c9/c29M - 16 SUMMARY OF CHANGES
achieved in this test method is unknown. Further, aggregates inhauling units and stockpiles usually contain absorbed andsurface moisture (the latter affecting bulking). while this testmethod determines the bulk density on a dry basis.
4.3 A procedure is included for computing the pcrcentage ofvoids between the aggregate particles based on the bulk densitydctermined by this test method.
5. Apparatus
5.1 Balance—A balance or scale accurate within 0.1 % ofthe test load at any point within the range of use, graduated toat least 0.05 kg [0.I lb]. The range of use shall be consideredto extend from the mass of the measure empty to the mass ofthe measure plus its contents at 1920 kg/m3 [120 lb/n'].
5.2 Tamping Rod—A round,straight steel rod,16 mm[5Wsin.] in diameter and approximately 600 mm [24 in. ] in length,having the tamping end, or both ends, rounded to a hemispheri-cal tip, the diameler of which is 16 mm [5/% in.].
5.3 Measure——A cylindrical metal measure, preferably pro-vided with handles. It shall be watertight，with the top andbottom true and even. and sufficiently rigid to retain its formunder rough usage.The measure shall have a height approxi-mately equal to the diameter. but in no case shall the height beless than 80 % nor more than 150 % of the diameter. Thecapacity of the measure shall conform to the limits in Table lfor the aggregate size to be tested.The thickness of metal in themeasure shall be as described in Table 2.The top rim shall besmooth and plane within 0.25 mm [0.0l in.] and shall beparallel to the bottom within 0.5°(See Note 2). The interiorwall of the measure shall be a smooth and continuous surface.Non 2—The top rim is satisfactorily plane if a 0.25-mm [0.O1-in.]feeler gage_ cannon be inserted betweerni the rim and a piece of 6-mm[ ya-in.] or thicker plate glass laid over the measure. The top and bottomare satisfactorily parallel if the slope betwecn pieces of platc glass incontac with the top and boliom does nof exceed 0.87 % in any direction.5.3.1 If the measure is to also be used for testing for bulkdensity of freshly-mixed concrete according to Test MethodC138/C138M. the measure shall be made of steel or othersuitable 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 isformed which protects the metal against further corrosion.5.3.2 Measures larger than nominal 28 L[ ft] capacityshall be made of steel for rigidity, or the minimum thicknessesof metal listed in Table 2 shall be suitably increased.文章源自标准下载网-https://www.biao-zhun.cn/118327.html
SUMMARY OF CHANGES
