1.1 本试验方法包括通过筛分测定细骨料和粗骨料的粒度分布。 1.2 参考本试验方法的一些骨料规范包含级配要求，包括粗粒级和细粒级。包括此类骨料的筛分分析说明。 1.3 单位- 以国际单位制或英寸-磅单位表示的数值应单独视为标准值。每个系统中规定的值可能不是精确的等效值；因此，每个系统应相互独立使用。将两个系统的值合并可能会导致不符合标准。 注1: 筛孔尺寸由规范中的标准名称确定 E11 . 括号中给出的替代名称仅供参考，并不代表不同的标准筛孔尺寸。 规格 E11 引用以下关于国际单位制与英寸磅单位的标准。“以国际单位制表示的数值应被视为筛网开口尺寸和筛网中使用的钢丝直径的标准值。以英寸-磅单位表示的数值应被视为筛框、平底锅和盖子的标准值。”。 1.4 本标准并非旨在解决与其使用相关的所有安全问题（如有）。本标准的用户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。 1.5 本国际标准是根据世界贸易组织技术性贸易壁垒（TBT）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》中确立的国际公认标准化原则制定的。 ====意义和用途====== 5.1 本试验方法主要用于确定拟用作骨料或用作骨料的材料的级配。结果用于确定粒度分布是否符合适用规范要求，并为控制各种骨料产品和含有骨料的混合物的生产提供必要数据。这些数据也可能有助于建立有关孔隙度和充填的关系。 5.2 仅使用本试验方法无法准确测定比75μm（200号）筛细的材料。使用测试方法 C117型 用于通过洗涤测定比75μm（200号）筛细的材料。 5.3 参考规范中的采样和测试方法 C637 对于重型骨料。

1.1 This test method covers the determination of the particle size distribution of fine and coarse aggregates by sieving. 1.2 Some specifications for aggregates which reference this test method contain grading requirements including both coarse and fine fractions. Instructions are included for sieve analysis of such aggregates. 1.3 Units— The values stated in either SI units or inch-pound units are to be regarded separately as standard. 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. Note 1: Sieve size is identified by its standard designation in Specification E11 . The alternative designation given in parentheses is for information only and does not represent a different standard sieve size. Specification E11 cites the following with respect to SI units versus inch-pound units as standard. “The values stated in SI units shall be considered standard for the dimensions of the sieve cloth openings and the wire diameters used in the sieve cloth. The values stated in inch-pound units shall be considered standard with regard to the sieve frames, pans,” and covers. 1.4 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. 1.5 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 ====== 5.1 This test method is used primarily to determine the grading of materials proposed for use as aggregates or being used as aggregates. The results are used to determine compliance of the particle size distribution with applicable specification requirements and to provide necessary data for control of the production of various aggregate products and mixtures containing aggregates. The data may also be useful in developing relationships concerning porosity and packing. 5.2 Accurate determination of material finer than the 75-μm (No. 200) sieve cannot be achieved by use of this test method alone. Use Test Method C117 for determination of material finer than the 75-μm (No. 200) sieve by washing. 5.3 Refer to methods of sampling and testing in Specification C637 for heavyweight aggregates.