1.1 本试验方法包括使用流动流数字分析仪测定路面标线系统中使用的玻璃球的级配（尺寸分布）。AASHTO M247-08中定义了路面标线系统的典型等级，范围从0型到5型。 1.2 本试验方法提供了各种格式的尺寸数据，以满足机构路面标线材料规范的要求。对于大多数规格，标准格式是将尺寸数据表示为相对于一系列标准美国筛网尺寸的“保留百分比”或“通过百分比”。 1.3 以国际单位制表示的数值应视为标准值。本标准不包括其他计量单位。 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 玻璃微珠的级配（尺寸分布）对路面标线系统的反光效率有重大影响。 5.2 本试验方法用于表征玻璃微珠的级配（尺寸分布），以便根据路面标线应用中玻璃微珠的标准规范进行符合性试验。 5.3 虽然本试验方法在测量路面标线玻璃微珠的级配（尺寸分布）之外还有潜在的工业应用，但这些都超出了本标准的范围。

1.1 This test method covers the determination of the gradation (size distribution) of glass spheres used in pavement marking systems using a Flowing Stream Digital Analyzer. Typical gradations for pavement marking systems are defined in ranges from Type 0 through 5 in AASHTO M247-08. 1.2 This test method provides for the presentation of the size data in a variety of formats to the requirements of the agency pavement marking material specification. For most specifications the standard format is to present the size data as “Percent Retained” or “Percent Passing” relative to a series of standard US sieve sizes. 1.3 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard. 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 The gradation (size distribution) of glass beads has a significant influence on the retroreflective efficiency of a pavement marking system. 5.2 This test method is for the characterization of the gradation (size distribution) of glass beads for the purpose of compliance testing against standard specification for glass beads in pavement marking applications. 5.3 While there are potential industrial applications for this test method beyond the measurement of gradation (size distribution) of glass beads for pavement markings, those are beyond the scope of this standard.