1.1 本试验方法包括测定压实或松散条件下骨料的堆积密度（“单位重量”），以及基于相同测定结果计算细骨料、粗骨料或混合骨料中颗粒之间的空隙。本试验方法适用于标称最大尺寸不超过125 mm[5 in.]的骨料。 注1: 单位重量是用于描述通过该测试方法确定的特性的传统术语，即单位体积的重量（更准确地说，单位体积或密度的质量）。 1.2 以SI单位或英寸磅单位表示的值应单独视为标准，适用于使用该试验方法的规范。骨料的筛网尺寸和标称尺寸除外，其中SI值为规范中规定的标准 E11 .在文本中，英寸- 括号中显示了磅单位。每个系统中规定的值可能不是完全相等的；因此，每个系统应独立使用。将两个系统的值合并可能导致不符合标准。 1.3 本标准并非旨在解决与其使用相关的所有安全问题（如有）。本标准的使用者有责任在使用前制定适当的安全、健康和环境实践，并确定监管限制的适用性。 1.4 本国际标准是根据世界贸易组织技术性贸易壁垒委员会发布的《关于制定国际标准、指南和建议的原则的决定》中确立的国际公认的标准化原则制定的。 ===意义和用途====== 4.1 该试验方法通常用于确定体积密度值，这对于选择混凝土混合物比例的许多方法来说是必要的。 4.2 体积密度也可用于确定购买协议中转换的质量/体积关系。然而，运输装置或料堆中骨料的压实度与本试验方法中获得的压实度之间的关系尚不清楚。此外，运输装置和料堆中的骨料通常含有吸收的水分和表面水分（后者影响膨胀），而该试验方法在干燥的基础上确定堆积密度。 4.3 包括一个程序，用于根据该试验方法确定的堆积密度计算骨料颗粒之间的空隙百分比。

1.1 This test method covers the determination of bulk density (“unit weight”) of aggregate in a compacted or loose condition, and calculated voids between particles in fine, coarse, or mixed aggregates based on the same determination. This test method is applicable to aggregates not exceeding 125 mm [5 in.] in nominal maximum size. Note 1: Unit weight is the traditional terminology used to describe the property determined by this test method, which is weight per unit volume (more correctly, mass per unit volume or density). 1.2 The values stated in either SI units or inch-pound units are to be regarded separately as standard, as appropriate for a specification with which this test method is used. An exception is with regard to sieve sizes and nominal size of aggregate, in which the SI values are the standard as stated in Specification E11 . Within the text, inch-pound units are shown in brackets. The values stated in each system may not be exact equivalents; therefore, each system shall be used independently of the other. Combining values from the two systems may result in non-conformance with the standard. 1.3 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use. 1.4 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee. ====== Significance And Use ====== 4.1 This test method is often used to determine bulk density values that are necessary for use for many methods of selecting proportions for concrete mixtures. 4.2 The bulk density also may be used for determining mass/volume relationships for conversions in purchase agreements. However, the relationship between degree of compaction of aggregates in a hauling unit or stockpile and that achieved in this test method is unknown. Further, aggregates in hauling units and stockpiles usually contain absorbed and surface moisture (the latter affecting bulking), while this test method determines the bulk density on a dry basis. 4.3 A procedure is included for computing the percentage of voids between the aggregate particles based on the bulk density determined by this test method.