1.1 本试验方法包括测定骨料的耐久性指数。计算的耐久性指数是一个值，表示骨料在受到规定的机械降解方法影响时，对产生有害粘土状细骨料的相对阻力。 1.2 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。 1.2.1 体积和质量的测量仅以国际单位制为单位，因为它们是实施本试验方法时在实践中通常使用的唯一单位。 1.2.2 截面测量 11 部分 15 , 等式3 , 等式4 表1仅以英寸-磅单位给出，因为这些章节中使用的设备仅使用英寸-磅系统制造。 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。 1.4 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====== 4.1 本试验方法为骨料在受到机械降解时可能产生的类粘土材料的相对数量、细度和特性指定了一个经验值。 4.2 该程序已用于美国有限的地理区域，其结果与各种施工应用中的骨料性能相关，包括:骨料基层、回填用渗透材料、细混凝土骨料和岩石边坡防护用抛石。 3. , 4. 4.3 允许规定最低耐久性指数，以禁止在各种施工应用中使用易降解的骨料，从而产生粘土- 比如罚款。 4.4 该测试方法为评估新骨料来源的质量提供了快速测试。研究表明，它也可以代替硫酸钠坚固性试验，用于评估硅酸盐水泥混凝土中使用的细骨料的耐久性特征，从而减少耗时和昂贵的坚固性试验的需要。 3. 4.5 虽然该方法的应用仅限于特定施工用途的骨料，但有可能扩大该方法的应用范围，以控制其他施工领域使用的骨料的质量，例如用于沥青铺路混合物的骨料、用于波特兰水泥混凝土的粗骨料和用作铁路道碴的骨料。 注1: 本试验方法的文本参考了提供解释材料的注释和脚注。这些注释和脚注（不包括表和图中的注释和脚注）不应视为试验方法的要求。 注2: 本标准产生的结果质量取决于执行程序的人员的能力以及所用设备的能力、校准和维护。符合规范标准的机构 D3666 通常认为能够胜任和客观的测试、抽样、检查等。本标准的用户应注意遵守规范 D3666 单独使用并不能完全确保可靠的结果。可靠的结果取决于许多因素；遵循规范建议 D3666 或一些类似的可接受指南提供了评估和控制其中一些因素的方法。

1.1 This test method covers the determination of a durability index of an aggregate. The calculated durability index is a value indicating the relative resistance of an aggregate to production of detrimental clay-like fines when subjected to the prescribed mechanical methods of degradation. 1.2 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 nonconformance with the standard. 1.2.1 Measurements of volume and mass are only given in SI units because they are the only units typically used in practice when performing this test method. 1.2.2 Measurements in Section 11 , Section 15 , Eq 3 , Eq 4 , and Table 1 are only given in inch-pound units because the equipment used in these sections is only manufactured using the inch-pound system. 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 assigns an empirical value to the relative amount, fineness, and character of clay-like material that may be generated in an aggregate when subjected to mechanical degradation. 4.2 The procedure has been used in limited geographical areas of the United States, and the results have been correlated with aggregate performance in various construction applications, including: aggregate base, permeable material for backfill, fine concrete aggregate, and riprap for rock slope protection. 3 , 4 4.3 A minimum durability index is permitted to be specified to prohibit the use of an aggregate in various construction applications that is prone to degradation, resulting in generation of clay-like fines. 4.4 This test method provides a rapid test for evaluation of the quality of a new aggregate source. Research has indicated it may also be suitable for use instead of the sodium sulfate soundness test for evaluating the durability characteristics of fine aggregate for use in portland cement concrete, thereby reducing the need for time-consuming and expensive soundness tests. 3 4.5 Although the application of this method has been limited to aggregates for specific construction uses, the possibility exists for expanding the application of this method to control the quality of aggregates used in other areas of construction, such as aggregates for use in bituminous paving mixtures, coarse aggregate for use in portland cement concrete, and aggregate for use as railroad ballast. Note 1: The text of this test method references notes and footnotes which provide explanatory material. These notes and footnotes (excluding those in tables and figures) shall not be considered as requirements of the test method. Note 2: The quality of the results produced by this standard are dependent on the competence of the personnel performing the procedure and the capability, calibration, and maintenance of the equipment used. Agencies that meet the criteria of Specification D3666 are generally considered capable of competent and objective testing, sampling, inspection, etc. Users of this standard are cautioned that compliance with Specification D3666 alone does not completely ensure reliable results. Reliable results depend on many factors; following the suggestions of Specification D3666 or some similar acceptable guideline provides a means of evaluating and controlling some of those factors.