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以国际单位制表示的数值应视为标准。括号中给出的值仅供参考。 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和健康实践，并确定监管限制的适用性。 ====意义和用途====== 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。 该程序已在美国有限的地理区域内使用，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。 6. , 7. 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。 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。 6. 尽管该方法的应用仅限于特定施工用途的骨料，但仍有可能扩大该方法的应用范围，以控制其他施工领域中使用的骨料的质量，例如用于沥青铺路混合料的骨料、用于波特兰的粗骨料- 用作铁路道砟的水泥混凝土和骨料。

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 The values stated in SI units are to be regarded as the standard. The values given in parentheses are for information only. 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 and health practices and determine the applicability of regulatory limitations prior to use. ====== Significance And Use ====== 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. 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. 6 , 7 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. 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. 6 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.