.5° (See Note 2). The interior wall of the measure shall be a smooth and continuous surface.
Note 2—The top rim is satisfactorily plane if a 0.25-mm [0.01-in.] feeler gage cannot be inserted between the rim and a piece of 6-mm [¼-in.] or thicker plate glass laid over the measure. The (op and bottom are satisfactorily parallel if the slope between pieces of plae glass in contact with the top and bouom does no exceed 0.87 % in any direction.
5.3.1 If the measure is to also be used for testing for bulk density of freshly-mixed concrete according to Test Method Cl38/C138M, the measure shall he made of steel or other suitable metal not readily subject to attack by cement paste. Reactive materials, such as aluminum alloys are permitted, where as a consequence of an initial reaction, a surface film is formed which protects the metal against further corrosion.
5.3.2 Measures larger than nominal 28L capacity shall be made of steel for rigidity, or the minimum thicknesses of metal listed in Table 2 shall be suitably increased.ASTM C29/C29M pdf download.