1.1 该试验方法包括用于侵蚀控制的岩石比重和吸收的测定。比重可以表示为体积比重或表观比重。体积比重和吸收基于24 ± 测试岩石样品的4小时浸泡时间。该试验适用于防波堤石、护面石、抛石和石笼大小的岩石材料或类似材料。 1.2 再生混凝土和其他材料的使用超出了本试验方法的范围。 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。 每个系统中规定的值可能不是完全相等的；因此，每个系统应独立使用。将两个系统的值结合起来可能会导致不符合标准。 1.3.1 处理英寸磅单位时使用英寸磅单位的重力系统。在该系统中，磅（lbf）表示力（重量）的单位，而质量的单位是蛞蝓。除非涉及动态（F=ma）计算，否则未给出段塞单元。 1.3.2 工程/建筑行业的常见做法是同时使用磅来表示质量单位（lbm）和力单位（lbf）。 这种做法隐含地结合了两个独立的单位系统；绝对系统和引力系统。在一个标准中同时使用两套独立的英寸磅单位在科学上是不可取的。如前所述，本标准包括英寸磅单位的重力系统，不使用/表示弹塞质量单位。但是，使用天平和天平记录质量磅（lbm）不应被视为不符合本标准。 1.4 所有观测值和计算值应符合实践中制定的有效数字和四舍五入指南 D6026 ，除非被本标准取代。 1.4.1 为了将测量或计算值与规定限值进行比较，测量或计算的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。所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；并且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 本标准并不旨在解决与其使用相关的所有安全问题（如有）。本标准的使用者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。 1.6 本国际标准是根据世界贸易组织技术性贸易壁垒委员会发布的《关于制定国际标准、指南和建议的原则的决定》中确立的国际公认的标准化原则制定的。 ====意义和用途====== 5.1 用于侵蚀控制的岩石由放置在建设项目、海岸线、河床、桥台、桩和其他结构上的天然岩石组成，以最大限度地减少侵蚀的影响。岩石抵抗风化变质的能力影响项目的有效性及其成本。岩石的比重和吸收率提供了有用的信息，可用于评估岩石的耐久性及其对水运动的抵抗力。 5.2 岩石对水的吸收可能会影响其在冷冻条件和盐结晶条件下的耐久性。 此外，吸收试验已被用作指标试验，以确定是否需要额外的试验来评估岩石的耐久性。 5.3 与拟议设计尺寸相等的试样将在实验室试验和实际现场性能之间提供最佳相关性，但这通常既不实用，也不经济可行。 5.4 这些试验的结果不能作为确定岩石耐久性的唯一依据，应与其他试验的结果一起使用。 5.5 这些测试方法已被用于评估不同类型的岩石。在极少数情况下，测试结果提供的数据与实际现场条件下岩石的耐久性不一致。 例如，一些吸收值低的岩石在实际使用中已经破碎，而一些吸收值高的岩石已经被证明是耐用的。 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 通常被认为有能力进行合格和客观的测试/取样/检查等。本标准的用户应注意遵守实践 D3740 其本身不能保证可靠的结果。可靠的结果取决于许多因素； 实践 D3740 提供了评估其中一些因素的方法。

1.1 This test method covers the determination of specific gravity and absorption of rock for erosion control. The specific gravity may be expressed as bulk specific gravity or apparent specific gravity. Bulk specific gravity and absorption are based on a 24 ± 4-h soaking time for the rock specimens tested. This test is appropriate for breakwater stone, armor stone, riprap, and gabion sized rock materials, or similar. 1.2 The use of reclaimed concrete and other materials is beyond the scope of this test method. 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 nonconformance with the standard. 1.3.1 The gravitational system of inch-pound units is used when dealing with inch-pound units. In the system, the pound (lbf) represents a unit of force (weight), while the units for mass is slugs. The slug unit is not given, unless dynamic (F = ma) calculations are involved. 1.3.2 It is common practice in the engineering/construction profession to concurrently use pounds to represent both a unit of mass (lbm) and of force (lbf). This practice implicitly combines two separate systems of units; the absolute and the gravitational systems. It is scientifically undesirable to combine the use of two separate sets of inch-pound units within a single standard. As stated, this standard includes the gravitational system of inch-pound units and does not use/present the slug unit of mass. However, the use of balances and scales recording pounds of mass (lbm) shall not be regarded as nonconformance with this standard. 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 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. 1.6 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 Rock for erosion control is composed of pieces of natural rock that are placed on construction projects, shorelines, streambeds, bridge abutments, pilings, and other structures to minimize the effects of erosion. The ability of rock to withstand deterioration from weathering affects both the effectiveness of the project and its cost. The specific gravity and absorption of rock provide useful information that can be used in evaluating the durability of the rock as well as its resistance to movement by water. 5.2 The absorption of water into rock may affect its durability under freezing conditions and salt crystallization conditions. In addition, the absorption test has been used as an index test in determining whether additional tests are needed to evaluate the durability of a rock. 5.3 Test specimens equal in size to the proposed design size would provide the best correlations between laboratory tests and actual field performance, however this is usually neither practical nor economically feasible. 5.4 The results of these tests are not to be used as the sole basis for determination of rock durability, and shall be used in conjunction with the results of other tests. 5.5 These test methods have been used to evaluate different types of rocks. There have been rare occasions when test results have provided data that have not agreed with the durability of rock under actual field conditions. For example, some rocks with low absorption values have fragmented in actual usage and some with high absorption values have proven to be durable. Note 2: The quality of the result produced by this standard is dependent on the competence of the personnel performing it, and the suitability of the equipment and facilities used. Agencies which 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 assure reliable results. Reliable results depends on many factors; Practice D3740 provides a means of evaluating some of those factors.