1.1 这些试验方法包括天然和人造抛石及相关材料（包括滤石或粗垫层材料）的粒度和质量分析。 1.2 这些试验方法通常适用于抛石和相关材料。它们适用于从天然沉积物、爆破岩石、采石加工材料或再生混凝土中筛选出的石头混合物。它们适用于3英寸的尺寸。（75 mm）及以上，上限尺寸仅由可用于处理和测定单个颗粒质量的设备限制。 1.3 提供了四种替代程序。测试程序的努力程度和精度范围很大。 对于说明符来说，指示测试程序很重要。测试报告应明确说明使用了哪种程序。 注1: 在进行这些试验方法时，可以方便地收集其他属性的数据，例如板件和有害物质的数量。 1.4 所有观察值和计算值应符合实践中确定的有效数字和舍入准则 D6026 ，除非被本标准取代。 1.4.1 为了将测量值或计算值与规定限值进行比较，测量值或计算值应四舍五入至规定限值中最接近的小数或有效数字。 1. 4.2 本标准中用于规定如何收集/记录或计算数据的程序被视为行业标准。此外，它们代表了通常应保留的有效数字。使用的程序不考虑材料变化、获取数据的目的、特殊目的研究或用户目标的任何考虑因素；通常的做法是增加或减少报告数据的有效位数，以与这些考虑因素相称。考虑工程设计分析方法中使用的有效数字超出了本标准的范围。 1.5 以英寸表示的值- 磅单位应视为标准。括号中给出的值是到国际单位制的数学转换，仅供参考，不被视为标准值。 1.6 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。 第节给出了具体的预防说明 7. . ====意义和用途====== 5.1 抛石通常用于防止雨水径流、风、流水或波浪作用对底层材料的侵蚀。 如指南中所述，粒径分布（颗粒质量）是抛石的一个重要物理特性 D6825 . 这些试验方法提供了材料的级配，用图形表示为比颗粒质量细的百分比。如果可以仅根据最大和最小粒径确定或接受级配，则可能没有必要根据这些试验方法确定完整的级配。 5.2 这些测试方法可在评估潜在来源期间使用，作为产品验收的手段，或用于评估现有装置。不建议将方法D作为产品验收的手段。 5.3 在执行这些试验方法的过程中，可以确定其他感兴趣的特征，例如颗粒形状、颗粒棱角度或视觉上明显的岩石耐久性特征。 5.4 测试结果的解释必须考虑样品的代表性。 注2: 本标准产生的结果的质量取决于执行该标准的人员的能力，以及所用设备和设施的适用性。符合实践标准的机构 D3740 通常认为能够胜任和客观的测试/采样/检查等。本标准的用户应注意遵守惯例 D3740 本身不能确保可靠的结果。可靠的结果取决于许多因素；实践 D3740 提供了一种评估其中一些因素的方法。

1.1 These test methods cover the particle size and mass analysis of natural and man-made riprap and related materials, including filter stone or coarse bedding materials. 1.2 These test methods are generally intended for riprap and related materials. They are applicable for mixtures of stones screened from natural deposits, blast rock, processed materials from quarried rock, or recycled concrete. They are applicable for sizes 3 in. (75 mm) and above, with the upper size limited only by equipment available for handling and determining the mass of the individual particles. 1.3 Four alternate procedures are provided. There is a wide range in the level of effort and the precision of the test procedures. It is important for specifiers to indicate the test procedure. Test reports should clearly indicate which procedure was used. Note 1: While conducting these test methods, it may be convenient to collect data on other attributes, such as the amount of slab pieces and deleterious materials. 1.4 All observed and calculated values shall conform to the guidelines for significant digits and rounding established in Practice D6026 , unless superseded by this standard. 1.4.1 For purposes of comparing measured or calculated value(s) with specified limits, the measured or calculated value(s) shall be rounded to the nearest decimal or significant digits in the specified limits. 1.4.2 The procedures used to specify how data are collected/recorded or calculated, in this standard are regarded as the industry standard. In addition, they are representative of the significant digits that generally should be retained. The procedures used do not consider material variation, purpose for obtaining the data, special purpose studies, or any considerations for the user’s objectives; and it is common practice to increase or reduce significant digits of reported data to be commensurate with these considerations. It is beyond the scope of this standard to consider significant digits used in analytical methods for engineering design. 1.5 The values stated in inch-pound units are to be regarded as the standard. The values given in parentheses are mathematical conversions to SI units that are provided for information only and are not considered standard. 1.6 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. Specific precautionary statements are given in Section 7 . ====== Significance And Use ====== 5.1 Riprap is commonly used to prevent erosion of underlying materials due to the effects of rain runoff, wind, flowing water, or wave action. The particle size distribution (mass of particles) is an important physical characteristic of riprap, as discussed in Guide D6825 . These test methods provide a gradation of the material graphically represented as percent finer than the particle mass. If a gradation can be established or accepted on the basis of only maximum and minimum particle sizes, then it may not be necessary to establish the complete gradation in accordance with these test methods. 5.2 These test methods can be used during evaluation of a potential source, as a means of product acceptance, or for assessment of existing installations. Method D is not recommended as a means of product acceptance. 5.3 Other characteristics of interest, such as particle shape, particle angularity, or visually evident rock durability characteristics may be determined during the performance of these test methods. 5.4 Interpretation of test results must consider the representativeness of the sample. Note 2: The quality of the result produced by this standard is dependent upon the competence of the personnel performing it, and the suitability of the equipment and facilities used. Agencies that meet the criteria of Practice D3740 are generally considered capable of competent and objective testing/sampling/inspection/etc. Users of this standard are cautioned that compliance with Practice D3740 does not in itself ensure reliable results. Reliable results depend on many factors; Practice D3740 provides a means of evaluating some of those factors.